TGT tormene gas technology
Established in 1907, Tormene Gas Technology is a successful Company that for many years has been dedicating its activity to the design and production of ball valves and Natural Gas Treatment Equipment for industrial, civil and power generation applications, offering a variety of products to give a high degree of customisation, Tormene gas Technology was among the first industrial Companies to address the problem of quality in a wholly innovative manner and was a leader in the implementation of the major process control protocols and to make in roads in the application of instruments and techniques capable of instigating quality rather than simply checking production standards. The Company’s attainment of prestigious certifications underlines a level of overall quality unmatched in the sector: not just extremely high standards of quality and service, but research and innovation in terms of technological and management expertise.
2
Konosphera The KONOSPHERA ball valve design represents the new state of the art in metal seated ball valve technology. This patented design incorporates the major advantages of other metal seated ball valves as well as the advantages of generically different valve designs such as gate and globe valves. These advantages are:
Metal to metal sealing system which provides ZERO LEAKAGE when tested in the normal flow direction.
Torque seating sealing forces are generated by torque, the valve retains the shut-off indipendent of line pressure.
Non rubbing rotation is achieved as a result of the cone in cone rotation system. This concept insures that the ball contacts the seat ONLY at the full closed position thereby eliminating ALL rubbing during the stroke of the valve.
Resilient sealing is obtained by allowing the primary seal member to float on the ball. By properly tailoring the cross sectional area of the seal, it both flexes and compresses during seating thus generating a resilient metallic seal.
Trunnion mounted ball provides a solid and rigid assembly which is suitable for high pressures and temperatures as well as bi-directional shut-off.
Inherently firesafe because there is NO component of the valve which has thermal limit below the temperature required by all of the existing firetest criteria. The KONOSPHERA ball valve provides superior shut-off capability for a longer period of time when used in applications in which soft seated valves are currently used. As a result of its metal to metal sealing system, which does not rub the seal surface during valve travel, the KONOSPHERA valve is relatively unaffected by temperature(including fire), abrasive or cycle frequency. Moreover the KONOSPHERA valve can be manufactured in a Top Entry body style, allowing the removal of both the ball and the valve seat through the top of the valve while the remaining portions of the body remain flanged to the pipe.
3
TGT tormene gas technology
Shut-Off The KONOSPHERA valve, with its resilient all metal sealing system, can meet the same testing requirements of soft seated valves as per API 6D, API 598, BS5351, BS 6755. Although the KONOSPHERA has a preferred flow direction for shut-off, it can be built to meet API 6D, API 598, BS 5351, BS 6755 for pressure in both directions.
Firesafe With an all metal sealing system, the KONOSPHERA ball valve design is not just fire tested or firesafe, it s INHERENTLY FIRESAFE. This means that no components of the valve is detrimentally affected during a fire simulation as defined by API 607, OCMA FSV.1, BS 5351, BS 5146, BS 6755, EXXON BP3.14-1 -2A. The KONOSPHERA design will provide unaffected shutoff capability during and after the fire test criteria.
Non rubbing movement control capability The caming action resulting from the triple eccentricity coneincone seal movement eliminates seal to seal rubbing during the stroke of the valve. This type of ball rotation makes the KONOSPHERA ideal for use as a control valve because the seal and seats are in contact only at the fully closed position. Once the valve begins to open, the seal is away from the seat around the entire circumference of the ball thereby eliminating seal to seat rubbing. By eliminating ball to seat contact, erosion is minimised. Additionally, in applications with solids or abrasive fluids, the seal and seat surfaces are preserved with the non rubbing design.
Trunnion design Some ball valves designs make use of the shaft to provide alignment for the ball thereby subjecting the shaft to torsional and bending loads. The ball on the KONOSPHERA valve is mounted on trunnions both at the top and at the bottom of the ball. On the larger diameter valves the trunnion is independent of the shaft and eliminates all forces on the shaft other than pure torque. This reduces the stresses on the shaft and provides for the highest level of rigidity through the center of the valve which directly relates to valve life expectancy.
4
Seating principle Closed position
The patented geometry of the seal system in the KONOSPHERA is based on a combination of a conical geometry with a triple offset seal together with metallic resiliency. The seal ring is located on the ball, the seat on the body. The centre of the seal is double off set relative to the shaft, provides for a caming action of the seal as it approaches of the seat. The third off set relevent to the seal axis, allows contact without rubbing of the sealing surfaces. The conical surfaces of both the seal and the seat have been so designed that the forces developed between the seal and seat are totally symmetrical around the centre of the seal. These forces are torque generated and impose a uniform compressive load on the seal itself. The seal is not rigidly fixed to the ball but rather retained on it. This allows the seal to have axial freedom of movement. With uniform compressive forces around the circumference of the seal, the seal flexes to assume the exact shape of the seat. With additional torque applied to the shaft, the seal will compress providing resiliency to the system. When the valve is unseated the entire seal surface completely disengages upon rotation and the cams away from the seat. In the open position the seal and the ball are not in contact with the seat which means that all the cavities in the valve body are flushed while the valve is open. The torque characteristics for the opening and closing stroke of the valve are almost identical thereby reducing hysteresis and increasing controlability.
Partially open position
Closed position 22 Sealing ring 21 Renforced ring 18 Ball 17 Retainer 15 Seat
Fully open position
13 Seat body 9 Female body
1 Degree open position 22 Sealing ring 21 Renforced ring 18 Ball 17 Retainer 15 Seat 13 Seat body 9 Female body
5
TGT tormene gas technology
Konosphera No.
Part name
1 2 3 4 *5 6 12 13 * 14 ** 15 * 16 * 17 * 18 * 19 20 21 23 24 25 26 27 28 * 29 30 * 31 * 32 33 34 35 36 37 38 39 * 40 42 43 44 45 46
Female body Ball Trunnion Bearing Screw Sealing ring Lower Flange Trunnion Thrust washer Sealing ring Seat retainer ring Seat Sealing ring Reinforcing ring Sealing ring Retainer Screw Stem Stem bearing Stud bolt Male body Nut Thrust washer Sealing ring Disk spring Gland seal Gland seal Packing follower Stud bolt Screw Gland flange Body pin Key way Seat pin Reinforced ring Nut Gear top flange Packing flange Stud bolt Nut
Two pieces body ANSI 150 - ANSI 2500 Standard material
Full bore
A 105 A 105 ENP STEEL + PTFE A 193 B7 F 316 + GRAPHITE A 105 A 564 T 630 STEEL + PTFE F 316 + GRAPHITE A 105 A 182 F316 + WC F 316 + GRAPHITE F 316 UNS S31803 A 105 NP A 193 B7 A 564 T630 STEEL + PTFE A 193 B7 A 105 A 194 2H STEEL + PTFE F 316 + GRAPHITE 50 Cr V4 FLEX GRAPHITE BRAIDED GRAPHITE A 105 A 193 B7 A 193 B7 A 105 C 60 C 60 C 60 UNS S31803 A 194 2H CARB. STEEL A 105 A 193 B7 A 194 2H
Reduced bore
The parts markeed with ( ) are supplied in the spare parts kit, * recommended as stock. ( ) ANSI 150 to 600 only.
