Pressure Control & Relief Valves

The thermoplastic pressure relief valve protects equipment and systems against over-pressures or sudden pressure surges. Able to handle highly corrosive or ultra-pure liquids, the relief valve prevents pumps from dead-heading due to unexpected shut-offs downstream (also known as a bypass relief valve). It maintains back pressure in closed-loop systems to make pumps run more smoothly (also known as a back pressure valve).

Standard Sizes

1/4" - 4" diameter

Sizes and materials are brand specific. Click on a manufacturer below for available products. Please contact Aetna Plastics for pricing information.

To view material Corrosion Guides, visit our Technical Specifications page.

The General Application Diagram.pdf illustrates where valves are used in a flow system.


  • Size Range: 1/2" - 4"
  • Materials: PVC, PP, PVDF and PTFE
  • Products: T-241 Regulator, Frank Series Regulators
Georg Fischer
  • Size Range: 3/8" - 2"
  • Materials: PVC, CPVC, PP, & PVDF
  • Products: Type 582, Type 586, V-Series Pressure Regulators
  • Size Range: 1/4" - 2"
  • Materials: PVC, CPVC, PP and PVDF
  • Products: RV Series Pressure Relief, PBV Series Pressure Valve, RPV Series Pressure Valve and RR Series Regulator Valves
  • Size Range: 1/4" - 3"
  • Materials: PVC, CPVC, PP, PVDF and PTFE
  • Products: Series PR, Series PRHU, Series UPR, Series PRD, Series PRA, Series PRS Pressure Regulators
RK Industries
  • Size Range: 1/4" - 4"
  • Materials: PVC, PP, PVDF and PTFE
  • Products: Series MRB, Series DRV, Series NLR, Series NLB, Series SBR, Series PBP Valves