Pressure Regulating Valves Product Guide

Transcription

1 Pressure Regulating Valves Product Guide

2 Table of Contents Pressure Regulating Valves Pressure Reducing: Standard (V182/82)...6 Pressure Reducing: High Performance (V782) Pressure Retaining: Standard (V186/86)...16 Pressure Retaining: High Performance (V786)...21 Pressure Relief: Standard (V185/85)...26 SYGEF and BCF are registered trademarks, and IR Plus is a trademark, of Georg Fischer Piping Systems td. 2

3 Pressure Regulating Valves General Specifications George Fischer offers three types of pressure regulating valve designs that either reduce, retain or relieve pressure. These valves provide highly accurate and stable pressure control irrespective of fluctuations of inlet pressure or changes in flow demand. The valve body works by balancing an adjustable spring force that pushes downward onto a diaphragm or piston/o-ring (Body Type V182) against the force of the process fluid pushing upward. Adjusted by an adjustment screw and secured with a locknut Mechanic valve parts are isolated from the process fluid Size range Pressure Range ½ 2 * 7 to 15 psi 2½ 3 14 to 9 psi 4 14 to 6 psi * 3 /8" available upon request Valve Bodies Temperature Range PVC 32 F 14 F C 6 C Beta Polypropylene -4 F 176 F -2 C 8 C SYGEF/SYGEF Plus -4 F 248 F -2 C 12 C Diaphragm: Seals: End Connections: EPDM or PTFE EPDM or FPM (FPM is supplied on PTFE Diaphragm products) Threaded (NPT), Flanged, Socket, IR Plus, BCF Plus Working Pressure Pressure (psi) Temperature ( F) 3

4 George Fischer Pressure Regulating Valves Explained Body Types PRV designs incorporate different body styles or types based on the type and size of the PRV. Changes in body type are aesthetic, but may include some internal component differences as well. Valve body type is an important consideration only when considering maintenance to a PRV. Pressure Reducing Valves Standard Design High Performance Design ½ through 1½ : Body Type V182 (new) ½ through 1½ : Body Type V782 2 through 4 : Body Type V82 Pressure Retaining Valves (Back Pressure Valves) Standard Design High Performance Design ½ through 2 : Body Type V186 (new) ½ through 1½ : Body Type V786 2½ through 4 : Body Type V86 Pressure Relief Valves Standard Design High Performance Design ½ through 2 : Body Type V185 (new) Not available 2½ through 4 : Body Type V85 High Performance Design vs. Standard Design Pressure Reducing Valves The high performance design differs in body type, size range, and in performance. Available through 1½, the high performance design offers increased pressure control accuracy. See flow characteristic graphs for complete details. Body Type V782 (high performance) is unavailable with an integral gauge, while V182/82 comes with a pressure gauge standard. Pressure Retaining Valves The high performance design differs in body type, size range, and in performance. Available through 1½, the high performance design offers increased pressure control accuracy. See flow characteristic graphs for complete details. End Connectors GF offers 9-digit part numbers for each PRV style, size and material. Each comes with a standard mounting end option per the chart below: PVC Beta PP SYGEF Threaded IR Plus IR Plus/BCF Plus Customers may also choose from a variety of available options by adding a suffix at the end of the 9-digit part number: Optional End Connectors PVC Beta PP SYGEF Socket (S) N/A 4** 4** Threaded (T) Standard 4 4 Flanged (F) (U)* * option: Socket union ends provided on all PVC sizes and body types. For Beta PP and SYGEF, butt fusion ends will be provided. ** The (S) option for Beta PP and SYGEF converts the Butt Fusion end to a male metric socket end (spigot) by adding a chamfer to the valve end. Flow The flow characteristic graphs represent flow versus pressure only when opening the valve. We recommend not exceeding a flow velocity of 2 m/s when using these valves. 4

5 Markets Automotive Biotechnical Bottling Brewing, Distilling and Beverages Chemicals Confectionery Control and Instrumentation Cosmetics Drugs and Pharmaceuticals Electronics Fertilizers and Agricultural Chemicals Food Processing Manufacturing/ Industrial Equipment Marine and Ship Building Medical and Surgical Metal and Metalworking Mining Oils (Vegetable) Paint Petroleum and Oil Photographic Pollution Control Power Generation Printing Semiconductor Water Supply and Sewage Pressure reducing valves maintain set pressure to spray nozzles for uniform spray pattern, but do not allow excess pressure through that could potentially damage the nozzles. Sample Application Schematic Back pressure valve maintains pressure to other parts of system to maintain proper flow rates through rotameters. If pressure goes too high, excess flow / pressure will feed back to tank. Back pressure valve works similar to relief valve. If pressure exceeds 6 psi, water / pressure will bypass back to tank. Monitor for proper flow through the system Isolation valve for service of gauge 5