**
6
Two pieces body ANSI 150 - ANSI 2500 - Full bore Weight
Size
ANSI
A
B
C
D
E
F
G
H
I
L
M
N
O
2”
150
191
180
101
-
51
-
260
115
300
38
45
-
59
30
3”
150
216
205
130
-
76
-
260
115
300
38
45
-
59
49
4”
150
241
233
155
-
98
-
260
115
300
38
45
-
59
75
6”
150
406
273
210
-
152
-
300
150
450
47
50
-
80
124
2”
300
232
180
101
-
51
-
260
115
300
38
45
-
59
37
3”
300
299
205
130
-
76
-
260
115
300
38
45
-
59
62
4”
300
321
233
155
-
98
-
260
115
300
38
45
-
59
95
6”
300
419
273
210
-
152
-
300
150
450
47
50
-
80
205
2”
600
295
180
101
-
51
-
260
115
300
38
45
-
59
46
3”
600
432
205
130
-
76
-
260
115
300
38
45
-
59
79
4”
600
559
233
155
-
98
-
260
115
300
38
45
-
59
134
6”
600
660
273
210
-
152
-
300
150
450
47
50
-
80
243
2”
900
372
155
130
-
47
-
260
115
300
38
45
-
59
65
3”
900
384
210
190
-
70
-
260
115
300
38
45
-
59
100
4”
900
460
250
220
-
92
-
300
150
450
47
50
-
80
130
2”
1500
372
155
130
-
47
-
260
115
300
38
45
-
59
65
3”
1500
473
210
190
-
70
-
300
150
450
47
50
-
80
125
4”
1500
549
250
220
-
92
-
300
150
450
47
50
-
80
180
2”
2500
454
155
130
-
47
-
260
115
300
38
45
-
59
110
3”
2500
584
210
190
-
70
-
300
150
450
47
50
-
80
260
4”
2500
683
250
220
-
92
-
450
175
600
50
60
-
100
360
7
Kg
TGT tormene gas technology
Two pieces body ANSI 150 - ANSI 2500 - Reduced bore Size Inch
ANSI
A
B
C
D
E
F
G
H
I
L
M
N
O
3x2
150
216
180
101
76
51
-
260
115
300
38
45
-
59
45
4x3
150
241
205
130
102
76
-
260
115
300
38
45
-
59
58
6x4
150
406
233
155
152
102
-
260
115
300
38
45
-
59
87
8x6
150
470
273
210
203
152
-
300
150
450
47
50
-
80
153
3x2
300
232
180
101
76
51
-
260
115
300
38
45
-
59
55
4x3
300
299
205
130
102
76
-
260
115
300
38
45
-
59
87
6x4
300
321
233
155
152
102
-
260
115
300
38
45
-
59
103
8x6
300
419
273
210
203
152
-
300
150
450
47
50
-
80
230
3x2
600
216
180
101
76
51
-
260
115
300
38
45
-
59
72
4x3
600
241
205
130
102
76
-
260
115
300
38
45
-
59
86
6x4
600
406
233
155
152
102
-
260
115
300
38
45
-
59
149
8x6
600
470
273
210
203
152
-
300
150
450
47
50
-
80
270
3x2
900
384
180
150
70
57
-
260
115
300
38
45
-
59
90
4x3
900
460
210
190
92
70
-
260
115
300
38
45
-
59
130
6x4
900
613
250
220
136
92
-
300
150
450
47
50
-
80
240
3x2
1500
473
180
150
70
57
-
260
115
300
38
45
-
59
115
4x3
1500
549
210
190
92
70
-
300
150
450
47
50
-
80
160
6x4
1500
711
250
220
136
92
-
300
150
450
47
50
-
80
250
3x2
2500
584
180
150
64
54
-
260
115
300
38
45
-
59
190
4x3
2500
683
210
190
89
64
-
300
150
450
47
50
-
80
300
6x4
2500
927
150
220
133
89
-
450
175
600
50
60
-
100
420
8
Weight Kg
Konosphera No.
Part name
1 2 3 4 *5 6 7 8 9 10 * 11 12 13 * 14 * 15 * 16 17 18 19 20 * 21 * 22 23 24 25 26 27 * 28 * 29 * 30 31 32 * 33 34 * 35 36 37 38 39 40 41 42 43 44
Male body Nut Stud bolt Trunnion bearing Sealing ring Thrust washer Lower trunnion Screw Female body Pin Sealing ring Pin Seat body Sealing ring Seat Sealing ring Retainer Ball Screw Screw Reinforcing ring Sealing ring Screw Bearing Stem bearing Top trunnion Screw Sealing ring Gland seal Gland seal Stem Key way Pin Thrust washer Sealing ring Nut Disk spring Gland flange Packing follower Stud bolt Actuator flange Stud bolt Nut Lifting lug
Three pieces body ANSI 150 - ANSI 2500 Standard Material
Full bore
A 105 A 194 2H A 193 B7 STEEL + PTFE F 316 + GRAPHITE STEEL + PTFE A 105 A 193 B7 A 105 C 60 F 316 + GRAPHITE C 60 A 105 F 316 + GRAPHITE A 182 F316 + WC F 316 + GRAPHITE A 105 A 105 ENP A 193 B7 A 193 B7 UNS S31803 UNS S31803 A 193 B7 STEEL + PTFE STEEL + PTFE A 105 A 193 B7 F 316 + GRAPHITE GRAFOIL GRAFOIL A 564 T630 C 60 A 564 T630 STEEL + PTFE BRAIDED GRAPHITE A 194 2H 50 Cr V4 A 105 A 105 A 193 B7 CARB. STEEL A 193 B7 A 193 B7 CARB. STEEL
Reduced bore
The parts markeed with ( ) are supplied in the spare parts kit, recommended as stock. *
9
TGT tormene gas technology
Konosphera
Three pieces body ANSI 150 - ANSI 2500 - Full bore
Size
ANSI
A
B
C
D
E
F
G
H
I
L
M
N
O
Weight
8” 10” 12” 14” 16” 18” 20” 24” 28” 30” 32” 36” 40” 48”
150 150 150 150 150 150 150 150 150 150 150 150 150 150
470 546 622 698 775 876 927 1080 -
230 270 320 345 370 420 502 625 790 830 900 950 1050 1230
205 250 310 330 360 410 480 590 695 780 810 890 950 1160
203 254 305 337 387 438 489 591 686 737 781 876 978 1168
-
-
450 450 420 420 470 470 470 580 580 580 700 700 780 780
175 175 230 230 260 260 260 325 325 325 385 385 430 430
600 600 600 600 600 600 600 600 600 600 600 600 600 600
50 50 100 100 105 105 105 125 125 125 155 155 200 200
60 60 125 125 140 140 140 155 155 155 185 185 215 215
-
100 100 100 100 130 130 130 170 170 170 225 225 260 260
210 380 690 1200 1400 1750 2300 2500 3100 4900 6700 8200 10200 18100
8” 10” 12” 14” 16” 18” 20” 24” 28” 30” 32” 36” 40” 48”
300 300 300 300 300 300 300 300 300 300 300 300 300 300
518 584 664 778 854 930 1010 1165 1372 1422 1553 1756 -
230 270 320 345 370 420 502 625 790 830 900 950 1050 1230
205 250 310 330 360 410 480 590 695 780 810 890 950 1160
203 254 305 337 387 438 489 591 686 737 781 876 978 1168
-
-
450 450 420 420 470 470 470 580 580 580 700 700 780 780
175 175 230 230 260 260 260 325 325 325 385 385 430 430
600 600 600 600 600 600 600 600 600 600 600 600 600 600
50 100 100 105 105 105 125 125 125 155 155 200 200 200
60 125 125 140 140 140 155 155 155 185 185 215 215 215
-
100 100 100 130 130 130 170 170 170 225 225 260 260 260
