Griffco High Flow Series

High-flow diaphragm pressure relief valves.


Griffco high-flow diaphragm pressure relief valves are designed to protect chemical transfer systems from overpressure damage caused by defective equipment or a blockage in the chemical feed line. Large orifice sizes facilitate high flows and 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:

  • Higher flow / lower pressure drop
  • High reliability at a low cost
  • Large orifice for high-viscosity fluids
  • 2-port design
  • Vent-able to suction line
  • Solid, robust, machined construction
  • Wide range of materials
  • Flanged and socket connection options
  • Molded Noryl top with integral hardware locking
  • Composite PTFE/EPDM diaphragm
  • Multiple diaphragm material options
  • Long diaphragm life
  • Adjustable up to 150 psi (10 bar)
  • Valve sizes from 1/2″ to 1″ or DN 15 to DN 25
  • Tamper-resistant adjustment screw
  • High-temperature option up to 300°F (149°C)

Griffco High Flow Pressure Relief Valve
Model Number Mfg. Connection Size/Type Material Price
PRHF050A Griffco 1/2" NPT Alloy 20 Call for Pricing
PRHF050C Griffco 1/2" NPT Hastelloy C Call for Pricing
PRHF050K Griffco 1/2" NPT PVDF Call for Pricing
PRHF050P Griffco 1/2" NPT PVC Call for Pricing
PRHF050PP Griffco 1/2" NPT Polypropylene Call for Pricing
PRHF050S Griffco 1/2" NPT 316 SS Call for Pricing
PRHF050T Griffco 1/2" NPT PTFE Call for Pricing
PRHF075CP Griffco 3/4" NPT CPVC Call for Pricing
PRHF075P Griffco 3/4" NPT PVC Call for Pricing
PRHF075PP Griffco 3/4" NPT Polypropylene Call for Pricing
PRHF075S Griffco 3/4" NPT 316 SS Call for Pricing
PRHF105P Griffco 1" NPT PVC Call for Pricing
PRHF105PP Griffco 1" NPT (5" diameter) Polypropylene Call for Pricing
PRHF105S Griffco 1" NPT 316 SS Call for Pricing