Compressor start control and air inlet valve therefor

Details Compressor start control and air inlet valve therefor Compressor start control and air inlet valve therefor

1993-03-10

1995-02-14

Bertsch, Richard A.

Pumps

With condition responsive pumped fluid control

Inlet throttle or stop valve

251 634, F04B 4900

Patent

active

053889673

ABSTRACT:
A start control for a compressor has an air inlet valve for reducing flow intake when a compressor is started. The valve has a housing with an inlet and an outlet which is connected to a compressor. A rod in the housing is movable relative to the housing and has a shoulder and a piston. A movable plate is mounted on the rod and a spring is interposed between the plate and the housing for biasing the plate toward a closed position in which the housing inlet is at least partially closed. A second spring is interposed between the piston and the housing for moving the shoulder into engagement with the plate and biasing the plate toward the closed position. The housing has a chamber on each side of the piston for receiving air that discharges from the compressor. Air pressure applied to one side of the piston assists the first spring and the second spring move the plate toward the closed position when the compressor is in a start mode of operation. Air pressure applied to a second side of the piston opposes the second spring and reduces bias on the plate whereby the plate is permitted to move away from the closed position when the compressor is in a run mode of operation.

REFERENCES:
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patent: 2997227 (1961-08-01), Ternent
patent: 3260444 (1966-07-01), Williams et al.
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patent: 4068980 (1978-01-01), Fine et al.
patent: 4406589 (1983-09-01), Tsuchida et al.
patent: 4708599 (1987-11-01), Suzuki
patent: 4815950 (1989-03-01), Aoki et al.
patent: 4968221 (1990-11-01), Noll
patent: 5009576 (1991-04-01), Gagnet

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