260 500 750 1290 1600 2050 2500 3000 4510 5750 7400 8900 11200 19100
8” 10” 12” 14” 16” 18” 20” 24” 28” 30” 32” 36” 40” 48”
600 600 600 600 600 600 600 600 600 600 600 600 600 600
664 791 841 892 994 1095 1200 1407 1562 1664 1794 2099 -
230 270 320 345 370 420 502 625 790 830 900 950 1050 1230
205 250 310 330 360 410 480 590 695 780 810 890 950 1160
203 254 305 337 387 438 489 591 686 737 781 876 978 1168
-
-
450 450 420 420 470 470 470 580 580 580 700 700 780 780
175 175 230 230 260 260 260 325 325 325 385 385 430 430
600 600 600 600 600 600 600 600 600 600 600 600 600 600
50 50 100 100 105 105 105 125 125 125 155 155 200 200
60 60 125 125 140 140 140 155 155 155 185 185 215 215
-
100 100 100 100 130 130 130 170 170 170 225 225 260 260
450 740 1090 1750 2340 3290 3700 4300 6000 7590 9100 10600 14400 23900
6” 8” 10” 12” 14” 16” 18” 20” 24”
900 900 900 900 900 900 900 900 900
613 740 841 968 1038 1140 1232 1334 1569
300 310 350 400 450 670 760 890 1010
280 250 280 325 165 640 690 780 900
146 190 238 282 311 356 400 444 533
-
-
450 420 470 470 470 470 580 580 580
175 230 260 260 260 260 325 325 325
600 600 600 600 600 600 600 600 600
50 100 105 105 105 105 125 125 125
60 125 140 140 140 140 155 155 155
-
100 100 130 130 130 130 170 170 170
500 650 1050 1550 2500 3350 4700 6500 9350
6” 8” 10” 12” 14” 16” 18” 20” 24”
1500 1500 1500 1500 1500 1500 1500 1500 1500
711 841 1000 1146 1276 1407 1559 1686 2070
300 310 350 400 450 670 760 890 1010
280 250 180 325 365 640 690 780 900
146 178 22 263 289 330 371 416 498
-
-
450 420 470 470 470 470 580 580 580
175 230 260 260 260 260 325 325 325
600 600 600 600 600 600 600 600 600
50 100 105 105 105 105 125 125 125
60 125 140 140 140 140 155 155 155
-
100 100 130 130 130 130 170 170 170
800 1250 1800 2750 4000 5000 6700 9500 13500
6” 8” 10” 12”
2500 2500 2500 2500
927 1038 1292 1445
270 320 395 450
240 270 150 420
111 146 184 219
-
-
470 470 580 580
260 260 325 325
600 600 600 600
105 105 125 125
140 140 155 155
-
130 130 170 170
820 2225 2980 4250
10
Kg
Three pieces body ANSI 150 - ANSI 2500 - Reduced bore Size Inch 10x 8 12x10 14x12 16x14 18x16 20x16 24x20 28x24 30x24 32x24 36x30 40x36 48x40
Weight
ANSI
A
B
C
D
E
F
G
H
I
L
M
N
O
150 150 150 150 150 150 150 150 150 150 150 150 150
546 622 698 775 876 927 1080 -
390 420 470 500 580 580 502 625 790 830 900 950 1050
270 305 340 370 420 420 480 590 695 780 810 890 950
254 305 337 387 438 489 591 686 737 781 876 978 1168
203 254 305 337 387 387 489 591 686 737 781 876 978
-
401 423 585 585 615 470 470 580 580 580 700 700 780
130 180 208 208 238 260 260 325 325 325 385 385 430
500 500 800 800 800 600 600 600 600 600 600 600 600
80 80 110 110 90 105 105 125 125 125 155 155 200
59 65 95 95 100 140 140 155 155 155 185 185 215
-
129 174 191 191 233 130 130 170 170 170 225 225 260
439 725 1100 1395 1700 1730 1880 2340 3680 5025 6150 7650 13500
10x 8 12x10 14x12 16x14 18x16 20x16 24x20 28x24 30x24 32x24 36x30 40x36 48x40
300 300 300 300 300 300 300 300 300 300 300 300 300
584 664 778 854 930 1010 1165 1372 1422 1553 1756 -
390 420 470 500 580 580 502 625 790 830 900 950 1050
270 305 340 370 420 420 480 590 695 780 810 890 950
254 305 337 387 438 489 591 686 737 781 876 978 1168
203 254 305 337 387 387 489 591 686 737 781 876 978
-
575 615 615 615 650 470 470 580 580 580 700 700 780
155 238 238 238 260 260 260 325 325 325 385 385 430
700 800 800 800 800 600 600 600 600 600 600 600 600
75 90 90 90 125 105 105 125 125 125 155 155 200
80 100 100 100 110 140 140 155 155 155 185 185 215
-
115 233 233 233 261 130 130 170 170 170 225 225 260
455 930 1180 1500 1910 1875 2250 3385 4320 5550 6680 8400 14500
10x 8 12x10 14x12 16x14 18x16 20x16 24x20 28x24 30x24 32x24 36x30 40x36 48x40
600 600 600 600 600 600 600 600 600 600 600 600 600
791 841 892 994 1095 1200 1407 1562 1664 1794 2099 -
410 450 510 550 640 640 502 625 790 830 900 950 1050
291 140 180 420 480 480 480 590 695 780 810 890 950
254 305 337 387 438 489 591 686 737 781 876 978 1168
203 254 305 337 387 438 489 591 686 737 781 876 978
-
615 650 650 712 712 470 470 580 580 580 700 700 780
238 260 260 290 290 260 260 325 325 325 385 385 430
800 800 800 800 800 600 600 600 600 600 600 600 600
90 125 125 135 135 105 105 125 125 125 155 155 200
100 110 110 135 135 140 140 155 155 155 185 185 215
-
233 261 261 300 300 130 130 170 170 170 225 225 260
900 1410 1850 2550 3250 2780 3225 4500 5700 6900 7950 10800 18000
8x6 10x 8 12x10 14x12 16x14 18x16 20x18 24x20
900 900 900 900 900 900 900 900
740 841 968 1038 1140 1232 1334 1569
310 310 350 400 450 670 760 890
250 250 280 325 365 640 690 780
190 190 238 282 311 356 400 444
238 282 311 356 400 444 533
-
450 420 470 470 470 470 580 580
175 230 260 260 260 260 325 325
600 600 600 600 600 600 600 600
50 100 105 105 105 105 125 125
60 125 140 140 140 140 155 155
-
100 100 130 130 130 130 170 170
650 790 1200 1890 2550 3600 4900 7020
6x4 8x6 10x 8 12x10 14x12 16x14 18x16 20x18
1500 1500 1500 1500 1500 1500 1500 1500
841 1000 1146 1276 1407 1559 1686 2070
310 310 350 400 450 670 760 890
250 250 180 325 365 640 690 780
178 190 228 263 389 330 371 416
228 263 289 330 371 416 498
-
450 420 470 470 470 470 580 580
175 230 260 260 260 260 325 325
600 600 600 600 600 600 600 600
50 100 105 105 105 105 125 125
60 125 140 140 140 140 155 155
-
100 100 130 130 130 130 170 170
