Valves and valve actuation – Mechanical movement actuator – Plural motions of valve
Patent
1997-02-21
1998-07-07
Walton, George L.
Valves and valve actuation
Mechanical movement actuator
Plural motions of valve
251215, 251337, 464 39, F16K 3150, F16K 5100
Patent
active
057756724
ABSTRACT:
A release valve for a lifting device includes a valve stem, a fixing seat, a spiral spring, and a knob. The valve stem includes a first conical end mounted in an oil path of the lifting device, a mediate portion, and a second end beyond the lifting device. The valve stem further includes a threaded section in threading engagement with the lifting device. The fixing seat is mounted around the mediate portion of the valve stem and is beyond the lifting device. The fixing seat includes a boss formed on a first side thereof, a central through hole extending through the fixing seat and the boss. The boss includes a longitudinal slit defined in a periphery thereof. The spiral spring is mounted around the boss of the fixing seat. The spiral spring has an inner end which is securely received in the longitudinal slit of the boss and an outer end. The knob is securely mounted around the second end of the valve stem to rotate therewith. The knob includes a protrusion projecting from a side thereof, and the outer end of the spiral spring is securely engaged with the protrusion.
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patent: 4867415 (1989-09-01), Andrea
patent: 5065787 (1991-11-01), Lochmann
Klein David I.
Lee Jun Y.
Rosenberg Morton J.
Walton George L.
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