Plast-O-Matic Valves, Inc. has introduced an automatic valve that performs multiple functions in a piping system, including pressure relief, backpressure control, pump bypass, and anti-siphon protection.
The Plast-O-Matic Valves product has applications in water/wastewater pump control, backpressure control in ultrapure water & chemical distribution systems, pressure relief in liquid piping systems, and siphon prevention in potable water treatment.
The design features a non-wetted 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 is invaluable in providing backpressure on a pump, or backpressure to maintain flow to points of use, the company says.
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. Series RVDT is offered in pipe sizes ¼ through 4 in., 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.