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    • 8. 发明专利
    • Relief valve
    • 救护阀
    • JP2005226822A
    • 2005-08-25
    • JP2004155809
    • 2004-05-26
    • Volvo Construction Equipment Holding Sweden Abボルボ コンストラクション イクイップメント ホールディング スウェーデン アーベー
    • CHEONG HAE KYUN
    • F16K17/04F15B11/028F15B21/04F16K17/02F16K17/10
    • F16K17/105Y10T137/7766
    • PROBLEM TO BE SOLVED: To provide a relief valve which includes a annular passage functioning as a filter in a flow inlet of a piston flow passage inserted to the front part of a main poppet and which prevents entry of foreign matter inside a valve by filtering forein matter contained in pressure oil. SOLUTION: The relief valve comprises a high pressure inlet to which pressure oil in a pump is supplied, a sleeve in which a tank flow passage for feeding pressure oil in the high pressure inlet back to a tank is formed, a main poppet provided to the inside of the sleeve so as to open and close the high pressure inlet and the tank flow passage, a piston in which a piston passage for communicating between the high pressure inlet and a back pressure chamber is formed and which is slidably inserted in a poppet passage formed at the front end of the main poppet, an annular passage communicating to the piston passage, a seat part which supports the rear end of a main poppet spring and includes a sheet flow passage communicating to the back pressure chamber, and a pilot poppet which is elastically supported by the pilot poppet spring and provided with the seat flow passage so as to be freely opened/closed and which communicates between the seat flow passage and the tank flow passage. COPYRIGHT: (C)2005,JPO&NCIPI
    • 解决的问题:提供一种安全阀,该安全阀包括在插入到主提升阀的前部的活塞流动通道的入口中用作过滤器的环形通道,并且防止异物进入阀内 通过过滤压力油中含有的物质。 解决方案:安全阀包括供应泵中的压力油的高压入口,其中形成有用于将高压入口中的压力油返回到罐的罐流动通道的套筒,主阀座 提供到套筒的内部以便打开和关闭高压入口和罐流动通道;活塞,其中形成有用于在高压入口和背压室之间连通的活塞通道,并且其可滑动地插入 形成在主提升阀的前端的提升通道,与活塞通道连通的环形通道,支撑主提升阀弹簧的后端的座部,并且包括与后压室连通的片流动通道, 导向提升阀,其由先导式提升阀弹簧弹性地支撑并且设置有座椅流动通道,以便自由打开/关闭,并且在座椅流动通道和油箱流动通道之间连通。 版权所有(C)2005,JPO&NCIPI