Pumps – Expansible chamber type – Distributor moved by separate fluid responsive surface
Patent
1993-11-10
1995-05-30
Bertsch, Richard A.
Pumps
Expansible chamber type
Distributor moved by separate fluid responsive surface
417432, 1375125, 251 635, F04B 702
Patent
active
054196892
ABSTRACT:
A vacuum pump which includes an oil pump for raising the pressure of oil in the vacuum pump during operation of the vacuum pump and an inlet valve for isolating the vacuum pump inlet during non-operation of the vacuum pump. The vacuum pump has an operating valve acting in an oil line between the oil pump and the inlet valve and in an oil line between the inlet valve and an oil reservoir. The operating valve is movable by means of oil pressure between a second position associated with vacuum pump operation in which the oil line between the inlet valve and the oil reservoir is closed and a first position associated with vacuum pump non-operation in which the oil line between the inlet valve and the oil reservoir is open. A means is provided to allow high pressure oil from the oil pump to communicate with the inlet valve in at least the second position.
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Bertsch Richard A.
Cassett Larry R.
Rosenblum David M.
The BOC Group plc
Wicker William J.
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