Primary Fluid Systems Inc. has introduces its Top Valve series of back pressure valves and pressure relief valves. New features include a completely adjustable pressure range of 0-150 PSIG 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, 1/4" to 2" NPT and eight (8) materials of wetted construction. The seat design of this new line of valves greatly extends the normal life expectancy of the diaphragm. Construction materials comprise PVC, CPVC, PVDF, Teflon, polypropylene, stainless steel, Alloy 20 and Hastelloy C.
