Intake control valve

Details Intake control valve Intake control valve

1993-06-01

1995-05-02

Bertsch, Richard A.

Pumps

With condition responsive pumped fluid control

Inlet throttle or stop valve

417298, 1374925, 137907, 251 83, F04B 4900

Patent

active

054113750

ABSTRACT:
An intake control valve for a screw-type compressor is built into the intake line, which it alternatingly opens or closes. The intake control valve, designed as a double seat valve, has a locking body (17), to which are assigned two opposing valve seats, namely a return flow seat (7) and an intake seat (9). Upon starting the screw-type compressor, the locking body (17) is pulled onto the intake seat (9) by means of the resulting intake pressure. As soon as a specific operating pressure is reached, the locking body (17) is lifted from the intake seat (9) by means of the pressure medium by way of a control cylinder (10) with a control piston (11) and moved into an intermediate position between its two seats (7, 9), so that the screw-type compressor can totally transport. As soon as the screw-type compressor is turned off, a weak spring (18) braced against the valve housing (1) pushes the locking body (17) onto the return flow seat (7) and closes it sealingly, so that neither pressure medium nor oil injected for lubricating the screw-type compressor can flow back into the intake line.

REFERENCES:
patent: 862867 (1907-08-01), Eggleston
patent: 3982561 (1976-09-01), Harthun
patent: 4708599 (1987-11-01), Suzuki
patent: 4826134 (1989-05-01), Chapman
patent: 4968221 (1990-11-01), Noll

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