Pump system using a control fluid to drive a switching valve mechanism for an actuating fluid
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United States of America Patent
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-
Apr 5, 2005
Grant Date -
Oct 23, 2003
app pub date -
Nov 8, 2002
filing date -
Apr 19, 2002
priority date (Note) -
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status (Latency Note)
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Abstract
There is provided a pump system excellent in a maintenance ability and compatibility. The pump system comprises a pump (1) for transferring a liquid by alternately supplying air to air chambers (17a, 17b) to extend and contract a pair of bellows (13a, 13b) linked to a shaft (15). It also comprises a switching valve mechanism (2) for switching the air supplied to the pump (1). Switching mechanisms (40a, 40b) are employed to switch the pilot air for controlling the switching operation of the switching valve mechanism (2). The switching mechanisms are detachably attached to cases (16a, 16b) of the pump (1) from outside.
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