Page 1 — Type 92P
I N S T R U C T I O N S a n d PA R T S L I S T Type 92P TYPE NUMBER EXPLANATION The Type 92P is an air loaded steam pressure reducing valve which is pressure balanced. It can be used on any steam application within its pressure range and capacity. PRINCIPLE OF OPERATION Refer to the schematic illustration in Figure 1. When operation begins the manual loader loads pressure on diaphragm “H” causing it to oppose spring “E” and tending to open valve “D”, allowing steam to flow downstream. The downstream pressure registers under the main diaphragm through control line “J” and tends to balance the diaphragm. As the downstream pressure builds up, the pressure on the bottom side of the diaphragm approaches the pressure on the top, tending to close the valve. When steam demand increases, the downstream pressure decreases, thus decreasing the pressure on the bottom side of the main diaphragm, allowing the valve to open further. If the steam demand decreases, the downstream pressure increases and pressure is increased on the bottom of the main diaphragm, overcoming the balance and causing the valve to move towards the closed position. INSTALLATION Loading Relay — Any suitable air loading regulator such as a Fisher Type 67, 670 or 1301F Series can be used as a loading relay. It is recommended that a bleed orifice be installed in the second outlet of the loading relay.
1. Inspect the regulator for any shipment damage. Remove any foreign matter that may have collected in the regulator during shipment. 2. Blow out the pipe line wherever practical. 3. Install a strainer ahead of the regulator to protect the internal parts of the valve. 4. Install an upstream block valve ahead of the regulator so that the regulator can be isolated and serviced. If continuous operation is necessary during maintenance or inspection, install a bypass valve and piping around the regulator and a block valve in the downstream. 5. This regulator is intended to be installed with the diaphragm case above the pipeline so that condensate will not collect in thecase. 6. Install the regulator in the pipeline so that the flow will be in the direction indicated by the arrow cast on the body. Follow normal piping procedures when installing the screwed or flanged regulator. 7. Install the external control lines as follows: a) Connect one end of the control line to the tapped hole in the regulator body. This hole is located near the diaphragm case flange as schematically shown in Figure 2, and is NPT tapped to either 1/4” (for body sizes 1/2”, 3/4”, 1”, 1-1/4” and 1-1/2”), 3/8” (for sizes 2” and 2-1/2”) or 1/2” (for sizes 3”, 4” and 6”). The control line should be as large as the tapped hole in the regulator. b) The other end of the control line is connected to the downstream system. Locate the tapped hole for this connection in a straight run of pipe 3 to 5 feet from the regulator when it is the same size as the pipeline. Locate the tapped hole at CONSTANT LOADING PRESSURE
Dwg. AR6495 Figure 1 —Schematic illustration of Type 92P. PRINTED IN U.S.A. 5—5-69 JSS
FISHER CONTROLS COMPANY
Marshalltown, Iowa
Coraopolis, Pa.
Woodstock, Ont., Can.
Toluca, Mexico
FORM 1889A (Supersedes Form 1889)
Page 2 — Type 92P
a distance of 10 pipe diameters from the swage when the regulator is smaller than the pipeline size and swage nipples are required. c ) Do not locate the control line tap in an elbow, swage or other section of the pipeline where turbulence or abnormal velocity may occur. d) Do not locate the control line tap in a vessel (such as a deaerator) located immediately downstream of the regulator. Locate the tap in the pipeline leading to the vessel. e ) Slope the control line away from the regulator so that condensate can drain back into the pipeline. f ) Install a shutoff valve (not a needle valve) in the control line. g) Install a pressure gauge in the control line or near the outlet of the regulator to aid in setting the manual loader. 8. The maximum inlet and outlet pressures for which this regulator has been manufactured should not be exceeded. These pressures are stamped on the nameplate attached to the pilot valve. (Refer to the loading pressure chart)
LOADING PRESSURE ABOVE REDUCED PRESSURE – PSI
OPERATING PROCEDURE To Put Into Operation: 1. Open the upstream block valve. 2. Slowly open the downstream block valve. 3. Close the by-pass valve. 4. Adjust the manual loader to obtain the desired controlled pressure. To put the regulator into operation after a normal shutdown of the system it is not necessary to follow the above procedure. Simply open the block valves slowly and allow the regulator to take control of the downstream pressure at the setting of the manual loader.
