Plast-O-Matic Valves, Inc.

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.

Series PCWS multi-function assembly
The Series PCWS — dubbed the “stick”— is a multi-function assembly that incorporates the features of a pressure regulator, pressure gage, and shut-off valve into a single unit. This construction eliminates the need for multiple joints and pipe sections, reducing installation costs. The all-thermoplastic stick is designed specifically for process cooling water, and can be used in a variety of applications where corrosion is an issue. Available body materials are Geon polyvinyl chloride (PVC) or Corzan chlorinated polyvinyl chloride (CPVC), with ethylene propylene diene M-class rubber (EPDM) or fluoroelastomer (Viton) seals. The stick’s pressure regulator can be set to supply downstream pressure from 5 to 125 psi.

Valve Spigot Ends
These factory-installed spigot connections minimize vertical areas within pipes that are without flow (deadleg). They are constructed of ultra-pure, corrosion-resistant polypropylene or polyvinylidene fluoride (PVDF), and are designed for bead and crevice-free (BCF), infrared butt-fusion, and socket fusion piping. Available sizes are dimensionally compatible with piping from major manufacturers. An optional Class 100 cleanroom and double-bagging procedure can be used for ultra-pure applications.

Series TRVDT three-port, in-line relief valve
The Series TRVDT three-port, in-line relief valve is ideal for systems requiring minimal footprint or where the use of a piping tee is not practical. It has an economical, heavy-duty design that allows for easy replacement in existing systems. When closed, the valve has a straight-through flow pattern. The pressure setpoint is adjustable between 50 and 100 psi, and the maximum inlet pressure is 150 psi. Once the set pressure is reached, the diaphragm is lifted off the center port, and the excess liquid flows out through the third port at the bottom of the valve. The TRVDT model features a PTFE diaphragm seal with no wetted metals or elastomers. An additional non-wetted U-cup seal design includes the firm’s patented Fail-Dry vent, which provides visual warning of impending seal malfunction. The valves are available in 1⁄2-, 3⁄4-, and 1-in. pipe sizes, and can be made from PVC, natural polypropylene, PTFE and Kynar PVDF.

Relief Valve
This thermoplastic valve provides the rigidity and high purity required for lined pipe, eliminating the need for heavier and more costly linedmetal valves. The Teflon-diaphragm relief valve is equipped with an intrinsic flange, and features a plastic body, resulting in a non-leaching, contamination-free relief or bypass valve. The valve is available with an integral flange connection in Teflon, PTFE, Kynar PVDF, and natural, unpigmented polypropylene.

Shut-Off Valve is Suitable for Demanding Environments
With no wetted metals or external fasteners, this 1/2-in. air-operated shutoff valve can be used in high-purity or corrosive environments. Designed for liquid service at pressures ranging from full vacuum to 150 psi, the valve’s outlet pressure (backpressure) can be as high as the inlet pressure without affecting performance. The internal metal springs are isolated from the process liquid by redundant seals made of either Viton or EPDM. Body materials are polypropylene or polyvinyl chloride.