Griffco offers a variety of pressure relief valves and options that work in many different applications. There are four main types of pressure relief valves:
- M-Series: Small
connections (1/4" to 1/2" or DN 8 to DN 15)
- G-Series: Medium
to large connections (1/2" to 4" or DN 15 to DN 100)
- High-Flow: High-flow
connections (1/2" to 1" or DN 15 to DN 25)
- High-Pressure: High-pressure connections up to 2000 psi (138 bar) in sizes from 1/4" to 1" (DN 8 to DN 25)
Variations and Options Include:
- NEW Unibody: valve with union connections, made from a solid PVC or CPVC body
- PTFE Flanged: G-Series valve with flange connections, made from a solid PTFE body
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Standard Materials:
- PP
- PVC
- CPVC
- PVDF
- TFE
- Halar®
- 316 SSL
- Alloy 20
- Hastelloy®C
Standard Connections:
- Threaded
- Flanged
- Union
- Socket
Spring Ranges:
- 10 to 150 psi (1 to 10 bar) standard
- 0 to 50 psi (0.0 to 3.5 bar)
- 10 to 250 psi (1 to 17 bar)
- 50 to 350 psi (3.5 to 25 bar)
- 350 to 2000 psi (24 to 138 bar)
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Diaphragm Materials:
- EPDM/PTFE (standard)
- FKM (Viton®)
- CSM (Hypalon®)
- PTFE/FKM
- Kalrez®
Configurations:
- 3-port (up to 1" or DN 25) standard
- 2-port 180º
- 2-port 90º
- Wall mount
Options:
- Adjustment knob
- Metal tops
- Metal adjustment screw
- Material certifications
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| Sizes, Flow Capacities & Pressure Ratings |
| Series |
Size |
Maximum Flow |
Maximum Pressure |
| Pulsating |
Continuous |
| Inch |
Metric |
GPH |
LPH |
GPM |
LPM |
PSI |
BAR |
| M-Series |
1/4" |
DN 8 |
100 |
375 |
5 |
19 |
350 |
24 |
| 3/8" |
DN 10 |
200 |
757 |
10 |
37 |
350 |
24 |
| 1/2" |
DN 15 |
260 |
984 |
15 |
57 |
350 |
24 |
| Unibody |
1/2" |
DN 15 |
260 |
984 |
15 |
57 |
150 |
10 |
| 3/4" |
DN 20 |
300 |
1,135 |
21 |
80 |
150 |
10 |
| 1" |
DN 25 |
500 |
1,890 |
26 |
98 |
150 |
10 |
| G-Series |
1/2" |
DN 15 |
300 |
1,135 |
21 |
80 |
350 |
24 |
| 3/4" |
DN 20 |
300 |
1,135 |
21 |
80 |
350 |
24 |
| 1" |
DN 25 |
500 |
1,890 |
26 |
98 |
350 |
24 |
| 1-1/2" |
DN 40 |
1,200 |
4,542 |
63 |
238 |
250 |
17 |
| 2" |
DN 50 |
2,350 |
8,892 |
120 |
473 |
250 |
17 |
| 3" |
DN 80 |
5,200 |
19,600 |
270 |
1,020 |
250 |
17 |
| 4" |
DN 100 |
5,200 |
19,600 |
270 |
1,020 |
250 |
17 |
| High-Flow |
1/2" |
DN 15 |
600 |
2,271 |
30 |
114 |
250 |
17 |
| 3/4" |
DN 20 |
600 |
2,271 |
30 |
114 |
250 |
17 |
| 1" |
DN 25 |
1,000 |
3,785 |
54 |
204 |
250 |
17 |
| High-Pressure |
1/4" |
DN 8 |
700 |
2,650 |
35 |
132 |
2000 |
138 |
| 3/8" |
DN 10 |
700 |
2,650 |
35 |
132 |
2000 |
138 |
| 1/2" |
DN 15 |
700 |
2,650 |
35 |
132 |
2000 |
138 |
| 3/4" |
DN 20 |
1,200 |
4,542 |
60 |
227 |
2000 |
138 |
| 1" |
DN 25 |
1,200 |
4,542 |
60 |
227 |
2000 |
138 |