6 Pressure Reducing Valves Body Type V182/82 The Pressure Reducing Valve reduces pressure to a given value. By utilizing the differential pressure, the valve sets itself to the set working pressure and maintains it on the downstream side, irrespective of fluctuations of inlet pressure or changes in flow. The valve works by balancing an adjustable spring force that pushes downward onto a diaphragm and against the force of the process fluid. The valve is adjusted by a set screw and secured with a locknut. Design Features Molded bodies through 1½" Hysteresis 1.5 to 6. psi/.1 to.4 bar Mechanical parts are isolated from the process fluid Valve can be adjusted under working pressure Provides highly accurate and stable pressure control Pressure differential between inlet and outlet minimum 14. psi Pressure gauge standard; gauge does not come in contact with process fluid Can be installed in any position Adjustment range on outlet of 7 to 135 psi with an inlet pressure of 15 psi Piston/O-ring design through 1½"; diaphragm design 2" 4" Product Information Size Range: ½ to 1½ (V182), 2" to 4" (V82) Pressure Rating: ½" to 1½": 7-15 psi 2" to 3": 14-9 psi 4": 14-6 psi Seals Material: EPDM, PTFE or FPM Body Material: PVC, Beta PP, SYGEF Standard, SYGEF Plus End Connections: NPT, Flange, Socket, Butt (IR or BCF) Operational characteristics for a pressure reducing valve (representation not full scale) PE Ps=PA Pö Pö Ps Pressure reduction Hysteresis P min Flow rate Q l/h Q Q max PE = adjusted input pressure PA = working pressure PÖ = opening pressure PS = closing pressure PS - PÖ = hysteresis PE - PA = flow-dependent pressure reduction PE - P min = max. pressure reduction 6

7 Pressure Reducing Valves Body Type V182/82 Installation and Operation Pos. Description 1. valve body 2. valve housing 3.* diaphragm 4.* piston 7. V82: compressor (top) 8. V82: compressor (bottom) 9.* spring assembly 1. counter nut 11. set screw 12. cylinder screw 13. V82: washer 14. cap 15. hexagonal screw 16. valve bottom with O-ring 17. ip seal (V182) 18.* V82: O-ring 19. hexagonal screw 2. piston lower part (V182) * recommanded spare parts Installation and operating advice Note the direction of flow indicated by the arrow on the valve. Can be installed in any position with no effect on functioning. Where the medium is dirty or particle-laden, we recommend installing a strainer to avoid any breakdowns. Fitting the valve between two detachable pipe connections (flanges or union ends) offers convenient valve access and is the most practical mounting configuration when frequent valve maintenance is required. Before activating, check tension/torque of body and piston bolts. Recommended Bolt-Torques Size in. Bolts body Nm* Bolts piston** Nm 3 /8 - ½ M6 x 7 9 ¾ -1 M8 x ¼-1½ M1 x M12 x 18 3 M14 x ½ M12 x M2 x 8 4 Dowel pin 3 M12 x M2 x 8 4 Dowel pin M12 x 4 45 M12 x M12 x M2 x 8 4 Dowel pin * = Torque Nm ** = Bolts piston only valid for V82 V82/V182 V82 Maintenance 1. In case the fluids are full of dirt and/or particles, the pressure reducing valves need to be cleaned depending on the degree of pollution. 2. When dismantling the reducing valve (e.g. for cleaning), you should unlock the set screw (11) until the spring assembly (9) is discharged. Only then you can unlock the cylinder screws (11) from the relief valve. 3. Depending on the operating conditions and its duration, several parts may be affected by their normal wear. In this case, we recommend you to provide the following spare parts: a) Diaphragm (3) c) Spring assembly / spiral spring (9) b) Piston (complete) (4) d) For the V82: O-ring (18) Replacing the diaphragm or the piston O-ring 1. Follow steps 1 and 2, according to the maintenance section. 2. Unscrew and remove the valve bottom (16). 3. ay down the valve (now open in both sides). 4. For V82 / V782: Hold firm the piston (4) with a convenient tool from the lower side of the valve and at the same time, open the cylinder screw with a hexagon key from the upper side. For V182: Detatch piston bottom. Now push up the piston. Go to step Remove the cylinder screw (12) / (19) and diaphragm (3). 6. Remove the piston from the bottom. 7. Remove the lip seal (17) / the O-ring (18) from the inside of the valve body (1). Reassemble in reverse order. 7

8 Pressure Reducing Valves Body Type V182/82 Dimensions Inch mm Ø D size d Inch h H PVC PP SYGEF SYGEF Plus Butt/ sckt Butt/ sckt Butt ½ ¾ ¼ ½ ½

9 Pressure Reducing Valves Body Type V182/82 Flow Characteristics The graphs represent pressure below set pressure. For example, a ½ pressure reducing valve with a set pressure of 42 psi and outlet pressure 34 psi will produce a flow rate of 4 through the valve /8" 1/2" 2 15 ¾" 1" P (PSI) = set pressure outlet pressure P (PSI) = set pressure outlet pressure ¼ 1½ in 2½ in P (PSI) = set pressure outlet pressure P (PSI) = set pressure outlet pressure 3 4 in 25 3 in P (PSI) = set pressure outlet pressure 9

