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Technical Articles
October 10, 2018

Angle Pattern Relief/Bypass/Backpressure Valves Series RVT


series rvt relief valve

  • Offered in Geon® PVC, Corzan® CPVC, PTFE, Kynar® PVDF & Natural Polypropylene
  • 1/2″, 3/4″, 1″, 1 1/2″ and 2″ sizes
  • 1 1/4″ size available in PVC & CPVC
  • Protect systems and equipment from dangerous overpressures.
  • For use as back pressure valve, straight relief, by-pass relief or back pressure regulator.
  • Offer wide range of pressure settings from 5-125 PSI (0.4-8.6 BAR) with sensitive operation.
  • Designed with a PTFE shaft for non-sticking operation.
  • Triple U-cup seal isolates spring, provides added safety.
  • Patented Fail-Dry® advance warning vent allows maintenance to be scheduled conveniently.
  • Provide minimum maintenance through simple and efficient design.



     Film Click here for brief video of how a relief valve works.





PRODUCT UPDATE AUGUST 2005: New Body Style for Series RVT in PVC

For decades the RVT in PVC has been a hand-constructed valve based on a molded schedule 80 tee. We would modify the stock tee, then assemble and weld a number of parts within the tee to build the valve body. In materials such as PTFE, natural polypro and PVDF, the valve body was always machined out of solid stock. Although the two types of bodies looked markedly different, valve performance was identical.

In recent years, however, improvements in our machine shop have given us the capability to produce a number of items more economically. Machining efficiency and technology have been continuously upgraded under the direction of Pete Colantuono, Shop Supervisor. Because of these advances, the process of machining RVT bodies out of solid stock is nearly as economical as hand construction using molded tees.

Because of the machining repeatability and obvious strength of the solid body design, we’ve begun to manufacture RVT bodies in PVC from solid stock.

What this means to you…

  • Price remains the same.
  • The new look is simply a new method of construction. It is identical internally and provides the same flow, performance, and reliability.
  • The new dimensions for Series RVT in PVC are the same as the existing dimensions for RVT in natural polypro, PVDF and PTFE.
  • Seal kits are identical for both designs. If you have both “tee” body valves and solid body valves installed, replacement springs and seal kits are completely interchangeable (within the same size, of course).

You should also be aware that some of the tee body valves are still in the channel – both in distributor stock and our factory stock. As a result, you may continue to see the tee valves in various sizes.

Finally, please note that the Corzan CPVC in 1 1/4″, 1 1/2″ and 2″ sizes of Series RVT will be manufactured with the tee body design for the foreseeable future. 

Flow Rate Reference Charts

½”, ¾” and 1″ Flow Characteristics

1¼”, 1½” and 2″ Flow Characteristics

Series RVT Dimensions

Plastic pressure relief valves are multi-functional, normally-closed valves for system pressure relief, pump protection, enhancing pump performance, by-pass relief, and balancing pressure in a process system.

For anti-siphon applications, Plast-O-Matic Series RVDT features a unique PTFE diaphragm. For installations with limited space does not permit mounting off a piping tee, please refer to Plast-O-Matic Series TRVDT three-port relief valve.

Available in PVC, CPVC, Kynar PVDF, Natural Polypropylene, PTFE, and glass-filled Polypropylene; sizes 1/4″ to 3″ NPT.

Ideal for corrosive and other chemical process, as well as deionized water, reverse osmosis water…any ultra-pure liquid.

Plast-O-Matic relief valves deliver higher flow at lower overpressures than other typical relief valves. Operation is smooth, sensitive and extremely accurate.






Seals Body Materiel 
RVT050 1/2″  20mm Viton PV
RVT 075 3/4″ 25mm Viton PV-PVC
RVT125 1 1/4″ 40mm Polypro
RVT150 1 1/2″ 50mm PVDF/Kynar
RVT200 2″ 63mm TF-PTFE

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