Series RVDT automatic valve

The lug-mounted Series RVDT automatic valve performs multiple functions, including pressure relief, backpressure control, pump bypass, and anti-siphon protection. It uses an adjustable nonwetted spring to control backpressure in liquid piping systems. The setpoint is adjustable, and once the set pressure is reached, the valve begins to open. This operation enables the valve to provide a controlled obstruction in a piping system, as needed, which is useful for providing backpressure on a pump or backpressure to maintain desired flow to downstream points of use. All wetted components are available in a variety of thermoplastic materials, including polyvinyl chloride (PVC), chlorinated PVC (CPVC), polypropylene, and polyvinylidene fluoride (PVDF); the metal spring is isolated from the process liquid by a polytetrafluoroethylene (PTFE) diaphragm. Pressure can be set from 5 to 150 psi, and factory modifications can be made for special applications.