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Relief, By Pass, Back Pressure and Anti-Siphon Valves

Angle and in-line designs for corrosive chemicals, water and ultra-pure liquids

The Plastomatic series of relief valves features a solid, nonsticking PTFE shaft passing through three U-cup seals with a proven, high performance relief valve providing rugged dependability for acids and other highly corrosive liquids. True Blue ® Relief Valves provide smooth, sensitive operation to help you manage pressure “upstream” of the valve.


This valve design serves many functions:

  • Preventing overpressure conditions in vessels and piping systems (relief valve).
  • Providing by-pass flow relief to avoid pumping problems such as deadheading (pump bypass valve).
  • Maintain backpressure in a piping system (backpressure regulator).
  • Enhance pump performance by maintaining backpressure on the pump outlet (pump backpressure valve).
  • Prevent gravity-induced siphoning through a pump, opening only when the pump is on (anti-siphon valve).
  • NEW! Series TRVDT 3-port design…the features of our state-approved RVDT now in a 3-way valve!

And provides many outstanding features:

  • Offer wide range of pressure settings with sensitive operation.
  • Provide smooth operation with higher flow.
  • Fail-Dry safety feature (not available on RVD or RVTX).
  • Each valve is individually tested prior to shipment.
  • No wetted metals; all external fasteners are stainless steel.
  • Maintenance-free designs.
  • Designs for crystallizing liquids.
  • Designs with no wetted elastomers for ultra-pure chemicals and water.
  • Non-contaminating PTFE diaphragm designs.
  • Factory pre-set if requested.
  • Tamper-proof option.

Enquire about this product

Send a message to the Chem Resist sales team for more information.

Alternatively, contact Neil Williams on +44 1924 499466 or enquiry@chemresist.com.

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