Hydraulic valve to maintain control in fluid-loss condition

Details Hydraulic valve to maintain control in fluid-loss condition Hydraulic valve to maintain control in fluid-loss condition

1995-07-13

1996-12-03

Nguyen, Hoang

Motors: expansible chamber type

With motive fluid valve

Contracting chamber exhaust valve controlled by expanding...

91421, 91436, 91446, 137106, F15B 1108, F15B 1304

Patent

active

055796761

ABSTRACT:
A hydraulic fluid-loss control valve for preventing uncontrolled load movement in the event of a fluid loss such as from the bursting of a hose and further for allowing an operator to move the load in a controlled way despite the fluid loss. The control valve is situated between a conventional main spool valve and a piston/cylinder hydraulic actuator which powers the load. The control valve has a spool sliding reciprocally in a bore. Grooves and lands on the spool combine with passages in the control valve body to provide alternate fluid paths between a pump and the actuator and between the actuator and a reservoir. Fluid can flow from a controlled chamber of the actuator only when the spool is in a position which provides a fluid path. A passage within the spool provides fluid communication between an input fluid flow and a chamber at one end of the spool. A second passage within the spool provides fluid communication between an actuator chamber and a chamber at the other end of the spool. The position of the spool is determined by the balancing of the opposing end-chamber pressures, which is under the control of the operator.

REFERENCES:
patent: 3685540 (1972-08-01), Wilke
patent: 4446890 (1984-05-01), Simpson, Jr.
patent: 5036750 (1991-08-01), Katayama
patent: 5076143 (1991-12-01), Ogawa
patent: 5113894 (1992-05-01), Yoshida
patent: 5347811 (1994-09-01), Hasegawa et al.
patent: 5400816 (1995-03-01), Gerstenberger

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