If trouble occurs, check the following: 1. Buildup of downstream pressure without loading pressure on the diaphragm. a) Check internal parts for buildup of dirt, boiler compound or other matter. b) Check the trim for seizing or galling. 2. Failure to maintain downstream diaphragm. a) Check for ruptured diaphragm. b) Check sizing to make sure the valve is not undersized. 3. Cycling or hunting. a) Check to see that the valve is not oversized. A cycling Type 92P might possibly control the downstream pressure within acceptable limits but the life of the diaphragms, guide bushings, seat ring and valve plug would be greatly reduced. MAINTENANCE TO DISASSEMBLE THE MAIN VALVE
1. Isolate the valve by closing the upstream and downstream block valves. Shut the valve in the control line. 2. Blow down the isolated line to remove pressure in the main valve. 3. Shut down the manual loader and disconnect tubing from the inlet in the upper diaphragm casing. 4. Remove the bolts from the diaphragm case and lift off the upper half 5. Take out the diaphragm assembly which consists of two metal diaphragms (Key 10), a travel stop (Key 11) and a diaphragm plate (Key 20). Separate these parts by unscrewing the travel stop from the diaphragm plate. 6. Remove the cap screws (studs and nuts on maleable iron bodies) from the bottom flange (Key 2). The valve plug (Key 6) and spring (Key 7) will now drop out. 7. Pull the seat ring (Key 8), if it shows signs of wear and need to be replaced, drive the upper bushing from the body (Key 1) and pull the lower bushing from the bottom flange (Key 2). TO ASSEMBLE THE MAIN VALVE
PRESSURE DROP ACROSS VALVE – PSI
Dwg. BL4261
Figure 2 —Loading Pressure Curves
ADJUSTMENT The only adjustment that will affect the 92P is the pressure setting of the manual loader. TROUBLESHOOTING Operating difficulties may be experienced if the trim wears out, if the regulator has been improperly sized or installed, or if a build up of boiler compound or other foreign matter clogs internal parts.
Inspect all internal part for excessive wear or damage. Use new parts wherever necessary. Reassemble the main valve as follows: 1. Press new guide bushings into the body and bottom flange, if the old ones were removed. 2. Pull in the seat ring (Key 8). 3. Install the valve plug and spring. 4. Using a new bottom flange gasket, install the bottom flange (Key 2). 5. Make up the diaphragm assembly by placing the diaphragms between the diaphragm plates and clamping them together with the travel stop. 6. Put the diaphragm assembly in place on the body and replace the diaphragm case. 7. Reconnect the line from the manual loader.
Page 3 — Type 92P SERIAL NUMBER Each Type 92P reducing valve is assigned a serial number. This can be found stamped on the nameplate attached to the edge of the lower diaphragm case.
Always refer to this serial number when ordering spare parts and in all communications with the factor or representative.
40 – 100 LB AIR SUPPLY
TYPE 67FR AIR LOADING REGULATOR
TYPE 67OG PANEL LOADER CONTROL LINE TYPE 260C STRAINER
CONTROL PRESSURE
AIR LOADING TO DIAPHRAGM
TYPE 92P STEAM REDUCING VALVE
CONTROL LINE
BY-PASS LINE
TO BLADDER TYPE 92P
Dwg. AL5137
Dwg. AL4123
Figure 3—Typical installation of Type 92P.
Figure 4—Typical installation of Type 92P
PARTS NOT SHOWN 17, 19
Dwg. CL3877
Figure 5—Type 92P pressure reducing valve.
