Pressure Relief Valves from Griffco - Vissers Sales Corp.
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Pressure Relief Valves from Griffco

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)
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Category:

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
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)
 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
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
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