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Download the Datasheet!
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Pressure Relief Valves
Griffco diaphragm back pressure valves are designed to enhance the performance of chemical feed systems by applying a continuous back pressure to the chemical feed pump, while also acting as an anti-syphon valve.
Robust construction ensures reliability in the rigorous service of municipal and industrial applications.
Wetted materials include: PVC, CPVC, PP, PVDF, PTFE, 316 SS, A 20 and Hast. C.
Available sizes: ¼" - ½".
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Features:
- High Reliability / Low Cost
- Robust, Machined Construction
- Vulcanised PTFE/EPDM Diaphragm
- Adjustable 10 - 150 PSI
- Optional 350 PSI Rated Valve
- 2 & 3 Port Configurations
- Ventable to Suction Line
- Wide Range of Materials
- Corrosion Resistant Design
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Operation:
Griffco diaphragm pressure relief valves operate when the pressure in the chemical system exceeds the preset pressure of the valve. The diaphragm is held against the valve seat by an internal spring. When the preset pressure is exceeded the diaphragm is forced up and the chemical flows out the relief port, back to the chemical tank or to the suction side of the pump. The valves
are pre-set at 50 psi, however they are field adjustable from 10 - 150 psi, (optional 350 psi) via the adjustment screw. The relief valve should be set approximately 15 psi higher than the system pressure. Installation should be made as close to the pump as possible, without any valves or accessories between the relief valve and the pump. Consult your pump manufacturer for his recommendations.
Technical Data:
Sizes:
Model PRV
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½", ¾", 1", - 3 Port Valves: 1 ½", 2" - 2 Port Valves
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| Connections: |
NPT, Socket, Flange |
| Pressure Adjustment |
10 - 50 psi; 10 - 150 psi; 50 - 350 psi |
| Flow Rates @ 150 psi |
Shipping Weight: lbs |
| Size |
Pulsating |
Continuous |
Plastic |
Metal / Plastic Top |
Metal / Metal Top |
1/2"
3/4"
1"
1 1/2"
2"
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320 USgph
367 USgph
461 USgph
1388 USgph
2000 USgph
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16 USgpm
19 USgpm
24 USgpm
72 Usgpm
104 USgpm
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3.0
3.0
3.5
9.0
9.0
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5.5
5.5
6.0
18.5
20.0
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6.5
6.5
7.0
26.0
30.0
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| Max Temperature: (°F) |
Plastic: 140° ; Metal: 300° (Peak Short Term 390°) |
| Materials of Construction: |
| Diaphragm |
PTFE / EPDM, Optional: Viton & PTFE / Viton |
| Valve Top |
Standard: PVC
Optional: CPVC, Steel, 316 SS, Others on Request |
| Valve Body |
PVC, CPVC, PP, PTFE, PVDF, 316 SS, A 20, Hast. C, Others upon Request |
Dimensions:
| D |
A |
B |
C |
| 1/2" |
5.60 |
3.50 |
1.10 |
| 3/4" |
5.60 |
3.50 |
1.10 |
| 1" |
5.90 |
3.50 |
1.25 |
| 1 1/2" |
8.95 |
4.50 |
2.10 |
| 2" |
8.95 |
5.00 |
2.10 |
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Performance Curves:
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