Unloader and check valve

Details Unloader and check valve Unloader and check valve

1979-05-21

1980-12-09

Schwadron, Martin P.

Fluid handling

Self-proportioning or correlating systems

Self-controlled branched flow systems

417299, G05D 1100

Patent

active

042379180

ABSTRACT:
A combined unloader and check valve for use with a motor driven air compressor (70) in which pressure trapped in the compressor head when the compressor is shut down is unloaded by means of an unloaded valve element (44) which opens a port (26) to unload the head pressure to atmosphere through an exhaust port (62) in response to the closing of a check valve element (34) in the compressor outlet line. When the compressor is operating and the check valve is open, pressure above the unloading valve element keeps the unloading valve element in position to shut off flow through the exhaust port. Air trapped above the unloader valve element when the check valve is initially closed is bled off through a filter element (52). In a preferred embodiment of the invention, the unloader valve element (144) is in the form of a diaphragm. The filter element (52) can be a compressible material to permit adjustment of the bleed rate therethrough by varying the density thereof by means of an adjustable bleed screw (48).

REFERENCES:
patent: 3195319 (1965-07-01), Wolff
patent: 3358705 (1967-12-01), Krechel
patent: 3545887 (1970-12-01), Kobnick
patent: 3606908 (1971-09-01), Riester
patent: 3999568 (1976-12-01), Chapman
patent: 4061271 (1977-12-01), Kimbrough
patent: 4114637 (1978-09-01), Johnson

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