A&F MACHINE PRODUCTS CO.

                                 Manufacturer of Helwig Chemical Feed Pumps and related water treatment equipment    
 

 

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PRESSURE RELIEF & ANTI-SIPHON VALVES

Pressure Relief Valves are necessary to protect equipment from damage and protect operators from hazards due to excessive pressure. The Pressure Relief Valve should be installed in a tee in the discharge line from the pump as close to the pump as possible. The Pressure Relief Valve must be set to by-pass at a pressure low enough to protect the weakest point in the system. The outlet of the Pressure Relief Valve should be piped back to the supply tank, pump suction, or a drain. All V-5, V-10, and V-10-H pumps are supplied with a Pressure Relief Valve for each head.

Anti-Siphon Valves are used in a situation where there is a possibility of chemical being siphoned through the pump. This can happen if the point of injection to the system is below the level of the supply tank or into the suction side of a feed pump. The Anti-Siphon Valve will insure positive head pressure to reduce or eliminate the possibility of siphoning chemical through the pump.

PRV Installation PDF