Air Injection Pump: Description and Operation

Fig. 5 Air Injection Pump With Integral Centrifugal Air Filter And Pressure Relief Valve:

Fig. 6 Air Injection Pump With Integral Centrifugal Air Filter W/O Pressure Relief Valve:

The air pump is a positive displacement unit that requires no maintenance, Fig. 5 and 6. The early units incorporated a replaceable element type air filter and pressure relief valve. Later units incorporate only a replaceable centrifugal type air filter. The pressure relief valve on early units is located in the exhaust cavity and encloses a preloaded spring, a seat and pressure setting lug.