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Technical Articles
October 10, 2018

RVDM- In-Line Relief Valves




  • Rolling Diaphragm Eliminates Crystallization Problems.
  • Fail-Dry Patented Safety Design.
  • Sensitive Smooth Operation.
  • All Plastic Adjusting Screw.
  • 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 5-120 PSI with sensitive operation.
  • 5 to 100 PSI (0.4 to 6.9 bar) Setting Range – 120 PSI (8.3 bar) on1/2 in. size.


Flow Reference Chart:




Plastic pressure in-line 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.

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.


Please refer to Catalog RVDM

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