Corrosion Resistant Anti-Siphon Valves

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Both plastic and metal body designs feature the same external and internal dimensions, providing the ultimate flow performance. Please click here for a photographic comparison of the inner workings of Series RVDT vs. competitor’s BPV: Not all Backpressure Valves are Created Equal!

Corrosion Resistant Anti-Siphon Valves
Plast-O-Matic Valves, Inc. now offers Anti-Siphon Valves to protect chemical process systems from unwanted tank siphoning, permitting flow only under controlled pumping.
Plast-O-Matic Valves, Inc. has introduced a line of thermoplastic Anti-Siphon Valves to prevent undesirable flow of corrosive and ultra-pure liquids.
Used mainly to prevent gravity-induced siphonage from storage tanks, the Series RVDT remains closed under the pressure created by the presence of liquid in a tank in piping system but remains closed under the pressure created by the presence of liquid in a tank and piping system but opens under pump pressure. In chemical process applications, the anti-siphon valve is frequently used to protect a system from unwanted flow through a pump due to negative pressure in a pipeline. The Plast-O-Matic RVDT actually closes tighter under the presence of vacuum at the valve outlet; yet it opens and allows chemicals to enter the system under controlled pumping.
The pressure set-point is infinitely adjustable, but a low set-point is common for most anti-siphon applications. Once the set pressure is reached, the valve begins to open. It will allow the rated full flow at approximately 40% over the set pressure.
Anti-Siphon Valves are usually installed directly in the chemical feed line near the outlet of the pump. Typically, this allows the valve to be preset to open at the lowest practical pressure that prevents siphoning, and permit flow at a lower pumping pressure.
The Commonwealth of Massachusetts has approved the valve for use in municipal and other public water facilities to prevent chemical siphoning during a shut-down, specifically in applications where a vacuum can decan develop due to changes in elevation. It is the first thermoplastic anti-siphon valve approved for this use.
Anti-Siphon Valves are available in pipe sizes from ¼”-2” with various body materials including Grade 1, Type 1 PVC, Polypropylene, Corzan (CPVC), Kynar (PVDF) and Teflon (PTFE). Primary Seal is a Teflon diaphragm. Flow rates range from 2 to 75 GPM and set pressures from 5 to 150 PSI. The valves can be factory modified for special applications.

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Plast-O-Matic Valves, Inc.
When it comes to thermoplastic valves and controls, we are the problem solvers.
Founded in 1967, Plast-O-Matic Valves' ongoing mission is to provide unparalleled customer satisfaction while continually advancing the technology of liquid pressure and flow control. As the quality leader in the development of thermoplastic valves and controls for corrosive and ultra-pure liquids, POM provides a complete line of standard and custom designed solutions for difficult applications. The company is committed to product innovation, engineering excellence, precision manufacturing, 100% quality testing, and hands-on technical assistance. ISO 9001:2015 Registered.

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