Primary Fluid Systems Inc. has introduced a new line of diaphragm style back pressure valves and pressure relief valves named Top Valve. New features include a completely adjustable pressure range of 15-150PSIG and a built-in air release to reduce priming difficulties with metering pumps.

Top Valve Back pressure valves and pressure relief valves are available in seven sizes, 1/4in through 2in NPT and eight materials of wetted construction. The seat design of this new line of valves extends the normal life expectancy of the diaphragm. The valve has a built-in air release and optional gauge port. It is available in PVC, CPVC, PVDF, polypropylene, Teflon, stainless steel, Alloy 20 and Hastelloy C.