1200 1350 2063 3000 3750 5025 7150 10200
8x6 10x 8 12x10
2500 2500 2500
1038 1292 1445
270 310 395
240 270 350
111 146 184
146 184 219
-
470 470 580
260 260 325
600 600 600
105 105 125
140 140 155
-
130 130 170
1690 2235 3190
11
Kg
A Long Experience in Energy Equipment and one Goal: T h e C u s t o m e r ’s s a t i s fa c t i o n .
Padova Plant.
TGT TGT - TORMENE GAS TECHNOLOGY S.p.A. Via Campolongo, 97 - 35020 Due Carrare (PD) - Italy Phone: +39 049 9199611 - Telefax:+39 049 9125455 E-mail: info.tormene@valvitalia.com Web site: www.valvitalia.com
11.06 - 1000 - TGT.KONOS.03
tormene gas technology
E N E R G Y
VALVITALIA reserves the right to change design, specification and materials without notice
2
N E E D
S
C O N T R O L CONTENTS Globe Control Valves LTG1 LTG2 LTG3 LTG4 LTG5 RV631
4 4 6 8 9 18
Tree-way Control Valves TRV1 TRV2
10 10
Rotary Control Valves DYNA-LOK K-LO CB-54 CB-55
12 14 16 16
Steam Conditioning Control Valves PRDV SAN nozzles
20 22
3
VALVITALIA reserves the right to change design, specification and materials without notice
E N E R G Y
N E E D
LTG1 and LTG2 Control Valves Globe straight-way, single seat LTG1 and LTG2 series are very versatile control valves of general use for any applications under moderate p/T service conditions. LTG1 is the standard design with screwed seat ring while LTG2 is the corresponding quick-change version with the same flow coefficients and pressure differentials capability. Due to their simple construction and to their large range of available materials these valves are suitable for a wide range of applications, such asr corrosive, dirty, sticking and slightly abrasive fluids. Angle-body LTA special design is also available with the same trims of LTG series.
Main advantages:
● ● ● ●
Excellent plug stability provided by heavy top guiding design Interchangeable low noise and anticavitation trim either for std or quick-change design Tight shut-off class V and VI also available Wide flow range capability is allowed by a great number of reduced capacity trims
LTG2 ANSI 300 Diaphgram Actuator
Technical characteristics: Body:
● ● ● ● ● ● ● ●
Bonnet:
● ● ● ● ●
Trim:
● ● ●
Packing:
●
Sizes: 3/4”, 1”, 1”1/2, 2”, 3”, 4”, 6” Ratings: up to ANSI 600 /PN100 Flanged, butt-welded, SW, and threaded Cast construction, also wrought or by bar for smaller dimensions Face-to-face dimensions as per IEC 60534 –3-1 materials: carbon, Cr-Mo and AISI 316 stainless steel Flow direction: – to open. – to close for some flashing applications Materials: Carbon, Cr-Mo and Stainless Steels Bolted to body Extended for high and low temperatures Bellows seal Special design for cryogenic applications Same materials as body Top guided plug both in LTG1 and LTG2 constructions Linear, modified linear and Eq% flow characteristics Plug types: – contoured – flat disc for quick opening operation – skirted and drilled BRD design (linear characteristic) for special services – soft seat - only for contoured and flat disc
●
Adjustable by nuts and follower Seal rings: reinforced braided teflon or pure graphite split-rings Bellows seal
Rangeability:
●
Cvmax / Cvmin better than 50:1 for 1" port and over
Cage (LTG2 only):
●
Seat ring clamped into the body by the cage for quick-change feature Large windows of cage do not affect the inherent flow characteristic (including max Cv) of LTG1 corresponding trims
●
●
VALVITALIA reserves the right to change design, specification and materials without notice
4
S
C O N T R O L
Seat Ring:
●
Threaded in LTG1 model and clamped-in in LTG2 model
Leakage Class (IEC 60534-4) :
●
Standard: class IV Optional: class V and VI
Actuators:
●
●
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Pneumatic diaphragm or Piston type Electric and Electro-Hydraulic actuators
LTA design Globe types LTG1 and LTG2 are also available with angle body. In this case they are designated as LTA1 and LTA2 Control Valves. LTA series are special engineered designs. The advantages provided by LTA series are the following: 1 - Different dimensions for valve inlet and outlet are available 2 - Inlet and outlet ratings can also be different 3 - Centre-to-face dimensions consistent with IEC standard when the connections have the same dimensions 4 - Increased Cv values in comparison with LTG1 and LTG2 standard body style due to less pressure drop of angle path 5 - Trims, characteristics, material and actuators are the same of standard LTG series
LTG1 ANSI 600 Electric Actuator
LTA Control Valve Standard contoured plug
LTG1 Std contoured plug
BRD trim
Soft seated plug
LTG2 Std contoured plug
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VALVITALIA reserves the right to change design, specification and materials without notice
E N E R G Y
N E E D
LTG3 Cage Control Valves Globe straight-way LTG3 series is a very versatile control valve for the main applications. Its high performance derives by using a balanced and cage-guided plug. LTG3 is particularly suitable for heavy duties and for any other application under most demanding service conditions. Due to their simple construction, to the large range of trim types and available materials, these valves are suitable for a wide range of applications, including also high temperature and corrosive fluids, severe low-noise requirements and sour service in accordance with NACE standard.
