Air shift conversion apparatus for manual valves

Details Air shift conversion apparatus for manual valves Air shift conversion apparatus for manual valves

1984-08-28

1986-04-29

Michalsky, Gerald A.

Fluid handling

Convertible

Reversible check

91449, 92131, 13762566, 251 31, 251 636, F15B 13042

Patent

active

045850240

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.

REFERENCES:
patent: 3875849 (1975-04-01), Patel
patent: 4011891 (1977-03-01), Knutson et al.
patent: 4290447 (1981-09-01), Knutson
patent: 4338962 (1982-07-01), Turko et al.
patent: 4428400 (1984-01-01), Tantardini
patent: 4478240 (1984-10-01), Tanner

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