Low flow diaphragm back pressure valves apply a pre-set back pressure to the chemical feed pump.


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: 1/4″ to 1/2″ or DN 8 to DN 15

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 (24 bar)
  • 4 optional pressure ratings (springs)
  • Valve sizes from 1/4″ to 1/2″ or DN 8 to DN 15
  • Tamper-resistant adjustment screw
  • High-temperature option up to 300°F (149°C)
  • Factory or field settable

Model NumberMfg.DescriptionConnection Size/TypeMaterial
BPM025AGriffcoM-Series Back Pressure Valve1/4" NPTAlloy 20
BPM025CGriffcoM-Series Back Pressure Valve1/4" NPTHastelloy C
BPM025CPGriffcoM-Series Back Pressure Valve1/4" NPTHastelloy C
BPM025KGriffcoM-Series Back Pressure Valve1/4" NPTPVDF
BPM025PGriffcoM-Series Back Pressure Valve1/4" NPTPVC
BPM025PPGriffcoM-Series Back Pressure Valve1/4" NPTPolypropylene
BPM025SGriffcoM-Series Back Pressure Valve1/4" NPTStainless Steel
BPM025TGriffcoM-Series Back Pressure Valve1/4" NPTPTFE
BPM038AGriffcoM-Series Back Pressure Valve3/8" NPTAlloy 20
BPM038CGriffcoM-Series Back Pressure Valve3/8" NPTHastelloy C
BPM038CPGriffcoM-Series Back Pressure Valve3/8" NPTHastelloy C
BPM038KGriffcoM-Series Back Pressure Valve3/8" NPTPVDF
BPM038PGriffcoM-Series Back Pressure Valve3/8" NPTPVC
BPM038PPGriffcoM-Series Back Pressure Valve3/8" NPTPolypropylene
BPM038SGriffcoM-Series Back Pressure Valve3/8" NPTStainless Steel
BPM038TGriffcoM-Series Back Pressure Valve3/8" NPTPTFE
BPM050AGriffcoM-Series Back Pressure Valve1/2" NPTAlloy 20
BPM050ASGriffco1/2" M-Series Back Pressure ValveSocketAlloy 20
BPM050CGriffcoM-Series Back Pressure Valve1/2" NPTHastelloy C
BPM050CPGriffcoM-Series Back Pressure Valve1/2" NPTCPVC
BPM050CPSGriffco1/2" M-Series Back Pressure ValveSocketCPVC
BPM050CSGriffco1/2" M-Series Back Pressure ValveSocketHastelloy C
BPM050KGriffcoM-Series Back Pressure Valve1/2" NPTPVDF
BPM050KSGriffco1/2" M-Series Back Pressure ValveSocket (Fusion)PVDF
BPM050PGriffcoM-Series Back Pressure Valve1/2" NPTPVC
BPM050PPGriffcoM-Series Back Pressure Valve1/2" NPTPolypropylene
BPM050PPSGriffco1/2" M-Series Back Pressure ValveSocket (Fusion)Polypropylene
BPM050PSGriffco1/2" M-Series Back Pressure ValveSocketPVC
BPM050SGriffcoM-Series Back Pressure Valve1/2" NPTStainless Steel
BPM050SSGriffco1/2" M-Series Back Pressure ValveSocketStainless Steel
BPM050TGriffcoM-Series Back Pressure Valve1/2" NPTPTFE