10 Pressure Reducing Valves Body Type V182/82 Part Numbers Inch size Metric size (mm) Set Range in psi Body Type PVC Threaded [NPT] Beta PP IR Plus SYGEF Standard IR Plus/BCF Plus SYGEF Plus 2 PVDF-HP IR Plus/ BCF Plus EPDM FPM 1 EPDM FPM 1 FPM 1 FPM 1 ½ ¾ See note 3 1¼ ½ EPDM PTFE 1 EPDM PTFE 1 PTFE N/A 2½ N/A N/A N/A N/A N/A 1 Body Type V182 uses an FPM o-ring and piston design (through 1½"). Body Type V82 uses a PTFE diaphragm (2" through 4"). 2 Please allow sufficient time after installation, adjustment, or mechanical movement to avoid particle contamination within your UPW system. Consult GF for details. 3 Body Type V82 available ½" through 2" in SYGEF Plus. Consult GF for part numbers. End Connector Options (½ to 4 ) PVC Beta PP SYGEF PVDF Socket Fusion (S) N/A 4** 4** Threaded [NPT] (T) Standard 4 4 * (U) Flanged (F) * ends are socket for PVC, butt fusion for Beta PP and SYGEF ** The (S) option for Beta PP and SYGEF converts the Butt Fusion end to a male metric socket end (spigot) by adding a chamfer to the valve end. Ordering Instructions Ordering example Socket Fusion (S) XXX.XXX.XXX S Socket Fusion Ends Threaded [NPT] (T) XXX.XXX.XXX T Threaded Ends Socket (U) XXX.XXX.XXX U Socket Ends Flanged (F) XXX.XXX.XXX F Flanged Ends Weight Inch size mm d Approx. Weight (kg) PVC PP PVDF ½ ¾ ¼ ½ ½

11 Pressure Reducing Valves Body Type V782 The Pressure Reducing Valve reduces the pressure within the system to a pre-set value. By using the differential pressure, the pressure reducing valve adjusts itself to the set working pressure. The outlet pressure (working pressure) is not directly related to the inlet pressure. If the outlet pressure increases or decreases above/below the desired value, the diaphragm is lifted against the spring force or pressed down by the spring force, as the case may be, by the outlet pressure. The pressure reducing valve begins to close/open until a state of equilibrium is re-established; in other words, the outlet pressure remains constant irrespective of an increasing or decreasing inlet pressure. Design Features Molded body Excellent control characteristics Hysteresis 1.5 to 6. psi/.1 to.4 bar Mechanical parts are isolated from the process fluid Pressure differential between inlet and outlet minimum 14 psi Product Information Size Range: 3/8 to 1½ Pressure Rating: 7 to 15 psi Diaphgragm Material: EPDM or PTFE Body Material: PVC, Beta PP, SYGEF, SYGEF Plus End Connections: NPT, Flange, Socket, Spigot (socket fusion), Butt (IR or BCF) Operational characteristics for a pressure reducing valve (representation not full scale) PE Ps=PA Pö Pö Ps Pressure reduction Hysteresis P min Flow rate Q l/h Q Q max PE = adjusted input pressure PA = working pressure PÖ = opening pressure PS = closing pressure PS - PÖ = hysteresis PE - PA = flow-dependent pressure reduction PE - P min = max. pressure reduction 11

12 Pressure Reducing Valves Body Type V782 Installation and Operation Pos. Description 1. valve body 2. valve housing 3.* diaphragm 4.* piston 5. V782: compressor 6. V782: spring compressor 9.* spring assembly 1. counter nut 11. set screw 12. cylinder screw 14. cap 15. hexagonal screw; V782: with nuts and caps 16. valve bottom with O-ring 17. V782: lip seal 19. hexagonal screw * recommanded spare parts Maintenance 1. In case the fluids are full of dirt and/or particles, the pressure reducing valves need to be cleaned depending on the degree of pollution. 2. For the V782: Remove the protection caps of the hexagonal screws (15) from the valve housing (2), unlock the screws (15), put away the housing (2) and also the spring compressor (12) with the spring assembly (9). 3. Depending on the operating conditions and its duration, several parts may be affected by their normal wear. In this case, we recommend you to provide the following spare parts: a) Diaphragm (3) c) Spring assembly/spiral spring (9) b) Piston (complete) (4) d) For the V782: lip seal (17) Replacing the diaphragm 1. Follow steps 1 and 2, according to maintenance section. 2. Unscrew and remove the valve bottom (16). 3. ay down the valve (now open in both sides). 4. Hold firm the piston (4) with a convenient tool from the lower side of the valve and at the same time, open the cylinder screw with a hexagon key from the upper side. 5. Remove the cylinder screw (12) / (19) and diaphragm (3). 6. Remove the piston from the bottom. 7. Remove the lip seal (17) / the O-ring (18) from the inside of the valve body (1). Reassemble in reverse order. Setting up the operating pressure 1. Detach the plastic cap (14) from the top (2) of the valve. 2. Undo the counter nut (1). 3. Turn the set screw with a screwdriver/hexagonal key as follows: a) clockwise: The operating pressure is increasing b) counterclockwise: The operating pressure is decreasing 4. Once set up the operating pressure, secure it with counter nut (1). Recommended Bolt-Torques Size in. Bolts body Nm* 3 /8 - ½ M6 x 35 8 ¾ -1 M6 x 4 1 1¼-1½ M8 x 5 15 * = Torque Nm Operating faults and possible causes Fault Cause Correction Valve not sealed at the diaphragm Diaphragm not pressed on hard enough Tighten screws (15) Pressure rises above the set value Piston (4) not sealed Check piston and piston position and possibly replace Diaphragm (3) not sealed Replace diaphragm, dismantle upper valve body ip seal (17) not sealed Replace seal, dismantle lower valve body Control holes in piston are blocked Dismantle piston and clean holes Valve closed will not open Installed wrong way round Turn valve round, check arrow indicating flow direction ower valve body not sealed at vent plug O-ring not sealed Dismantle vent plug, and replace O-ring Medium leaks out at the adjusting screw Diaphragm is faulty Replace diaphragm, dismantle lower valve body Installation advice: We recommend installing the fittings between 2 detachable pipe connections. 12

