Unloader, and in combination with an air compressor inlet housin

Details Unloader, and in combination with an air compressor inlet housin Unloader, and in combination with an air compressor inlet housin

1987-07-06

1988-10-18

Freeh, William L.

Pumps

With condition responsive pumped fluid control

Inlet throttle or stop valve

251 62, 251 635, F04B 4902, F16K 31122

Patent

active

047783516

ABSTRACT:
The unloader has a piston-operated valving element which opens and closes a compressor, air inlet housing, inlet port to load and unload the associated compressor. A control, pressured air supply is addressed to the piston to cause the latter to translate the valving element into port closure, and in the absence of the aforesaid supply, vacuum pressure and incoming air displace the valving element from closure of the ports. One spring seats the piston, and another moves the valving element into closure when the compressor is shut down, in one embodiment of the invention. A guide rod pilots movements of the piston and valving element. In the combination, the unloader is wholly confined within an aluminum die-cast air inlet housing.

REFERENCES:
patent: 2913005 (1959-11-01), Grant et al.
patent: 2926883 (1960-01-01), Prybylski et al.
patent: 3141386 (1964-07-01), Loughridge
patent: 4270885 (1981-06-01), Schneffer et al.
patent: 4362475 (1982-12-01), Seitz
patent: 4473093 (1984-09-01), Hart
patent: 4523516 (1985-06-01), Foster et al.

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