An accelerated life test was conducted on Furon HPVM valves, which were subjected to 1,500,000 cycles in Cabot Semi-Sperce® 12 slurry, by an independent test lab using the protocol of a major US OEM manufacturer.
Accelerated Life Test Method
Eight HPVM valves were assembled in two sets to allow two parallel flow paths through each set of 4 valves. Each set was cycled 2.5 seconds open and 2.5 seconds closed at room temperature with an actuator pressure of 70 psig. One set was opened as the other set was closed to maintain a constant flow of liquid through the system. The slurry Particle Sizing Distribution (PSD) was monitored on a daily bases. The slurry was considered to be in specification if the mean particle diameter was between 130 nm and 180 nm and if 99% of the distribution was inferior to 500 nm. As a result the slurry was replaced approximately every 150,000 cycles.