13 Pressure Reducing Valves Body Type V782 Dimensions IR BCF Socket union Flange drilled to ANSI 15 NPT female thread Inch mm Ø D h size d Inch H PVC PP SYGEF SYGEF Plus Butt/ sckt Butt/ sckt Butt ½ ¾ ¼ ½

14 Pressure Reducing Valves Body Type V782 Flow Characteristics The graphs represent pressure below set pressure. For example, a ½ Pressure Reducing Valve with a set pressure of 42 psi and outlet pressure 34 psi, will produce a flow rate of 2.5 through the valve /8" 1/2" P PSI = set pressure outlet pressure ¾" 1" P PSI = set pressure outlet pressure P PSI = set pressure outlet pressure 1¼" 1½" 14

15 Pressure Reducing Valves Body Type V782 Part Numbers Inch size Metric size Set Range in PVC Threaded [NPT] Beta PP IR Plus SYGEF Standard IR Plus/BCF Plus *SYGEF Plus IR Plus/BCF Plus (mm) psi EPDM PTFE EPDM PTFE PTFE PTFE ½ ¾ ¼ ½ *V782 SYGEF Plus is maintenance free. Please allow sufficient rinse time after installation, adjustment, or mechanical movement to avoid particle contamination in your UPW system. Consult GF for details. End Connector Options (½ to 1½ ) PVC Beta PP SYGEF PVDF Socket Fusion (S) N/A 4** 4** Threaded [NPT] (T) Standard 4 4 * (U) Flanged (F) * ends are socket for PVC, butt fusion for Beta PP and SYGEF ** The (S) option for Beta PP and SYGEF converts the Butt Fusion end to a male metric socket end (spigot) by adding a chamfer to the valve end. Ordering Instructions Ordering example Socket Fusion (S) XXX.XXX.XXX S Socket Fusion Ends Threaded [NPT] (T) XXX.XXX.XXX T Threaded Ends Socket (U) XXX.XXX.XXX U Socket Ends Flanged (F) XXX.XXX.XXX F Flanged Ends Weight Inch mm d Approx. Weight (kg) size PVC PP PVDF 3 / ½ ¾ ¼ ½

16 Pressure Retaining Valves (Back Pressure Valves) Body Type V186/86 The Pressure Retaining Valve serves to keep the working or system related pressures constant, to balance out pressure pulsation and to reduce pressure peaks in process systems. If the inlet pressure rises above the set value, the pressurized valve piston is lifted against the spring force. Consequently, the valve opens and there is a reduction of pressure through the outlet pipe. The valve closes as soon as the inlet pressure sinks below the pre-set spring tension. When used as a bypass, it can also function as a relief valve to reduce pressure peaks. Design Features Compact construction Hysteresis 1.5 to 8.7 psi/.1 to.6 bar ow maintenance No dead space in flow path (through 2 ) Valve can be adjusted under working pressure Mounting position depends on flow direction Provides highly accurate and stable pressure control Pressure differential between inlet and outlet minimum 14 psi Product Information Size Range: ½ to 2" (V186), 2½" to 4 (V86) Pressure Rating: ½ to 2": 7-15 psi 2½ to 3": 14-9 psi 4": 14-6 psi Diaphragm Material: EPDM or PTFE Body Material: PVC, Beta PP, SYGEF, SYGEF Plus End Connections: NPT, Flange, Socket, IR Plus/BCF Plus Operational Schematics 1. Constant system pressure 2. Open user 1 and/or 2, pressure retaining valve closes p A 1 p > P p A p > P = Valve opens p < P = Valve closed V 1 1 V 2 2 p > P = Valve opens p < P = Valve closded V 1 + V 2 < V max (Valve) p P p P 3. Pressure retaining valve as relief valve Tank pressure or system pressure may not exceed max. pressure value 1 p A p < Ö p A p > P = Valve opens p < P = Valve closed p P pa = working pressure pp = pump pressure pö = opening pressure 16

