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Safety Relief Valve RMG 850

Product information

serving the gas industry worldwide

Safety Relief Valve RMG 850 Application, characteristics, technical data

Application • for offtake stations in gas transmission systems, for gas supply to industrial and power plants • suitable for full capacity relief • for natural gas and all non-corrosive gaseous media Characteristics

2

• in-line flow • can be installed in any position • safe operation • high response accuracy • quick reaction • can be provided with a noise reducing outlet duct module RMG 512 as an optional feature

technical data max. service pressure pmax

100 bar adjusting range Wds

max. permissible service pressure

(bar) adjusting ranges with measuring unit RMG 670

(bar)

2,00 ... 5,00 2,00 ... 10,0 5,00 ... 20,0 10,0 ... 40,0 20,0 ... 90,0* DN 25 DN 50 DN 80 DN 100

sizes/flow rate coefficients (KG-value for natural gases, ρn = 0,83 kg/m)

40 40 40 50 100 KG-value KG-value KG-value KG-value

500 m3/h 2000 m3/h 5100 m3/h 8000 m3/h

valve seat diameter

equals nominal width of inlet connection

connections

flanged to DIN PN 25, PN 40 and to ANSI 300, ANSI 600

materials

main valve body internal parts measuring unit diaphragm sealings

Temperature range

-15° C to +60° C

function and strength

acc. to DIN 3381

DIN-DVGW-registration No.

DN 25 DN 50 DN 80 DN 100

*) with metal harmonica type measuring unit

closing pressure

cast steel, steel steel, aluminium, brass aluminium alloy, steel rubber-like plastic material (NBR, FPM) rubber-like plastic material

89.01e042 89.02e042 89.03e042 89.04e042

(bar) 0,5 0,6 1,0 1,5 2,0

Safety Relief Valve RMG 850 Design and operation

The safety relief valve RMG 850 was designed to open automatically, as soon as the pressure of the system to be protected and monitored comes up to the pre-adjusted setpoint.

The safety relief valve consists of a main valve and a measuring unit. The main valve consists of the control element and the piston assembly as a complete modular unit. A filter is provided upstream to protect the measuring unit and the bleed bore from contamination.

The control element consists of a movable sleeve and a valve cone fixed into the body. The advantage of this design is that the gas passes straight through without any diversion, thus exerting forces in axial direction only.

The movable sleeve is - to a large extent - pressure compensated, so that changes of service pressure does not tell upon the response precision of the valve.

The piston assembly has a fixed connection to the valve sleeve of the control element. The chambers above and below the piston are interconnected through a bleed bore so that in the basic position both chambers are exposed to the same pressure and the valve is kept closed by the force of the closing spring.

The high response accuracy of the safety relief valve is due to the fact that the measuring unit is equipped with a sensitive double diaphragm system with the amplifying valve placed between the diaphragms.

The pressure to be monitored is fed to the lower side of the double diaphragm system through the measuring impulse line, and compared to the pressure given by the force of the pre-adjusted setpoint spring. Under normal service conditions the amplifying valve is closed; the pressure prevailing in the upper and lower diaphragm chambers are equal.

If the pressure to be controlled reaches the setpoint pre-adjusted at the measuring unit, the valve in the double diaphragm system will open and thus reduce the pressure in the piston chamber below the piston. The pressure of the outlet system exerted on the upper side of the piston will move the sleeve against the force of the closing spring in opening direction.

If the pressure to be monitored falls below the pre-adjusted setpoint the amplifying valve will close again to restore the pressure in the chamber below the diaphragm. Upon pressure balance prevailing in the lower and upper piston chambers the safety relief valve will automatically close tight again.

Attention: When pressurizing the system (filling the outlet line with gas) the start-up vlave should be held open to avoid incontrolled blow-off of the main valve. When the outlet pressure has reached a stable level, let go of the contact valve again.

