Air shift conversion apparatus for manual valves
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United States of America Patent
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-
Apr 29, 1986
Grant Date -
N/A
app pub date -
Aug 28, 1984
filing date -
Aug 28, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An air actuator device is provided for manually operable hydraulic valves having a valve spool moving in a bore in a valve housing in the form of an actuator housing adapted for attachment on the valve housing and having a bore carrying a piston coaxially engageable with the spool end, spaced openings in the actuator housing communicating with the bore therein to introduce air to act on opposite sides of the piston and resilient means on at least one side of the piston normally urging the piston and spool to a closed position.
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