发明名称 |
Valve assembly for attenuating bounce of hydraulically driven members of a machine |
摘要 |
A member that is driven by a hydraulic actuator tends oscillate when fluid flow to the hydraulic actuator is terminated. A pressure relief device reduces that oscillation by connecting first and second first relief valves to the hydraulic actuator. The first relief valve provides a relatively large first relief passage as long as pressure in the hydraulic actuator remains above a threshold. A second relief valve opens a second relief passage at substantially the same threshold pressure and thereafter remains open as long as the pressure remains above another lower threshold. A timer causes the second relief valve to close a given interval of time, if the pressure does not drop below the other lower threshold.
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申请公布号 |
US6959726(B2) |
申请公布日期 |
2005.11.01 |
申请号 |
US20030676776 |
申请日期 |
2003.10.01 |
申请人 |
HUSCO INTERNATIONAL, INC. |
发明人 |
JERVIS MARK J.;VALENTA ROBERT J.;RUSSELL LYNN A.;HAGGERTY SEAN M. |
分类号 |
E02F9/22;F15B11/044;F15B21/04;(IPC1-7):F16K15/02 |
主分类号 |
E02F9/22 |
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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