Automatic valve performs multiple functions in a piping system, including pressure relief, backpressure control, pump bypass and anti-siphon protection. The 0.5" size, lug-mounted Series RVDT uses an adjustable nonwetted spring to control backpressure. The setpoint is adjustable, and once the set pressure is reached, the valve begins to open. It will allow the rated full flow at approximately 40 percent over the set pressure. This operation enables the valve to provide a controlled obstruction in a piping system as needed. It also can be employed to open and relieve 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.

Plast-O-Matic Valves Inc., (973) 256-3000