Plast-O-Matic Valves’ new series TRVDT three-port, in-line relief valve is suitable for systems requiring minimal footprint or where the use of a piping tee is not practical. When closed, the valve has a straight-through flow pattern. The pressure set-point is infinitely adjustable between 50PSI and 100PSI, with a maximum inlet pressure of 150PSI. Once the set pressure is reached, the diaphragm is lifted off the centre port, and the excess liquid flows out through the third port at the bottom of the valve. The valve features a PTFE diaphragm seal with no wetted metals or elastomers. This diaphragm allows the valve to support highly aggressive, corrosive liquids. The large area of the diaphragm makes for higher sensitivity and a lower pressure drop with high-flow conditions. An additional non-wetted, u-cup seal design includes the patented fail-dry vent, which provides visual warning of impending seal malfunction. This allows the valve to continue operating until maintenance can be performed on the system. Valves are available in pipe sizes of 1/2”, 3/4”, and 1in. in PVC, natural polypropylene, PTFE, and Kynar PVDF.