3

Safety Relief Valve RMG 850 Design and operation

manual release (optional)

vent line

control element

4

valve cone

main valve

valve sleeve

manual start-up valve

setpoint adjuster setpoint spring

pilot

vent line

bleed bore

double diaphragm system filter RMG 905 piston assembly

measuring line

closing spring

outlet pressure atmosphere

amplifying valve

Safety Relief Valve RMG 850 Dimensions and connections

Bild 2: Stellger채t RMG 850 mit Kontrollger채t RMG 670 und schallreduzierendem Ausgangsteil

D

Bild 1: Stellger채t RMG 850 ohne Kontrollger채t

B C

L

L

5

A

number of tapped holes N

dimensions in mm DN

PN 25 + PN 40

inlet outlet L 25

25

50

80 100

A

B

C

ANSI 300RF N

200

L

A

B

C

ANSI 300 RTJ N

197

L

A

B

C

ANSI 600 RF N

L

210

4 359 M16 20 25

A

B

C

ANSI 600 RTJ N

C

N

D

4 365 M16 20 25

4

75

210

360 M12 16 21

150*

360

359

365

365

365

50

270

267

283

286

286

4 365 M16 20 25

150*

422 M16 20 25

200*

422

421

429

430

430

80

310

318

333

337

337

250*

512

100

370

300*

548

M16 20 25

8

M20 26 32

8

516 368 548

M20 26 32 M20 26 32

8 429 M16 20 25

8 8

523 384 555

M20 26 32 M20 26 32

8 430 M16 20 25

8

525 394

8

560

A

B

210

100*

4 421 M16 20 25

4 365 M16 20 25

L

M20 26 32 M24 31 38

84

8 430 M16 20 25

8 8

525 394 560

8

92 M20 26 32

8

M24 31 38

8

*) with noise reducing outlet duct (outlet flanged to ANSI 600 RF only)

connections inlet size

measuring impulse line

discharge line

84

vent line

DN

pipe

thread

pipe

thread

pipe

thread

25 50 80 100

10 x 1,5

M 14 x 1,5

12 x 1,5

M 14 x 1,5

min.

12 x 1,5

M 14 x 1,5

100 103

Safety Relief Valve RMG 850

6

Safety Relief Valve RMG 850 Type description

special feature

measuring unit

DN outlet

type

RMG 512 - 50 / 200 - 670 - So DN inlet

example:

7

type description size DN (main valve without noise reducing outlet duct) inlet

outlet

25 50 80 100

25 50 80 100

size DN (main valve with noise reducing outlet duct) inlet

outlet

25 25 50 50 80 100

100 150 150 200 250 300

measuring unit RMG 670 special feature (to be described in detail)

For More Information To learn more about RMG´s Advanced Gas Solutions, contact your RMG account manager or visit www.rmg.com GERMANY

ENGLAND

Honeywell Process Solutions

Honeywell Process Solutions

RMG Regel + Messtechnik GmbH

Bryan Donkin RMG Gas Controls Ltd.

Osterholzstrasse 45

Enterprise Drive, Holmewood

34123 Kassel, Germany

Chesterfield S42 5UZ, England

Tel: +49 (0)561 5007-0

Tel: +44 (0)1246 501-501

Fax: +49 (0)561 5007-107

Fax: +44 (0)1246 501-500

Honeywell Process Solutions

CANADA

RMG Messtechnik GmbH

Honeywell Process Solutions

Otto-Hahn-Strasse 5

Bryan Donkin RMG Canada Ltd.

35510 Butzbach, Germany

50 Clarke Street South, Woodstock

Tel: +49 (0)6033 897-0

Ontario N4S 0A8, Canada

Fax: +49 (0)6033 897-130

Tel: +1 (0)519 5398531 Fax: +1 (0)519 5373339

Honeywell Process Solutions RMG Gaselan Regel + Messtechnik GmbH

USA

Julius-Pintsch-Ring 3

Honeywell Process Solutions

15517 Fürstenwalde, Germany

Mercury Instruments LLC

Tel: +49 (0)3361 356-60

3940 Virginia Avenue

Fax: +49 (0)3361 356-836

Cincinnati, Ohio 45227, USA Tel: +1 (0)513 272-1111

Honeywell Process Solutions

Fax: +1 (0)513 272-0211

WÄGA Wärme-Gastechnik GmbH Osterholzstrasse 45

TURKEY

34123 Kassel, Germany

Honeywell Process Solutions

Tel: +49 (0)561 5007-0

RMG GAZ KONT. SIS. ITH. IHR. LTD. STI.

Fax: +49 (0)561 5007-207

Birlik Sanayi Sitesi, 6.

Cd. 62. Sokak No: 7-8-9-10

POLAND

TR - Sasmaz / Ankara, Turkey

Honeywell Process Solutions

Tel: +90 (0)312 27810-80

Gazomet Sp. z o.o.

Fax: +90 (0)312 27828-23

ul. Sarnowska 2 63-900 Rawicz, Poland Tel: +48 (0)65 5462401 Fax: +48 (0)65 5462408

RMG 850.00 2001-09 © 2010 Honeywell International Inc.