Main advantages:
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High pressure drop capability with no practical limitations Improved plug stability due to large guiding areas Wide-range capability is allowed by a great number of reduced capacity trims Excellent noise attenuation with low-noise single-stage trim for gas and steam service Improved cavitation protection on liquid services Multistage trims also available for cavitation control. Balanced plug construction reduces thrust and actuator sizes Piloted plug construction for tight shut-off up to class V in high temperature services
LTG3 20” ANSI 900
LTA design LTG3 are also available with angle body. In this case they are designated as LTA3 Control Valves. LTA series are special engineered designs. The advantages provided by LTA design are the same of LTA1 series.
Technical characteristics: Body:
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Bonnet:
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Trim:
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Cage:
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Sizes: 2", 3", 4", 6", 8", 10", 12", 14", 16", 18", 20" Ratings: up to ANSI 150, 300, 600, 900, 1500, 2500 and equivalent PN Flanged, butt-welded, socket-welded and threaded Cast standard construction; wrought or bar for 2" and 3" sizes Face-to-face dimensions as per IEC 60534-3-2 - long series materials: carbon, Cr-Mo and AISI 316 stainless steel Flow direction: – to open - general feature – to close - for piloted plugs and some flashing services Materials: Carbon, Cr-Mo and Stainless Steels Standard or extended type either for high or low temperature applications Bolted to body Same materials as body Balanced and fully cage-guided plug Unbalanced design for small ports or low pressure drop applications Piloted design for tight shut-off associated to high fluid temperature Plug seal rings: PTFE, metal or metal and graphite Low-noise drilled cage single stage LN and special ELN type with additional acoustical benefit of 4 dB. MPS multistage trim special design for high pressure drops Multi-cage construction up to 6 stages. 7 stages and over are obtained from a solid disk stack Linear and equal% characteristics for standard trim design
VALVITALIA reserves the right to change design, specification and materials without notice
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LTG3 balanced plug
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C O N T R O L
Seat Ring:
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Quick-change and free-expanding type, precisely coupled to the cage to ensure a perfect plug alignment
Leakage Class:
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Classes III, IV, IV S1 and V according to IEC 60534-4 Class VI is also available with soft-seat
Actuators:
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Pneumatic diaphragm or Piston type Electric and Electro-Hydraulic actuators
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Single stage Low noise cage
MPS trim balanced plug
LTG3 plug with soft insert
Low noise cage construction
Linear characterized LTG3 cages
MPS multistage trim
LTG3 - cage assembling
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Double stage balanced plug
LTG3 - control valve under cryogenic test VALVITALIA reserves the right to change design, specification and materials without notice
E N E R G Y
N E E D
LTG4 Series Control Valves Globe straight-way LTG4 Series Control Valves have the same body, bonnet and seat ring of LTG3 series. The main difference is the design of the plug which is balanced type and contoured shaped for the throttling function. The cage, provided with large windows, clamps the seat ring against the body and acts also as the integral guide of the plug. The trim is of quick change type for an easy maintenance. These valves combine the benefits of plug balancing and quick-change feature of LTG3 series with the simple and versatile construction of contoured plug which allows a wide selection of materials, coatings and flow characteristics. Also dirty, abrasive and very corrosive fluids can be successfully handled without the inconvenient sometime occurring in conventional throttling cage valves. The limitations about low-noise and anticavitation characteristics are compensated by the free-passage shape of the plug with reduced risk of local erosionand clogging.
Technical characteristics: Body:
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Bonnet:
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Trim:
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LTG4 10” ANSI 2500
Flanged, butt-welded Cast std construction; also wrought or bar construction for 2" and 3" sizes Face-to-face dimensions as per IEC 60534-3-1 long series Sizes: 2", 3", 4", 6", 8", 10", 12", ratings up to ANSI 150, 300, 600, 900, 1500, 2500 Materials: Carbon, Cr-Mo and Stainless Steels materials: carbon, Cr-Mo and AISI 316 stainless steel Flow direction: to open Bolted joint to body Extended type either for high and low temperature applications as a standard feature Same materials as body Balanced and fully guided plug Seal rings for leakage classes IV and better: metal, teflon, metal and graphite Linear and equi% up to 2” port included - modified linear for higher sizes Plug types: – contoured – flat disc for quick opening operation – soft seat – soft seat – cascade trim
Seat Ring:
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Quick-change and free-expanding type, precisely coupled with the cage to ensure a perfect plug alignment
Leakage Class:
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Classes III, IV, IV S1 and V according to IEC 60534-4 Class VI is also available with soft-seat plug
Actuators:
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Piston or pneumatic diaphragm spring return Electric actuators on request
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Cascade trim Represents one of the most valid systems to reduce erosion and cavitation and it finds wide applications in small size valves, whether other “multistep” solutions can not be used. The pressure drop is equally splitted through a lot of labyrinth paths specially machined inside the trim itself. Control valves equipped with “cascade trim” can operate under very high pressure drops with a longer working life compared to standard single stage trims. Two separate sealing surfaces can be provided: by this way the first seal, between seat and cage, acts as a sacrifice element. VALVITALIA reserves the right to change design, specification and materials without notice
LTG4 - cascade trim
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LTG5 Series Control Valves LTG5 Series top guided control valves are specially designed for the control of particular fluids where dead zones inside the valve body are not tolerated due to risk of crystallization, local corrosion, scaling or seizure. These features pertain to top guided LTG1 series, but a different plug-to-stem solid construction is performed in LTG5 valve to avoid any residual areas where fluids can stagnate. Particular care is paid to the packing zone where stagnation of fluid could cause stem corrosion, wear and leaks. Cv and other sizing factors are the same of LTG1 series. Typical applications of these valves are: ● ● ●
Food industry and drinking water Pharmaceutical processes Urea, melamine and similar plants
Main features: 1 - No dead zones inside the body with reduced contamination and erosion 2 - Stem-to-plug solid design which: – avoids dead zones inside the bonnet including packing box chamber – avoids coupling stem–to–plug which can be affected by local corrosion and consequent loosening – provides an excellent alignment between stem and plug with benefit for the packing tightness – increases trim stiffness due to oversized stem diameters 3 - reduced distance from packing to body inside cavity keeps the packing temperature very close to that of internal fluid so to prevent solidification inside the packing
LTG5 high pressure lug body type for urea service
Technical characteristics: Body:
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Bonnet:
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Trim:
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Flanged and butt-welded connections –also plug type is available Cast construction – also wrought or by bar for small dimensions Face-to-face dimensions as per IEC 60534-3-1 long series Sizes: 3/4”, 1”, 1”1/2, 2”, 3”, 4”, 6” Ratings up to ANSI 600 – ANSI 1500 for sizes up to 2” included Materials: carbon, Cr-Mo, AISI 316, AISI 316L, duplex, hastelloy for sizes up to 3” – other on request Flow direction: – to open – to close only for balanced plug Flanged to body Same materials as body seal rings: reinforced braided Teflon or pure graphite Top guided unbalanced plug – integral with stem Guide: an extra-long bush fitted into the bonnet Flow characteristic: linear and equi% up to 2” port included modified linear for higher sizes Type of plug: contoured or flat for quick opening operation Soft seat: teflon insert fitted into the plug seat ring: threaded in std design – also welded-in or integral for high corrosive services
Materials:
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Inox, hastelloy, duplex, HVD1, other alloys and coatings on request and when necessary
Leakage Class:
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Std IV – optional V or VI
Actuators:
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Pneumatic diaphragm or piston types Electric and electro-hydraulic on request
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VALVITALIA reserves the right to change design, specification and materials without notice
E N E R G Y
N E E D
TRV1 and TRV2 3-way Control Valves TRV control valves series are especially designed for heat exchangers control where the flow rate of the heating fluid which enters the heat exchanger is changed by the temperature controller. As outlined in the sketches of Fig.1 and 2 both the two methods used for this process switch-off the flow rate into a by-pass line around the exchanger. In the layout of Fig.1 the valve is the diverting type TRV1 with one inlet and two outlets while in the arrangement of Fig 2 the valve is the mixing type TRV2 with two inlets from heat exchanger and by-pass. The use of the by-pass around the exchanger limits the changes of pressure in the main line with many benefits for the assisted final equipment (boilers, headers, etc.).
