The 1968 AIR non-pressure relief valve pumps were coded Z. Most 1969 and later pumps without a pressure relief valve are coded S. Corvette Air Injection Smog Pump Fans. See All 11 Photos.

Intake pressure relief valves or relay reliefs intended to reduce possibility of damage to pump and ... Pump discharge pressure increases as throttle setting on relay pumper increased; ...

Refrigeration Valves & Pumps Ice Breaker: Relief Valves 101 Safety Device Helps Protect Equipment, Workers. By Joe Marchese. November 4, 2013. ... Pressure relief valves are designed to re-close as ...

Further, the Alfa Laval Unique SSV pressure relief valve helps protect hygienic processing lines from overpressure, particularly those lines that incorporate positive displacement pumps.