High-Flow Back Pressure Valves from Griffco

griffco high-flow series, back pressure valves, diaphragm pressure valves, griffco

Griffco High-Flow 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. Larger orifice size makes the valves ideal for use with higher viscosity fluids.

Wetted Materials:

  • PVC

  • CPVC

  • PP

  • PVDF

  • PTFE

  • 316 SS

  • Alloy 20

  • Hastelloy®C

Available Sizes:

1/2", 3/4" & 1" or DN 15, DN 20 & DN 25

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 250 psi (17 bar)

  • 4 optional pressure ratings (springs)

  • Valve sizes from 1/2" to 1" or DN 15 to DN 25

  • 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
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


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