发明名称 |
Hydraulic systems |
摘要 |
An hydraulic lift system has an actuator connected to an hydraulic circuit, having a pump, via a supply line. A balanced seated valve is connected between the supply line and a reservoir, the valve being controlled by a solenoid and an electric drive unit. The drive unit supplies a gradually increasing or decreasing voltage to the solenoid to open or close the valve gradually. The valve has a valve member that is displaceable along its length and has a valve head of frusto-conical shape. A passage along the valve member balances fluid pressure across the valve member. The solenoid has an armature with a pole face that can be displaced towards a fixed pole face to unseat the valve member. The pole faces have complementary frusto-conical surfaces and there is a non-magnetic washer between them.
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申请公布号 |
US5584224(A) |
申请公布日期 |
1996.12.17 |
申请号 |
US19950541091 |
申请日期 |
1995.10.11 |
申请人 |
SMITHS INDUSTRIES PUBLIC LIMITED COMPANY |
发明人 |
DAVIES, ANTHONY R.;DOWNWARD, STEPHEN J.;WALLACE, MICHAEL J. |
分类号 |
B66F17/00;B66B1/04;B66F9/22;F15B11/04;F15B11/048;(IPC1-7):F15B13/16 |
主分类号 |
B66F17/00 |
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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