Fig.1 – DIVERTING TYPE 3-way control valve in heat exchanger application
Fig.2 – Mixing type 3-way control valve in heat exchanger application
TRV Design In both designs the fluid tends to open the plug to ensure the max stability to the valve operation. The selection between the two solutions is basedprincipally on fluid temperature and on the differential temperature T1-T2 across the exchanger. TRV1 diverting type is generally preferred for high ⌬T(120° and over) but when T1 exceeds 350°C (up to 450°C) mixing type TRV2 is preferred. Generally, mixing type is preferred as it is less expensive and due to easier maintenance.
Technical characteristics: Body:
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Bonnet:
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Trim:
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Sizes: from 1" up to 12" Ratings: up to ANSI 150, 300, 600 900 and 1500 on request Flanged connections Cast standard construction; wrought or bar construction also available for small sizes Flow direction: see sketckes Materials: carbon, Cr-Mo and stainless steels Plain or extended type either for high or low temperature applications as a standard feature Bolted to body Same materials as body Intrinsically balanced in heat exhanger application Plug is available in two design: standard and low-noise TRV2 Control Valve 12” ANSI 600 (mixing type)
VALVITALIA reserves the right to change design, specification and materials without notice
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VALVITALIA reserves the right to change design, specification and materials without notice
E N E R G Y
N E E D
DYNA-LOK rotary Control Valves DYNA-LOK rotary control valves are provided with a double eccentric disc and a very easy-to-be changed TFE based or metal seat ring. Thanks to DYNA-LOK disc off-set design, the torque tending to close the valve and, more in general the torque needed to control the disc rotation is sensitively reduced. In addition, the cam effect performed by second shaft eccentricity guarantees a seal ring longer life. These valves can offer a great flow control with an excellent shut-off withstanding also very high pressure drops, independently of the flow direction.
Technical characteristics: Body:
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Disc:
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Shaft:
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Bearings:
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Sizes:
wafer and lug body design: from DN 150 up to DN 2000 flanged body: from DN 250 up to DN 2000 Ratings: up to ANSI 300, PN 40 up to DN 600 included, ANSI 150, PN16 for greater sizes For water mains DYNA-LOK control valves can be supplied in accordance with AWWA std ratings and connections Cast or fabricated construction depending on body style, size and material selection Face-to-face dimensions as per EN 558, IEC 60534-3-1, ISO 5752 Materials: all carbon and stainless steel grades, duplex and copper alloys Double eccentric design when tightness in closed position is requested Full-bore swing-through construction with single off-set disc when no tightness is requested in closed position Solid or whrougt cast construction Bi-directional flow but inlet on flat disc side gives better performance Flow characteristic: increasing gain up to approx. 50° opening, linear from 45° to max travel Materials: same as the body Constructions: one or two pieces depending on sizes Connection to the disc: by pins protected by set screws External sealing: single stuffing box actuator side Packing materials: teflon or graphite seal rings Materials: stainless steels, 17-4-PH, XM19 Radial bearings: Teflon-based compounds embedded in SS bushing. Over-sized bearings (total length = 3,5 x ⌽) allow a smooth rotation and a long maintenance-free valve life Axial bearings: axial thrusts are held by a couple of anti-friction washers
High pressure DYNA-LOK control valve with PRA actuator
Seat Ring:
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Two designs are available to fulfil different temperature conditions: – spring-energized Teflon ring for temperatures up to 200°C – SS ring for higher temperatures Both seal rings are locked inside the body by means of an easily removable spacer.
Leakage Class:
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Teflon seal ring assembly is consistent with class V (IEC 60534-4) for sizes up to 20”. For higher dimensions IVS1 class or better depending on actuator For metal SS type IVS1 class is allowed for all sizes
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Actuators:
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VALVITALIA reserves the right to change design, specification and materials without notice
Valvitalia DRA pneumatic diaphragm actuator for valve sizes up to 16” Valvitalia PRA piston types actuators with low friction scotch-yoke mechanism for larger valve sizes Pneumatic rack and pinion both single and double acting for sizes up 24” included Electric, electro-hydraulic and hydraulic actuators for heavy duties control purpose
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C O N T R O L The requested torque to move the disc of a DYNA-LOK valve is mainly depending on the differential pressure across the disc and on the values of pressures inside the body. The ⌬p increases friction of seal ring and shaft bearings in closed position, while, in opened position, it creates a dynamic force due to a not balanced distribution of pressures acting on the disc. DYNA-LOK disc design limits very much this second well-known effect especially in the usual working travel range from 40° to 90°.
32” DYNA-LOK control valve - lug body construction
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VALVITALIA reserves the right to change design, specification and materials without notice
E N E R G Y
N E E D
K-LO high-performance Rotary Control Valves K-LO rotary control valves have been especially designed to meet the usual cavitation problems of processes when hot liquids and not negligible pressure drops facilitate the development of cavitation. These special valves are deriving from the double eccentric DYNA-LOK series by modifying the basic disc design with particular baffles, integral or welded-in on both the disc sides, which increase the recovery factor of valve as well as its cavitation index grows. These baffles are wing-shaped and machined with many rectangular windows providing a moderate pressure drop so to not greatly affect the Cv of the valve with the plain disc. The distribution of the windows takes into account the presence of the sealing ring fitted into the body, with particular care to the area close to the shaft axis. Due to particular disc baffled design, max valve openings greater than the usual 90° are allowed to achieve higher Cv values. As for DYNA-LOK valves, the off-set design reduces the torque tending to close the valve. In addition, the cam effect caused by second shaft eccentricity improves the seal ring life.