17 Pressure Retaining Valves (Back Pressure Valves) Body Type V186/86 Installation and Operation Pos. Description 1. valve body 2. valve housing 3.* diaphragm 4.* piston 5. compressor 6.* spring assembly 7. counter nut 8. set screw 9. cylinder screw 1. cap 11. hexagonal screw with nuts and caps 12. spring disc *Recommended spare parts Installation and operating advice Do observe the flow direction! It is marked with an arrow on the valve body. It can be installed in any position. In case of dirty fluids or fluids with particles, we recommend that you install a line strainer in front of the unit. Fitting the valve between two detachable pipe connections (flanges or union ends) offers convenient valve access and is the most practical mounting configuration when frequent valve maintenance is required. Before activating, you must check the tension of the body and piston bolts. If necessary, fix bolts cross-over [see chart below]. Start process slowly and gradually increase to full pressure. Disassembly Instructions 1. Dismantle the upper valve body 1.1 Put the valve in an upright position 1.2 Unscrew the cap (1) 1.3 Undo the locknut on the adjusting screw (7) and undo the adjusting screw until the compression spring (6) is fully released 1.4 Remove the covering caps on the screws (1) of the upper body and undo the screws 1.5 ift the upper body (2) upwards and remove the spring plate and the spring (6) 2. Dismantle the lower valve body and the diaphragm 2.1 Carry out steps 1.1 to Remove the complete compressor stem (5) 2.3 Remove the diaphragm (3) These steps are carried out in reverse order to reassemble. Please see individual parts for positions and assembly diaphragms. Recommended Bolt-Torques V82 V182 DIN Bolts body Nm* 1/15/2 M6 x /32 M8 x /5 M1 x M12 x M12 x M12 x M12 x 1 45 * = Torque Nm 17

18 Pressure Retaining Valves (Back Pressure Valves) Body Type V186/86 Dimensions Inch mm Ø D h size d Inch H PVC PP SYGEF SYGEF Plus Butt/ sckt Butt/ sckt ½ ¾ ¼ ½ ½ Butt 18

19 Pressure Retaining Valves (Back Pressure Valves) Body Type V186/86 Flow Characteristics The graphs represent pressure over set pressure. For example, a ½ Pressure Retaining Valve with a set pressure of 42 psi and inlet pressure 48 psi will produce a flow rate of 3.5 through the valve /8 1/ ¾" 1" P PSI = inlet pressure set pressure P PSI = inlet pressure set pressure P PSI = inlet pressure set pressure 1¼" 1½" P PSI = inlet pressure set pressure 2" 2½" P PSI = inlet pressure set pressure 3" 4" 19

20 Pressure Retaining Valves (Back Pressure Valves) Body Type V186/86 Part Numbers Inch size Metric size Set Range Body Type PVC Threaded [NPT] Beta PP IR Plus SYGEF Standard IR Plus SYGEF Plus IR Plus/BCF Plus (mm) in psi EPDM PTFE EPDM PTFE PTFE PTFE ½ ¾ ¼ ½ ½ N/A N/A N/A N/A N/A N/A = Not Available End Connector Options (½ to 4 ) PVC Beta PP SYGEF PVDF Socket Fusion (S) N/A 4** 4** Threaded [NPT] (T) Standard 4 4 * (U) Flanged (F) * ends are socket for PVC, butt fusion for Beta PP and SYGEF ** The (S) option for Beta PP and SYGEF converts the Butt Fusion end to a male metric socket end (spigot) by adding a chamfer to the valve end. Ordering Instructions Ordering example Socket Fusion (S) XXX.XXX.XXX S Socket Fusion Ends Threaded [NPT] (T) XXX.XXX.XXX T Threaded Ends Socket (U) XXX.XXX.XXX U Socket Ends Flanged (F) XXX.XXX.XXX F Flanged Ends Weight Inch mm d Approx. Weight (kg) size PVC PP PVDF ½ ¾ ¼ ½ ½

21 Pressure Retaining Valves (Back Pressure Valve) Body Type V786 The Pressure Retaining Valve serves to keep the working or system related pressures constant, to balance out pressure pulsation, and to reduce pressure peaks in chemical process systems. If the inlet pressure rises above the set value, the pressurized valve piston is lifted against the spring force. Consequently, the valve opens and there is a reduction of pressure through the outlet pipe. The valve closes as soon as the inlet pressure sinks below the pre-set spring tension. Design Features Molded bodies Superior control characteristics Hysteresis 1.5 to 6. psi/.1 to.4 bar Mechanical parts are isolated from the process fluid Valve can also be adjusted under working pressure Provides increased pressure control accuracy vs. Type V186/V86 Pressure differential between inlet and outlet minimum 14 psi Product Information Size Range: ½ to 1½ Pressure Rating: 7 to 15 psi Diaphragm Material: EPDM or PTFE Body Material: PVC, Beta PP, SYGEF, SYGEF Plus End Connections: NPT, Flange, Socket, IR Plus/BCF Plus Operational Schematics 1. Constant system pressure 2. Open user 1 and/or 2, pressure retaining valve closes p A 1 p > P p A p > P = Valve opens p < P = Valve closed V 1 1 V 2 2 p > P = Valve opens p < P = Valve closded V 1 + V 2 < V max (Valve) p P p P 3. Pressure retaining valve as relief valve Tank pressure or system pressure may not exceed max. pressure value 1 p A p < Ö p A p > P = Valve opens p < P = Valve closed p P pa = working pressure pp = pump pressure pö = opening pressure 21

