Multipurpose Backpressure Valve Uses Adjustable Nonwetted Spring

Plast-O-Matic Valves Inc. has introduced a new automatic valve that performs multiple functions in a piping system, including pressure relief, backpressure control, pump bypass and antisiphon protection.  

The new, half-inch  lug-mounted Series RVDT uses an adjustable nonwetted spring to control backpressure in a piping system. The set-point is adjustable, and 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. This operation enables the valve to provide a controlled obstruction in a piping system as needed. This helps provide backpressure on a pump or backpressure to maintain flow to points of use. It can also be employed to open and relieve dangerous pressure in a system. 

These same characteristics enable the valve to remain closed in the event of downstream vacuum, and prevent siphoning of hazardous chemicals. All wetted materials are thermoplastic. The metal spring is isolated from the process liquid by a PTFE diaphragm.  The ½” lug-mounted RVDT is offered in body materials of Geon PVC, natural polypropylene, Corzan CPVC  and Kynar PVDF. Pressure can be set infinitely from 5 to 150 PSI. The valves can be factory modified for special applications.