Technical characteristics: Body:
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Disc:
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Shaft:
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Bearings:
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Sizes: from DN 250 up to DN 2000 Ratings: up to ANSI 300, PN 40, up to DN 600 included, ANSI 150, PN16 for greater sizes. Flanged design (cast or fabricated construction depending on the size and material selection) Face-to-face dimensions as per EN558, ISO 5752, basic series 13 Materials: all carbon and stainless steel grades, duplex and copper alloys Double eccentric design when tightness in closed position is requested Two disc designs are available: drilled wings for low noise services and multi-windows wings for anticavitating service Full-bore swing-through contruction with single off-set disc when no sealing device is requested in closed position Both sides flow directions. Best leakage performance is assured by flow on flat disc side Opening up to 100° High xFZ cavitation index values Flow characteristic: increasing gain up to approx. 50° opening, linear from 50° to max travel Materials: same as the body Constructions: one and two pieces depending on sizes Connection to the disc: by pins protected by screws External sealing: single stuffing box actuator side Packing materials: teflon or graphite seal rings Materials: stainless steels, 17-4-PH, XM19 Radial bearings: Teflon-based compounds embedded in SS bushing. The oversizing of these bearings (tot. length = 3,5 x ⌽) allows a smooth rotation and a long maintenance-free valve life allow a smooth rotation and a long maintenance-free valve life Axial bearings: axial thrusts are held by a couple of anti-friction washers
Seat Ring:
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Two designs are available to fulfil different temperature conditions: – spring-energized Teflon ring for temperatures up to 200°C – SS ring for higher temperatures Both seal rings are locked inside the body by means of an easily removable spacer
Leakage Class:
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Teflon seal ring assembly is consistent with class V (IEC 60534-4) for sizes up to 20”. For higher dimensions IVS1 class or better depending on actuator For metal SS type IVS1 class is allowed for all sizes
Actuators:
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Valvitalia DRA pneumatic diaphragm actuator for valve sizes up to 16” Valvitalia PRA piston types actuators with low friction scotch-yoke mechanism for higher valve sizes Pneumatic rack and pinion both single and double acting for sizes up 24” included Electric and hydraulic actuators available on request
VALVITALIA reserves the right to change design, specification and materials without notice
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C O N T R O L
Cavitation and noise control Multi windows wings These special trim executions are machined, depending on wings size, from a solid cast or forged block. The design of K-LO disc is very effective against potential cavitating conditions due to its high xFZ values, which are close to 0,4 at 70째 opening approximately for all the dimensions. This allows to avoid cavitation under critical conditions, such as, for example: p1 = 15 bar, p2 = 10 bar and max vapour pressure = 2,5 bar (water at 125째C). Flow coefficients are slightly affected by the anti-cavitation large windows of the wings, while allowed disc opening is limited to the region where recovery factor is higher.
Drilled wings Special drilled wings allow K-LO control valve to reduce noise. This peculiar trim pattern combines high efficiency in reducing noise with an excellent modulating performance.
Low-noise disc design
Anti-cavitation disc design
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VALVITALIA reserves the right to change design, specification and materials without notice
E N E R G Y
N E E D
CB54 – CB55 Ball Control Valves Control Ball Valves of CB series provide an excellent tightness, typical of on-off ball valves with a high rangeability. CB series valves match together the ability to transfer large flows with a precise regulating action at small flows. In this way it is possible to reach reangeability of 200:1 and with particular trims until 300:1. Furthermore the special trim design of CB series provides noise and cavitation abatement. CB series are available in two configurations: 1. CB 54 has a downstream drilled disc especially engineered to reduce aerodynamic noise 2. CB 55 special multi-path / multi-stage trim allows an excellent flow control, and it is especially designed to reduce both noise and cavitation effects.
Technical characteristics: Body:
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Ball:
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Shaft:
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Bearings:
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Seat:
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Actuators:
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Side entry flanged and butt-welded design Size: from 2” to 42” Rating: from #150 to #2500 Face to face dimensions API 6D Materials: carbon and stainless steel, duplex, nickel alloys CB 55 series with integral trim up to 4” With removable trim for 6” and over Soft / metal to metal seat Flow direction: – unidirectional: CB 54 – bidirectional: CB 55 Materials: same as body
CB54 drilled disc view
Anti blow-out design Quick changing shaft packing Materials: stainless steel, A564 T630, A479 XM19 Packing: teflon or graphite ring Radial bearings: generous sizing of these bearings allows a smooth rotation and a maintenance-free long life Axial bearings: thrust due to internal pressure is held from an antifriction washer Spring energized, double-effect piston construction on request Soft / metal to metal seat Pneumatic low friction skotch-yoke PRA type DRA pneumatic diaphragm type Electric, hydraulic, electro-hydraulic CB54 gas plant installation
Leakage Class:
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Classes IV, IV S1 and V according to IEC 60534-4, Class VI is also available with soft-seat
VALVITALIA reserves the right to change design, specification and materials without notice
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CB54
CB55 sectional view
CB55
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VALVITALIA reserves the right to change design, specification and materials without notice
E N E R G Y
N E E D
RV631 series Control Valves RV631 control valves have their main application in boiler feedwater process, They are expressly designed for processes that require low pressure drops when the flow rate is high and the need to avoid cavitation when flow rate is small. The special design of its cage, splitted in 3 steps along the travel, allows the RV631 trim to meet these process requests. During the first travel section, in which high pressure drops might generate cavitation phenomena, the process is controlled by a properly designed multistep cage, which causes the fluid to pass through six pressure reduction stages: in this way any vaporization is avoided. The last section has a final single stage cage with large flow passages which ensures the maximum flow rate with moderate pressure drop. Each section of the cage, welded together to form a solid rugged unit, is separated by lips that prevent the fluid passage between adiacent sections.
