Parker Instrumentation has developed a PED-certified, proportional relief cock for process instrumentation applications, with the ability to provide protection over an extremely broad 150 to 6000 PSIG (10.3 to 414 bar) pressure range.

CE marked and certified to the highest Category-IV level of the Pressure Equipment Directive (PED) which covers a wide range of applications including hydraulic fluid power equipment, Parker will set and test the new valve at the factory for specific application pressures, and professional laser etch the valve body with the cracking pressure. The new valve provides a simple 'fit and forget' solution for adding reliable safety, environmental and/or equipment protection to a wide variety of process and laboratory instrumentation applications, that needs no testing or calibration by the end user.

Designated HPRV, the new valve is available with 0.142 inch/3.6 mm flow ports. At the heart of the innovation is a novel captured industrial seat design that is blow-out and chip-resistant and works across the entire operating pressure range (the valve will handle pressures up to 8000 PSIG/552 bar during relief). A range of colour-coded springs configure the valve for eight cracking pressure ranges of 150-375, 325-775, 725-1525, 1475-2275, 2225-3025, 2975-4025, 3975-5025 and 4975-6000 PSIG (10.3-24.1 to 345-414 bar). Fine adjustment can then be achieved by the end user by means of an external nut, which is secured in position by Parker's unique Tru-Loc mechanism and a lock wire to eliminate the possibility of accidental movement and guard against tampering.