22 Pressure Retaining Valves (Back Pressure Valve) Body Type V786 Installation and Operation Pos. Description 1. valve body 2. valve housing 3.* diaphragm 4.* piston 5. compressor 6.* spring assembly 7. counter nut 8. set screw 9. cylinder screw 1. cap 11. hexagonal screw with nuts and caps 12. spring disc *Recommended spare parts Installation 1. Note the direction of flow indicated by the arrow on the valve. 2. It can be installed in any position. 3. Where the medium is dirty or particle-laden, we recommend installing a strainer to avoid any breakdowns. 4. Fitting the valve between two detachable pipe connections (flanges or union ends) offers convenient valve access and is the most practical mounting configuration when frequent valve maintenance is required. 5. Before activating, check the tension of the body and piston bolts. If necessary fix bolts cross-over (see Bolt-Torque table below). Setting up the operating pressure 1. Detach the plastic cap (1) from the top (2) of the valve. 2. Undo the counter nut (7). 3. Turn the set screw with a screwdriver/hexagonal key as follows: a) clockwise The operating pressure is increasing b) counterclockwise The operating pressure is decreasing 4. Once set up the operating pressure, secure it with the counter nut (7). Recommended Bolt-Torques DN Bolts body Nm* Bolts piston Nm* 1/15 M6 x 35 8 M5 x /25 M6 x 4 1 M8 x /4 M8 x 5 15 M1 x 6 1 Maintenence 1. The pressure retaining valves types V86 / V786 / V786 require very little maintenance. 2. In case the fluids are full of dirt and/or particles, the pressure retaining valves need to be cleaned depending on the degree of pollution. 3. Remove the protection caps of the hexagonal screws (11) from the valve housing (2), unlock the screws (11), remove the housing (2) and also the spring compressor (12) with the spring assembly (6). Remove the whole piston (4) with the diaphragm (3) and the compressor (5). Hold the piston tight from the bottom to prevent twisting. Remove the diaphragm (3) and compressor (5) from the piston (4). 4. Depending on the operating conditions and its duration, several parts may be affected by their normal wear. In this case, we recommend you to provide the following spare parts: a) Diaphragm (3) b) Piston (complete) (4) c) Spring assembly/sprial spring (6) Operating faults and possible causes Fault Cause Correction Valve not sealed at the diaphragm Diaphragm not pressed on hard enough Tighten screws (1) Pressure falls below the set value Piston base (2) not sealed Check piston and piston base seal and possibly replace. Dismantle lower body Diaphragm (3) not sealed Replace diaphragm, dismantle lower valve body Medium leaks out at the adjusting screw Diaphragm is faulty Replace diaphragm, dismantle lower valve body

23 Pressure Retaining Valves (Back Pressure Valve) Body Type V786 Dimensions IR/BCF Socket union Flange drilled to ANSI 15 NPT female thread Inch mm Ø D h size d Inch H PVC PP SYGEF SYGEF Plus Butt/ sckt Butt/ sckt Butt ½ ¾ ¼ ½

24 Pressure Retaining Valves (Back Pressure Valve) Body Type V786 Flow Characteristics The graphs represent pressure over set pressure. For example, a ½ Pressure Retaining Valve with a set pressure of 42 psi and inlet pressure 48 psi will produce a flow rate of 4.5 through the valve /8" 1/2" P PSI = inlet pressure set pressure 2 15 ¾" 1" P PSI = inlet pressure set pressure 1¼" 1½" P PSI = inlet pressure set pressure 24

25 Pressure Retaining Valves (Back Pressure Valve) Body Type V786 Part Numbers Inch size Metric size (mm) Set Range in psi PVC Threaded [NPT] Beta PP IR Plus SYGEF Standard IR Plus/BCF Plus SYGEF Plus PVDF-HP IR Plus/ BCF Plus EPDM PTFE EPDM PTFE PTFE PTFE ½ ¾ ¼ ½ End Connector Options (½ to 1½ ) PVC Beta PP SYGEF PVDF Socket Fusion (S) N/A 4** 4** Threaded [NPT] (T) Standard 4 4 * (U) Flanged (F) * ends are socket for PVC, butt fusion for Beta PP and SYGEF ** The (S) option for Beta PP and SYGEF converts the Butt Fusion end to a male metric socket end (spigot) by adding a chamfer to the valve end. Ordering Instructions Ordering example Socket Fusion (S) XXX.XXX.XXX S Socket Fusion Ends Threaded [NPT] (T) XXX.XXX.XXX T Threaded Ends Socket (U) XXX.XXX.XXX U Socket Ends Flanged (F) XXX.XXX.XXX F Flanged Ends Weight Inch mm d Approx. Weight (kg) size PVC PP PVDF 3 / ½ ¾ ¼ ½

