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G-Series

Griffco G-series Griffco diaphragm back pressure valves and diaphragm pressure relief valves are designed to enhance the performance of chemical (dosing) pump systems by applying a continuous back pressure to the chemical feed pump, while also acting as an anti-syphon valve. The robust construction ensures reliability in heavy-duty industrial applications, among others. The G-series enables a higher flow compared to the M-series.

Liquid contact materials:

  • PVC
  • CPVC
  • PP
  • PVDF
  • PTFE
  • Halar®
  • SS 316L
  • Alloy 20
  • Hastelloy® C

Available sizes:

  • 1/2″ to 4″ or DN 15 to DN 100.

Features and benefits:

  • High reliability at an affordable price
  • Anti-syphon function
  • Solid, robust, (machined) construction
  • Wide range of materials
  • Flanged-, union-, threaded- and glue/weld options
  • Injection moulded Noryl top with integrated pressure lock
  • SS 316L metall valvetop option
  • Moulded PTFE / EPDM-diaphragm
  • Several materialoptions for diaphragms
  • Long lifetime diaphragm
  • Pressure adjustable up to 25 bar
  • 4 optional pressure ranges (springs)
  • Connection sizes from 1/2“ up to 4” of DN15 up to DN100
  • Tamper proof set screw
  • High temperature option up to 150˚C
  • Factory adjusted pressure or on site adjustable
Sizes, flowrange and pressure classifications
Sizes Max Flow Max pressure
Pulsing Continiously
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
Pressure relief valves
Back pressure valves