Intake control valve
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United States of America Patent
Stats
-
May 2, 1995
Grant Date -
N/A
app pub date -
Jun 1, 1993
filing date -
Jun 2, 1992
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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