26 Pressure Relief Valves Body Type V185/85 The Pressure Relief Valve serves to keep the working or system related pressures constant, to balance out pressure pulsation, and to reduce pressure peaks in process systems. The third pipe spigot fitted on the valve body means the valve can be installed directly in the main pipeline. If the inlet pressure rises above the set value, the pressurized valve piston is lifted against the spring force. Consequently, the valve opens and there is a reduction of pressure in the outlet pipe. The excess pressure can exhaust or be redirected via the third outlet. The valve closes as soon as the inlet pressure sinks below the pre-set spring tension. Design Features Compact construction No need for an extra tee (less welding) No dead space in flow path (through 2 ) ow maintenance Valve mounting with threaded insert on lower body Pressure differential between inlet and outlet minimum 14 psi Product Information Size Range: ½ to 2 (V185), 2 ½" to 4" (V85) Pressure Rating: ½ to 2": 7-15 psi 2½ to 3": 14-9 psi 4": 14-6 psi Diaphragm Material: EPDM or PTFE Body Material: PVC, Beta PP, SYGEF standard, SYGEF Plus End Connections: NPT, Flange, socket union, IR Plus, BCF Plus 26

27 Pressure Relief Valves Body Type V185/85 Installation and Operation Pos. Description 1. valve body 2. housing 3.* diaphragm 4.* piston 5. compressor 6.* spring assembly 7. counter nut 8. set screw 9. cylinder screw 1. cap 11. spring compressor *Recommanded spare parts Installation 1. Do observe the flow position! It is marked with an arrow on the valve body. 2. It can be installed in any position. 3. In case of dirty fluids or of fluids with particles, we recommend you to install a line strainer in front of the unit. 4. Fitting the valve between two detachable pipe connections (flanges or union ends) offers convenient valve access and is the most practical mounting configuration when frequent valve maintenance is required. 5. Before activating you must check the tension of the body and piston bolts. If necessary fix bolts (see chart below). Recommended Bolt-Torques DN Bolts / body Nm* 1/15/2 M6 x /32 M6 x /5 M8 x M12 x M12 x M12 x M12 x 2 *Torque Nm V185 V85 Setting up the Operating Pressure 1. Detach the plastic cap (1) from the top (2) of the valve. 2. Undo the counter nut (7). 3. Turn the set screw with a screwdriver/hexagonal key as follows: a) clockwise - The operating pressure is increasing b) counterclockwise - The operating pressure is decreasing 4. Once set up the operating pressure, secure it with counter nut (7). Maintenance 1. In case the fluids are full of dirt and/or particles, the pressure reducing valves need to be cleaned depending of pollution. 2. When dismantling the reducing valve (e.g. for cleaning), you should unlock the set screw (8) until the spring assembly (5) is discharged. Only then you can unlock the cylinder screw (9) from the relief valve. 3. Depending on the operating conditions and its duration, several parts may be affected by their normal wear. In this case, we recommend you to provide the following spare parts: a) Diaphragm (3) b) Piston (complete) (4) c) Spring assembly (6) 27

28 Pressure Relief Valves Body Type V185/85 Dimensions Inch mm Ø D h size d Inch H PVC PP SYGEF SYGEF Plus Butt/ sckt Butt/ sckt ½ ¾ ¼ ½ ½ Butt 28

29 Pressure Relief Valves Body Type V185/85 Flow Characteristics The graphs represent pressure over set pressure. For example, a ½ Pressure Relief Valve with a set pressure of 42 psi and inlet pressure 48 psi will produce a flow rate of 3. through the valve /8" 1/2" 2 15 ¾" 1" P PSI = inlet pressure set pressure P PSI = inlet pressure set pressure ¼" 1½" " 2½" P PSI = inlet pressure set pressure P PSI = inlet pressure set pressure " 4" P PSI = inlet pressure set pressure 29

30 Pressure Relief Valves Body Type V185/85 Part Numbers Inch size Metric size Set Range Body Type PVC Threaded [NPT] Beta PP IR Plus SYGEF Standard IR Plus/BCF Plus SYGEF Plus PVDF-HP IR Plus/BCF Plus (mm) in psi EPDM PTFE EPDM PTFE PTFE PTFE ½ ¾ ¼ ½ ½ N/A N/A N/A N/A N/A End Connector Options (½ to 4 ) PVC Beta PP SYGEF PVDF Socket Fusion (S) N/A 4** 4** Threaded [NPT] (T) Standard 4 4 * (U) Flanged (F) * ends are socket for PVC, butt fusion for Beta PP and SYGEF ** The (S) option for Beta PP and SYGEF converts the Butt Fusion end to a male metric socket end (spigot) by adding a chamfer to the valve end. Ordering Instructions Ordering example Socket Fusion (S) XXX.XXX.XXX S Socket Fusion Ends Threaded [NPT] (T) XXX.XXX.XXX T Threaded Ends Socket (U) XXX.XXX.XXX U Socket Ends Flanged (F) XXX.XXX.XXX F Flanged Ends Weight Inch mm d Approx. Weight (kg) size PVC PP PVDF ½ ¾ ¼ ½ ½