Technical characteristics: RV631 Control Valve
Body:
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Bonnet:
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Trim:
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Cage:
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●
Sizes: 3”, 4”, 6”, 8”, 10”, 12” Ratings: ANSI 150, 300, 600, 900, 1500 Flanged, BW, SW Cast standard construction Face-to-face dimensions as per IEC 60534-3-2 Flow direction: to open Materials: Carbon, Cr-Mo and stainless steels Bolted to body Same material as body Flow direction: to open Packing materials: teflon or graphite seal rings Materials: Carbon, Cr-Mo and stainless steels Balanced and fully cage-guided plug Unbalanced design for small ports or moderate pressure drop applications Plug seal rings: PTFE, metal or metal and graphite Flow characteristic: modified linear (see diagram) Variable resistance along the travel: 6-stages for low openings, 3-stages for intermediate travel and single-stage at full opening. Different arrangements of stages distribution can be performed to fulfil special applications
Seat ring:
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Quick-change and free-expanding type, precisely coupled with the cage to ensure a perfect plug alignment
Leakage Class:
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Classes IV, IV S1 and V according to IEC 60534-4
Actuators:
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Pneumatic diaphragm or piston type Electric and electro-hydraulic actuators
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6-stage multistep cage detail VALVITALIA reserves the right to change design, specification and materials without notice
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RV631 3-step cage
Last cage section with single-stage and high specific CV Intermeditate section with 3-stage and increased specific CV 6-stage first anti-cavitation section
CV and XFZ vs travel
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VALVITALIA reserves the right to change design, specification and materials without notice
E N E R G Y
N E E D
PRDV steam conditioning Control Valves PRDV control valve is a very efficient and compact equipment for steam conditioning either in turbine by-pass lines discharging to condenser or in cogeration processes (see included layout). Conditioning includes pressure reduction and integrated desuperheating devices. Pressure reduction is obtained through three stages, except in LP applications where two stages are adequate to provide good performance and noise limitation. The first stage is the throttling section where flow rate is adjusted by the change of plug position inside a drilled cage. The second stage is a fixed resistance performed by a drilled basket, which creates a backpressure on the seat in order to reduce its velocity head and the generated noise. The third stage has a patented cone-shaped special designed drilled ring wich contributes to noise reduction and improves the mixing of steam with the downstream injected water. Shape and orientation of this ring optimize the steam impact against the external surface of sprayed water pattern, where the biggest water drops tend to reunite and to improve the atomizing efficiency of the equipment as a whole. Desuperheating section consists of a chamber installed downstream the third stage where some spring-assisted nozzles are mounted. Great care is taken to avoid any risk of thermal shocks, including a jacketing of internal surface of injection chamber which is recommended for high pressure sytems and whenever steam inlet temperature exceeds 500°C. PRDV Control Valve (patented design)
Technical characteristics: ●
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Sizes: sizes depending on service conditions Ratings: inlet section up to ANSI 2500. Outlet section up to ANSI 900 included Construction: from bar stock or forgings. Inlet connnection and injection chamber are welded to main body section Pressure seal design for inlet ratings over ANSI 900 Materials: carbon steel or Cr-Mo steels, F91 (9%Cr) depending on service conditions
Plug:
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Unbalanced or balanced with seal rings and pilot assisted depending on service conditions
Seat Ring:
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Welded-in by a double lip-seal joint which grants against thermal distortions and allows an easy removal from the body
Leakage Class:
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Unbalanced and pilot assisted plug: class V (as to IEC 60534-4) Balanced plug with seal ring: class IVS1
Actuators:
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Double effect, spring-assisted Valvitalia LPA pneumatic piston actuators are commonly used Electric, electro-hydraulic and hydraulic actuators for heavy duties control application
Body and Bonnet:
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Materials:
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Trim: stellited or nitrided F6NM alloy steel and AISI 422 (1-4935) 17-4-PH is used for inlet temperature up to 375°C Stem: AISI 316 or XM19 depending on service conditions Packing: pure graphite seal rings Pressure seal ring: low hardness AISI 316 PRDV Control Valve section
VALVITALIA reserves the right to change design, specification and materials without notice
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C O N T R O L Sizing and noise prediction Standard well-known sizing equations (IEC 60534-2-1) are notapplicable to PRDV control valves as a whole due to the fixed area devices assembled downstream the throttling stage. For this reason, all the stages are separately sized according to IEC equations and the selection of the whole valve is performed for each specific application. The accuracy of the combination of calculated Cv is guaranteed by the Valvitalia’s deep knowledge and large experience on this matter. The total Cv of PRDV, including all downstream devices (fixed resistances), is not useful for selecting the valve. In limit flow conditions, where flow rate does not depend on downstream pressure, the effective Cv value for predicting the flow rate is the same of first stage. The sizing of 2nd and 3rd stage is based on the assumption that full pressure recovery occurs between the stages so to allow a complete fluid reheat after the restrictions. However, unexpected errors on fixed resistances sizing do not affect the flow rate passing through the valve as long as limit conditions are held on first stage. To predict noise generated by PRDV control valves the basic principles of IEC 605434-8-3 standard are taken into account. Both cone shaping of 3rd stage and the optimized steam/water mixing do contribute to the reduction of acoustic power transmitted downstream (IEC rw factor). The overall PRDV noise calculation is made by a proprietary VALVITALIA method based on the most advanced studies supported by on-line verifications.
Steam conditioning PRDV valves in a combined cycle process plant
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PRDV preheating layout – circulation type VALVITALIA reserves the right to change design, specification and materials without notice
E N E R G Y
N E E D
SAN series desuperheating nozzles SAN NOZZLES are variable area spring-assisted nozzles for desuperheating service. The closed position of the plug (51) is assured by the action of a calibrated spring (53) loaded by a threaded nut (52) locked in position by a pin (54). When the water pressure inside the nozzle rises, the âŒŹp between steam and water increases till the water action on the plug exceeds the spring load and the plug starts opening. The water starts to come out from the nozzle flowing through several holes that, due to their special design, whirl the flow before it gets in contact with the inside surface of the plug. The plug perfectly atomizes the water performing a 90 degrees-shaped conical blade. The special plug profile on the external surface which is in contact with steam flow improves plug stability in open position. Spring load can be adjusted to obtain the desired opening pressure. 1,3 and 5 bar are our standard settings. Other set pressure values can be provided for special requirements.
Materials: SAN body materials are carbon steel or Cr-Mo steel according to operating temperature. INCONEL X-750 has been selected for springs to ensure maximum stability at highest temperatures. Injection chamber is normally manufactured with the same pipe material.
SAN 5 nozzle VALVITALIA reserves the right to change design, specification and materials without notice
SAN nozzle spray pattern
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C O N T R O L
SAN nozzle rear view
Spring settings for SAN nozzles
SAN series
SAN Desuperheater Mounting
Side-pipe mounting
Probe mounting
One or more SAN desuperheater can be fastened at the end on a tubular element flanged or welded to the pipe. The spray is performed close to the pipeaxis by selecting the probe lenght. A reference pin located on the desuperheater flange ensures the correct orientation of the nozzle inside the piping.
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VALVITALIA reserves the right to change design, specification and materials without notice
A Long Experience in Energy Equipment and one Goal: T h e C u s t o m e r ’s s a t i s fa c t i o n .
Padova Plant.
Via Campolongo, 97 - 35020 Due Carrare (PD) - Italy Phone: +39.049.9199611 - Fax: +39.049.9125455 E-mail: info.controlvalves@valvitalia.com Web site: www.valvitalia.com
12.09 - 1000 - CVD.02
VALVITALIA S.p.A. - Control Valves Division