发明名称 |
Control valves for vehicle hydraulic systems |
摘要 |
A control valve assembly incorporates a piston and a flow control valve which are both biassed in the same direction against pressure in an hydraulic accumulator by first and second respective springs. Accumulator pressure in a control chamber also acts to urge the flow control valve in the same direction as it is biassed by the second spring and pressure from a pump acts to bias the flow control valve in the opposite direction. A pilot dump valve controlling communication between the chamber and an outlet connection is normally biassed into a closed position by a third spring. The dump valve is adapted to open at a cut-out pressure to dump pressure from the chamber, and the cut-out pressure is determined by the area of the seating of the dump valve over which the pressure in the chamber acts, and the force in the third spring. A cut-in pressure at which the dump valve closes is determined by the area of the piston and the force in the first spring.
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申请公布号 |
US4543976(A) |
申请公布日期 |
1985.10.01 |
申请号 |
US19850690037 |
申请日期 |
1985.01.09 |
申请人 |
LUCAS INDUSTRIES PUBLIC LIMITED COMPANY |
发明人 |
FARR, GLYN P. R. |
分类号 |
B60T13/14;F15B1/027;(IPC1-7):G05D16/10 |
主分类号 |
B60T13/14 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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