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Griffco G-Series Back Pressure Valves

3d-star 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 20bpv-g
  • 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 300˚F (149˚C)
  • 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 15 320 1,211 17 63 350 24
3/4" DN 20 367 1,389 19 72 350 24
1" DN 25 462 1,798 24 90 350 24
1-1/2" DN 40 1,388 5,254 72 275 250 17
2" DN 50 1,533 5,803 80 302 250 17
3" DN 80 5,157 19,521 270 1,020 250 17
4" DN 100 5,157 19,521 270 1,020 250 17