Furon HPVM valves, normally closed, have been tested for reliability in 37% hydrochloric acid (HCl) by an independent test lab using the protocol of a major US OEM manufacturer.
Accelerated Life Test Method
Eight HPVM valves were assembled in a manifold allowing two parallel flow paths through each set of 8 valves. Each set was cycled 3 seconds open and 3 seconds closed at room temperature with an actuator pressure of 80 psig. One set was opened as the other set was closed to maintain a constant flow of acid through the system at 74-80 psig. Flow was provided by a double diaphragm pump from a 4-gallon acid reservoir. Valves were inspected every workday for leaks. The accelerated life test was performed on a set of eight valves in 37% HCl. Cleanroom-grade HCl were used. HCl was added regularly during this test to ensure full chemical strength was maintained.