31 Valve Application Assistance Form Complete all sections. Fax this form to: George Fischer, Inc., Technical Service Department at (714) Distributor Contact: Date: End-User Company: Contact: Address City: State: ip: Phone: Ext: Fax: Name of Project: GF Distributor: Contact: Tel: Description of Application: Valve Style: Ball Diaphragm Butterfly Angle Seat PRV Metering Accessories: ock-out imit Switches Gear Operator Chain Wheel Body Material: PVC CPVC PP PVDF Size: Seal Material: FPM EPDM NBR PTFE Other: If Actuated: Electric Supply Voltage: Appoximate number of cycles per hour? Pneumatic: Air Supply Pressure? psig Pilot Valve: 3-Way or 4-Way Fail Safe: FC or FO Double-Acting Modulating Input Signal? What is the set point? Accessories: Manual-Override imit Switches Stroke imiter Speed Control Other: Fluid: Concentration: Solids Content: % Particle Size Ambient temp: Min: F Max: F Process Temp: min: F Max: Type: F Working Press : Min: psig Max: psig Type: Flow Rate: gpm lpm Installation: Indoor or outdoor Exposed to sunlight: Yes No On the Wall or Suspended For George Fischer Use Only Required changes in application Unsure of your application? Ask about our Performance Purchase Order Program.

32 Pressure Regulating Valves Product Guide George Fischer, Inc Dow Avenue, Tustin, CA Tel. (714) , Toll Free (8) , Fax (714) Australia George Fischer Pty td Kingsgrove NSW 28 Phone +61() Denmark / Iceland Georg Fischer A/S 263 Taastrup Phone +45 () info.dk.ps@georgfischer.com India George Fischer Piping Systems td 4 93 Mumbai Phone +91() in.ps@georgfischer.com Norway Georg Fischer AS 1351 Rud Phone no.ps@georgfischer.com Sweden / Finland Georg Fischer AB Älvsjö-Stockholm Phone +46() se.ps@georgfischer.com Austria Georg Fischer Rohrleitungssysteme GmbH 313 Herzogenburg Phone +43() austria.ps@georgfischer.com France George Fischer S.A.S Saint-Denis Cedex 1 Phone +33() fr.ps@georgfischer.com Italy Georg Fischer S.p.A. 263 Cernusco S/N (MI) Phone it.ps@georgfischer.com Poland Georg Fischer Sp. z o.o Warszawa Phone +48() poland.ps@georgfischer.com Switzerland Georg Fischer Rohrleitungssysteme (Schweiz) AG 821 Schaffhausen Phone +41() ch.ps@georgfischer.com Belgium / uxembourg Georg Fischer NV/SA 17 Bruxelles/Brüssel Phone +32() be.ps@georgfischer.com Germany Georg Fischer GmbH 7395 Albershausen Phone +49() info.de.ps@georgfischer.com Japan Georg Fischer td Osaka Phone +81() jp.ps@georgfischer.com Romania Georg Fischer Rohrleitungssysteme AG 7 Bucharest - Sector 1 Phone +4() ro.ps@georgfischer.com United Kingdom / Ireland George Fischer Sales imited Coventry, CV2 2ST Phone +44() uk.ps@georgfischer.com Brazil George Fischer tda São Paulo Phone +55() br.ps@georgfischer.com Georg Fischer DEKA GmbH Dautphetal-Mornshausen Phone +49() deka.ps@georgfischer.com Malaysia Georg Fischer (M) Sdn. Bhd. 475 Subang Jaya Phone conne.kong@georgefischer.com.my Singapore George Fischer Pte td Singapore Phone +65() sgp.ps@georgfischer.com USA / Canada / atin America / Carribean George Fischer Inc. Tustin, CA Phone (714) , Toll Free (8) us.ps@georgfischer.com China Georg Fischer Piping Systems td Shanghai Pudong, Shanghai Phone +86() china.ps@georgfischer.com Greece Georg Fischer S.p.A Athens Phone +3()1/ office@piping-georgfischer.gr Netherlands Georg Fischer N.V PA Epe Phone +31() nl.ps@georgfischer.com Spain / Portugal Georg Fischer S.A. 289 Madrid Phone +34() es.ps@georgfischer.com Export Georg Fischer Rohrleitungssysteme (Schweiz) AG 821 Schaffhausen Phone +41() export.ps@georgfischer.com Item #1229 (1/6) George Fischer, Inc. 26 Printed in USA