公开(公告)号：US4210170A

公开(公告)日：1980-07-01

申请号：US879026

申请日：1978-02-17

申请人： ; Gary W. Sutton

发明人： ; Gary W. Sutton

IPC分类号： E02F9/22 ,  F15B13/02 ,  F16K17/02 ,  F16K17/18 ,  F16K17/196

CPC分类号： F15B13/02 ,  E02F9/226 ,  F16K17/02 ,  F16K17/18 ,  Y10T137/7775 ,  Y10T137/7776 ,  Y10T137/7777

摘要： A hydraulic system including at least one hydraulic cylinder is provided with an anti-cavitation and overload relief valve having a housing, a first chamber within the housing in fluid communication with one end of the cylinder, and a second chamber within the housing in fluid communication with a fluid reservoir. A fluid passageway within the valve housing connects the first and second chambers. A movable valve assembly is positioned within the fluid passageway for operating in a first mode to block fluid flow between the first and second chambers, for operating in a second mode to permit fluid flow from the first chamber to the second chamber only when the pressure in the first chamber exceeds the pressure in the second chamber by a first predetermined amount, and for operating in a third mode to permit fluid flow from the second chamber to the first chamber only when the pressure in the second chamber exceeds the pressure in the first chamber by a second predetermined amount. The valve includes a stationary portion positioned within the fluid passageway between the first and second chambers having a valve seat. The movable valve assembly includes a movable valve element having a sealing portion for engaging the valve seat of the stationary portion when the movable valve assembly is operating in the first and second modes. The movable valve assembly further has a valve seat and a poppet mechanism is provided for sealingly engaging the valve seat of the movable valve element when the movable valve assembly is operating in the first and third modes.

摘要翻译： 包括至少一个液压缸的液压系统设置有具有壳体的防空穴和过载安全阀，所述壳体内的第一腔室与所述气缸的一端流体连通，并且所述壳体内的第二腔室以流体连通 与流体储存器。 阀壳体内的流体通道连接第一和第二腔室。 可移动阀组件定位在流体通道内，用于以第一模式操作以阻止第一和第二腔室之间的流体流动，以在第二模式中操作，以允许流体仅在第一腔室中的压力 第一室超过第二室中的压力第一预定量，并且为了在第三模式中操作以允许流体仅在第二室中的压力超过第一室中的压力时从第二室流到第一室 第二预定量。 阀包括位于第一和第二腔室之间的流体通道内的固定部分，其具有阀座。 可移动阀组件包括可移动阀元件，当可动阀组件以第一和第二模式运行时，可动阀元件具有用于接合固定部分的阀座的密封部分。 可移动阀组件还具有阀座，并且提供提升阀机构，用于当可动阀组件在第一和第三模式下操作时，密封地接合可动阀元件的阀座。

公开(公告)号：US4300591A

公开(公告)日：1981-11-17

申请号：US117408

申请日：1980-01-31

申请人： Gary W. Sutton

发明人： Gary W. Sutton

IPC分类号： E02F9/22 ,  F15B13/02 ,  F16K17/02 ,  F16K17/18 ,  F16K17/196

CPC分类号： F15B13/02 ,  E02F9/226 ,  F16K17/02 ,  F16K17/18 ,  Y10T137/7775 ,  Y10T137/7776 ,  Y10T137/7777

摘要： A hydraulic system including at least one hydraulic cylinder is provided with an anti-cavitation and overload relief valve having a housing, a first chamber within the housing in fluid communication with one end of the cylinder, and a second chamber within the housing in fluid communication with a fluid reservoir. A fluid passageway within the valve housing connects the first and second chambers. A movable valve assembly is positioned within the fluid passageway for operating in a plurality of modes for providing anti-cavitation and overload relief. The valve includes a stationary portion positioned within the fluid passageway between the first and second chambers having a valve seat. The movable valve assembly includes a poppet mechanism for sealingly engaging a valve seat of the movable valve element when the movable valve assembly is operating in first and third modes. A tang on the head of the poppet engages a reduced diameter portion of the stationary valve element in order to maintain fluid communication between the first and second chambers during the second mode of operation. An axial extension of a poppet spring seat limits the travel of the movable valve during the third mode of operation and limits the stress on a poppet spring.

摘要翻译： 包括至少一个液压缸的液压系统设置有具有壳体的防空穴和过载安全阀，所述壳体内的第一腔室与所述气缸的一端流体连通，并且所述壳体内的第二腔室以流体连通 与流体储存器。 阀壳体内的流体通道连接第一和第二腔室。 可移动阀组件位于流体通道内，用于以多种模式操作，以提供抗气蚀和过载释放。 阀包括位于第一和第二腔室之间的流体通道内的固定部分，其具有阀座。 可移动阀组件包括提升阀机构，用于当可移动阀组件以第一和第三模式运行时密封地接合可动阀元件的阀座。 在提升阀的头部上的柄脚与固定阀元件的直径减小的部分接合，以便在第二操作模式期间保持第一和第二腔室之间的流体连通。 提升阀座的轴向延伸限制了第三操作模式下可移动阀的行程，并限制了提升阀弹簧上的应力。