Power plants – Pressure fluid source and motor – Manual pump pressurizes fluid to position output motor...
Patent
1995-03-02
1996-01-09
Hepperle, Stephen M.
Power plants
Pressure fluid source and motor
Manual pump pressurizes fluid to position output motor...
91420, 137106, F16D 3102
Patent
active
054818710
ABSTRACT:
A lock valve apparatus and a hydraulic system incorporating a lock valve apparatus including a lock valve body with a bore, a first port, a second port, a third port and a fourth port. There is a spool valve with a valve spool reciprocatingly received in the bore. The spool valve, a first one-way valve and a second one-way valve normally prevent fluid flowing between the ports. The first one-way valve and passageways in the valve permit a fluid flow from the first port to the third port when the first port is pressurized. The second one-way valve and passageways in the spool valve body permit a fluid flow from the second port to the fourth port when the second port is pressurized. The spool valve is shifted to align passageways, including a first annular passageway, between the spool and the bore to permit a return flow of fluid from the fourth port to the second port when the first port is pressurized. The first annular passageway receives pressurized fluid from the fourth port. The spool is shifted to align passageways, including a second annular passageway, between the spool and the bore to permit a return flow of fluid from the third port to the first port when the second port is pressurized. The second annular passageways receives pressurized fluid from the third port.
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Cameron Norman M.
Hepperle Stephen M.
Teleflex (Canada) Ltd.
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