PARTS REFERENCE KEY 1
PART NUMBER
PART NAME
MATERIAL
KEY
PART NUMBER
PART NAME
Valve Body Assy., Includes 2 Bottom Flange Assy. Seat Ring and Bushing . . . . . . . . . . Iron Includes Guide Bushing 3F3118 000B 1/2” Screwed 1J3023 000A 1/2 & 3/4-inch bodies, . . . . . . . . . 3F3084 000B 3/4” Screwed 1J3024 000A 1 & 1-1/4-inch bodies . . . . . . . . . 3H5846 000B 1” Screwed 1J3026 000A 1-1/2-inch body, . . . . . . . . . . . . . . 3H5845 000B 1-1/4” Screwed 1J4339 000A 2-inch body . . . . . . . . . . . . . . . . 3H2748 000B 1-1/2” Screwed 0U0323 000A 2-1/2-inch body . . . . . . . . . . . . . . 3H2750 000A 1-1/2”, 125 lb. Flanged 0U0357 000A 3-inch body . . . . . . . . . . . . . . . . 3H2751 000A 1-1/2”, 250 lb. Flanged 0T0786 000A 4-inch body . . . . . . . . . . . . . . . . 3F2497 000B 2” Screwed 3 Guide Bushing (2 req’d) . . . . . . . . . . . . 3F2498 000B 2”, 125 lb. Flanged 1A3838 3501 1/2 & 3/4-inch bodies 3F2499 000B 2”, 250 lb. Flanged 1A4091 3501 1 & 1-1/4-inch bodies 3F3119 000B 2-1/2”, 125 lb. Flanged 1A4161 3501 1-1/2-inch body 3F3120 000B 2-1/2”, 250 lb. Flanged 1A4192 3501 2-inch body 3H3064 000A 3”, 125 lb. Flanged 1A4237 3501 2-1/2-inch body 3H3065 000A 3”, 250 lb. Flanged 1A4271 3501 3-inch body 3H3146 000A 4”,125 lb. Flanged 1A4309 3501 4-inch body 3H3147 000A 4”, 250 lb. Flanged *Recommended Sprare Parts
MATERIAL
Ductile Iron Ductile Iron Ductile Iron Ductile Iron Cast Iron Cast Iron Cast Iron SS
Page 4 — Type 92P
PARTS REFERENCE KEY
PART NUMBER
4* 0U0173 0402 1B7205 9921 0U0200 0402 1P7970 9921 0U0247 0402 1B4887 9921 0T0681 0402 0U0317 0402 0U0365 0402 0T0788 0402 5
MATERIAL
Bottom Flange Gasket 1/2” & 3/4” Bodies Asbestos Copper, Asbestos Filled 1” & 1-1/4” Bodies Asbestos Copper, Asbestos Filled 1-1/2” Body Asbestos Copper, Asbestos Filled 2” Body, Asbestos 2-1/2” Body, Asbestos 3” Body, Asbestos 4” Body, Asbestos
1A3375 1A4185 1A4186 1A3444 1A4302
2405 2405 2405 2405 2405
Cap Screws . . . . . . . . . . . . . . . . . . . . . . Steel, CD PL 1/2” & 3/4” Bodies (4 req’d) 1” & 1-1/4” Bodies (6 req’d) 1-1/2” Body (6 req’d) 2” Body (6 req’d) 2-1/2” Body (8 req’d) 3” Body (8 req’d) 4” Body (8 req’d)
2P4307 2P9796 2P9797 2P9798 2P9799 2P9800 2P9801
4617 4617 4617 4617 4619 4619 4619
Valve Plug . . . . . . . . . . . . . . . . . . . . . . . SS 1/2” & 3/4” Bodies 1” & 1-1/4” Bodies 1-1/2” Body 2” Body 2-1/2” Body 3” Body 4” Body
1A3531 2405 1A3369 2405
6*
7 0U0163 4201 0U0202 4201 0U0237 4201 0T0860 4201 0U0326 4201 0U0359 4201 0T0858 4201
Spring, . . . . . . . . . . . . . . . . Inconel 1/2” & 3/4” Bodies 1” & 1-1/4” Bodies 1-1/2” Body 2” Body 2-1/2” Body 3” Body 4” Body
