Griffco Unibody Relief

Leak-free reliability in the rigorous service of municipal and industrial applications.


The Unibody back pressure valve ensures leak-free connections and operation. This design allows flexibility of changing connection types, provides ease of maintenance and eliminates additional system components (extra unions) saving time and money. As with all of the Griffco designs, the chemical feed system is safeguarded by applying continuous back pressure to the chemical feed pump, while also acting as an anti-siphon valve.

Wetted Materials:


Available Sizes:

1/2″ to 1″ or DN 15 to DN 25

Features & Benefits:

  • Solid, robust, single-piece machined construction
  • No seals or glued connections
  • Compact size for OEM applications
  • High reliability at a low cost
  • Anti-siphon function
  • Available in PVC and CPVC
  • Union-style connections
  • Molded Noryl top with integral hardware locking
  • Vulcanized composite PTFE/EPDM diaphragm
  • Multiple diaphragm material options
  • Long diaphragm life
  • Adjustable up to 150 psi (10 bar)
  • 4 optional pressure ratings (springs)
  • Valve sizes from 1/2″ to 1″ or DN 15 to DN 25
  • Tamper-resistant adjustment screw

Griffco Unibody Pressure Relief Valves
Model Number Mfg. Connection Size/Type Material Price
PRU050CP Griffco 1/2" Union CPVC Call for Pricing
PRU050P Griffco 1/2" Union PVC Call for Pricing
PRU075CP Griffco 3/4" Union CPVC Call for Pricing
PRU075P Griffco 3/4" Union PVC Call for Pricing
PRU100P Griffco 1" Union PVC Call for Pricing