Unloader and check valve

Details Unloader and check valve Unloader and check valve

1982-05-21

1984-09-11

Nilson, Robert G.

Fluid handling

Self-proportioning or correlating systems

Self-controlled branched flow systems

1375122, 417299, F04B 4908

Patent

active

044704283

ABSTRACT:
A combined unloading valve and check valve (10) for use with a motor driven air compressor. The unloading valve (16) includes a spool (30) axially movable within a tubular body (12). In the unloading position of the valve, one of two spaced-apart ring seals (32) on the spool is out of engagement with the body to open a flowpath from the inlet of the valve past the spool to exhaust ports (28) formed in the body. When the compressor is operating and the valve is pressurized, both ring seals engage the body to close off the flowpath. The check valve (18) extends beyond the end of the body and includes a poppet valve element (50) which engages a valve seat (52) formed on an end of the spool. When the unloading valve and check valve is installed in a wall (14) of an air tank the check valve extends into the air supply within the tank, thereby helping to cool the internal elements of the valve structure.

REFERENCES:
patent: 2820673 (1958-01-01), Zubaty
patent: 3358705 (1967-12-01), Krechel
patent: 3967635 (1976-07-01), Sealfon
patent: 4237918 (1980-12-01), German
patent: 4321940 (1982-03-01), Krechel

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