2P4306 2P9803 2P9804 2P8967 2P2191 2P8980 2P9805
Seat Ring . . . . . . . . . . . . . . . . . . . . . . . . SS 1/2” & 3/4” Bodies 1” & 1-1/4” Bodies 1-1/2” Body 2” Body 2-1/2” Body 3” Body 4” Body
8*
9
PART NAME
4617 4617 4617 4619 4619 4619 4619
. . . . . . . . . . . Diaphragm Plate . . . . . . . . . . . . . . . . . . Iron 1F3090 1901 1/2” & 3/4” Bodies 1F2515 1901 1” & 1-1/4” Bodies 1F3010 1901 1-1/2” Body 1F2504 1901 2” Body 1F3126 1901 2-1/2” Body 1F3248 1901 3” Body 1F3356 1901 4” Body
KEY
PART NUMBER
10*
PART NAME
MATERIAL
3601 3601 3601 3601 3601 3601 3601
Diaphragms (2 req’d) . . . . . . . . . . . . . . SS 1/2” & 3/4” Bodies 1” & 1-1/4” Bodies 1-1/2” Body 2” Body 2-1/2” Body 3” Body 4” Body
1L3871 3513 1N9346 3513
Diaphragm Plate Plug . . . . . . . . . . . . . . SS 1/2” & 3/4” Bodies 1” & 1-1/4” Bodies
1L5862 1L5865 1L5868 1L5871 1P4337
Travel Stop . . . . . . . . . . . . . . . . . . . . . . SS 1-1/2” Body 2” Body 2-1/2” Body 3” Body 4” Body
1F3091 1F2514 1F3012 1F2503 1F3127 1F3249 1F3357 11
11 3513 3513 3513 3513 3513
12 1N6127 1917 2L6261 1917 2L5863 1901 2L5866 1902 2L5869 1902 2L5872 1902 2P4338 1902 13 1A4027 2405 1A4130 2405 1A4175 2405 1A4187 2405 1A4278 2405 14 1A3465 2412 1A4132 2412 1A4176 2412 1A4201 2412
Diaphragm Case 1/2” & 3/4” Bodies . . . . . . . . . . . . . . 1” & 1-1/4” Bodies . . . . . . . . . . . . . . 1-1/2” Body . . . . . . . . . . . . . . . . . . . . 2” Body . . . . . . . . . . . . . . . . . . . . . . . 2-1/2” Body . . . . . . . . . . . . . . . . . . . . 3” Body . . . . . . . . . . . . . . . . . . . . . . . 4” Body . . . . . . . . . . . . . . . . . . . . . . .
Ductile Iron Ductile Iron Cast Iron Cast Iron Cast Iron Cast Iron Cast Iron
Cap Screw, . . . . . . . . . . . . . . . . . . . . . . Steel, CD PL 1/2” & 3/4” Bodies (12 req’d) . 1” & 1-1/4” Bodies (12 req’d) 1-1/2” & 2” Bodies (12 req’d) 2-1/2” Body (16 req’d) 3” & 4” Bodies (16 req’d) Hex Nut . . . . . . . . . . . . . . . . . . . . . . . . . Steel, CD PL 1/2” & 3/4” Bodies (12 req’d) . 1” & 1-1/4” Bodies (12 req’d) 1-1/2” & 2” Bodies (12 req’d) 2-1/2”, 3” & 4” Bodies (16 req’d)
17
1A7675 2466
Pipe Plug (1/2” & 3/4” require 2) . . . . . . . . . . . . . . . . . . . . . . . Steel
18
1C3790 2899
Pipe Bushing . . . . . . . . . . . . . . . . . . . . Steel
19
1A3692 2409
Pipe Plug . . . . . . . . . . . . . . . . . . . . . . . . Steel
1L5861 1L5864 1L5867 1L5870 1P4339
Upper Diaphragm Plate . . . . . . . . . . . . . Steel 1-1/2” Body 2” Body 2-1/2” Body 3” Body 4” Body
20
21
2503 2503 2503 2503 2503
1A6495 2899
*Recommended Spare Part
Pipe Plug (1-1/2”, 2”, . . . . . . . . . . . . . . 2-1/2”, 3” & 4” Bodies) . . . . . . . . . . . Steel