G Series

PRV with medium to large connections (1/2" to 4" or DN 15 to DN 100)


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
  • 2-port and 3-port configurations (90° and 180°)
  • 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 (24 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

Model NumberMfg.Connection Size/TypeMaterial
PRG050AGriffco1/2" NPTAlloy 20
PRG050ASGriffco1/2" SocketAlloy 20
PRG050CPGriffco1/2" NPTCPVC
PRG050CPSGriffco1/2" SocketCPVC
PRG050KGriffco1/2" NPTPVDF
PRG050KSGriffco1/2" Fusion SocketPVDF
PRG050PGriffco1/2" NPTPVC
PRG050PPGriffco1/2" NPTPolypropylene
PRG050PSGriffco1/2" SocketPVC
PRG050SGriffco1/2" NPT316 SS
PRG050SSGriffco1/2" Socket316 SS
PRG050TGriffco1/2" NPTPTFE
PRG075AGriffco3/4" NPTAlloy 20
PRG075ASGriffco3/4" SocketAlloy 20
PRG075CPGriffco3/4" NPTCPVC
PRG075CPSGriffco3/4" SocketCPVC
PRG075KGriffco3/4" NPTPVDF
PRG075KSGriffco3/4" SocketPVDF
PRG075PGriffco3/4" NPTPVC
PRG075PPGriffco3/4" NPTPolypropylene
PRG075PSGriffco3/4" SocketPVC
PRG075SGriffco3/4" NPT316 SS
PRG075SSGriffco3/4" Socket316 SS
PRG075TGriffco3/4" NPTPTFE
PRG100AGriffco1" NPTAlloy 20
PRG100ASGriffco1" SocketAlloy 20
PRG100CPSGriffco1" SocketCPVC
PRG100KGriffco1" NPTPVDF
PRG100KS31Griffco1" SocketPVDF
PRG100PGriffco1" NPTPVC
PRG100PPGriffco1" NPTPolypropylene
PRG100PSGriffco1" SocketPVC
PRG100SGriffco1" NPT316 SS
PRG100SSGriffco1" Socket316 SS
PRG100TGriffco1" NPTPTFE
PRG155AGriffco1 1/2" NPTAlloy 20
PRG155ASGriffco1 1/2" SocketAlloy 20
PRG155CGriffco1 1/2" NPTHastelloy C
PRG155CPGriffco1 1/2" NPTCPVC
PRG155KGriffco1 1/2" NPTPVDF
PRG155KSGriffco1 1/2" SocketPVDF
PRG155PGriffco1 1/2" NPTPVC
PRG155PSGriffco1 1/2" SocketPVC
PRG155SGriffco1 1/2" NPT316 SS
PRG155SSGriffco1 1/2" Socket316 SS
PRG155TGriffco1 1/2" NPTPTFE
PRG200AGriffco2" NPTAlloy 20
PRG200CGriffco2" NPTHastelloy C
PRG200KGriffco2" NPTPVDF
PRG200PGriffco2" NPTPVC
PRG200PPGriffco2" NPTPolypropylene
PRG200PSGriffco2" SocketPVC
PRG200SGriffco2" NPT316 SS
PRG200SSGriffco2" Socket316 SS
PRG200TGriffco2" NPTPTFE
PRG300PGriffco3" FlangedPVC