Diaphragm Back Pressure Valves G-Series from Griffco


Griffco G-Series 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:

  • PVC

  • CPVC

  • PP

  • PVDF

  • PTFE

  • Halar®

  • 316 SS

  • Alloy 20

  • Hastelloy® C

Available Sizes:

  • 1/2" to 4" or DN 15 to DN 100

Features & Benefits:

  • High reliability at a low cost

  • Anti-siphon function

  • Solid, robust, machined construction

  • Wide range of materials

  • Flanged, union, threaded and socket connection options

  • Molded Noryl top with integral hardware locking

  • 316L metal valve and top options

  • Molded PTFE/EPDM diaphragm

  • Multiple diaphragm material options

  • Long diaphragm life

  • Adjustable up to 350 psi (25 bar)

  • 4 optional pressure ratings (springs)

  • Valve sizes from 1/2" to 4" or DN 15 to DN 100

  • Tamper-resistant adjustment screw

  • High-temperature option up to 300ºF (149ºC)

  • Factory or field settable

Download Technical Data Sheet: Imperial (US) | Metric (International)

Sizes, Flow Capacities & Pressure Ratings
Size Maximum Flow Maximum Pressure
Pulsating Continuous
Inch Metric GPH LPH GPM LPM PSI BAR
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

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