Corrosion Resistant Anti-Siphon Valves
Summary: 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.
Cedar Grove, New Jersey: 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.
For further information, contact:
Plast-O-Matic Valves, Inc., Cedar Grove, NJ 07009
Phone: 973-256-3000 Fax: (973) 256- 4745
Email: info@plastomatic.com