High-Flow diaphragm back pressure valves apply a pre-set back pressure in a chemical system.


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 300°F (149°C)
  • Factory or field settable

Model NumberMfg.DescriptionConnection Size/TypeMaterial
BPHF050AGriffcoHigh Flow Back Pressure Valve1/2" NPTAlloy 20
BPHF050CGriffcoHigh Flow Back Pressure Valve1/2" NPTHastelloy C
BPHF050CPGriffcoHigh Flow Back Pressure Valve1/2" NPTCPVC
BPHF050KGriffcoHigh Flow Back Pressure Valve1/2" NPTPVDF
BPHF050PGriffcoHigh Flow Back Pressure Valve1/2" NPTPVC
BPHF050PPGriffcoHigh Flow Back Pressure Valve1/2" NPTPolypropylene
BPHF050SGriffcoHigh Flow Back Pressure Valve1/2" NPTStainless Steel
BPHF050TGriffcoHigh Flow Back Pressure Valve1/2" NPTPTFE
BPHF075CPGriffcoHigh Flow Back Pressure Valve3/4" NPTCPVC
BPHF075KGriffcoHigh Flow Back Pressure Valve3/4" NPTPVDF
BPHF075PGriffcoHigh Flow Back Pressure Valve3/4" NPTPVC
BPHF075PPGriffcoHigh Flow Back Pressure Valve3/4" NPTPolypropylene
BPHF075SGriffcoHigh Flow Back Pressure Valve3/4" NPTStainless Steel
BPHF100KGriffcoHigh Flow Back Pressure Valve1" NPTPVDF
BPHF105CPGriffcoHigh Flow Back Pressure Valve1" NPTCPVC
BPHF105KGriffcoHigh Flow Back Pressure Valve1" NPTPVDF
BPHF105PGriffcoHigh Flow Back Pressure Valve1" NPTPVC
BPHF105PPGriffco1" High Flow Back Pressure ValveNPT (5" Diameter)Polypropylene
BPHF105SGriffco1" High Flow Back Pressure ValveNPT (5" Diameter)Stainless Steel