Driving device, in particular for a proportioning pump of the piston-flowmeter type
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United States of America Patent
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-
Nov 22, 1988
Grant Date -
N/A
app pub date -
Aug 22, 1986
filing date -
Sep 5, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In a driving device of the piston-flowmeter type, in particular for a proportioning pump, a distributor is mounted at one end of a piston cylinder for controlling the admission and discharge of fluid within two chambers formed respectively on each side of the piston. The distributor body is provided with circular flow passages and two pairs of valve-seats in cooperating relation with two seals of a two-position tubular valve. The valve has a central bore traversed by the piston rod and coupled to a resilient bistable mechanism for reversing the state of the valve and maintaining it in either of its two positions.
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