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    • 1. 发明授权
    • Hydraulic switching valve, and a free piston engine provided therewith
    • 液压切换阀以及与其配合的自由活塞式发动机
    • US5983638A
    • 1999-11-16
    • US776035
    • 1997-04-28
    • Peter Augustinus Johannes AchtenTheodorus Gerhardus PotmaMaria Pauline Engel
    • Peter Augustinus Johannes AchtenTheodorus Gerhardus PotmaMaria Pauline Engel
    • F02B71/00F01B11/00F01L25/06F02B71/02F02B71/04
    • F02B71/02F01L25/06F02B71/045
    • An hydraulic switching valve (35) comprises, among other parts, a valve housing (45, 62) with a first connection (33, 36) and a second connection (34, 67) and a valve body (37, 63) which is movable in the valve housing (45). The switching valve (35) is open when the pressure at the first connection (33) is higher than the pressure at the second connection (34) as a result of the fact that the pressure difference caused by the movement of the valve body (37) allows a flow past the valve body (37). The switching valve is closed when the pressure at the first connection (33) is lower than the pressure at the second connection (34) as a result of the fact that the movement of the valve body (37) caused by the pressure difference closes a valve seal (40) which blocks the flow. The switching valve (35) further comprises a lock (39) with switching element (42) for selectively keeping the valve seal (40) closed, and unblocking the valve body (37), respectively.
    • PCT No.PCT / NL95 / 00260 Sec。 371日期1997年04月28日 102(e)日期1997年4月28日PCT提交1995年7月26日PCT公布。 公开号WO96 / 03575 日期1996年2月8日,液压切换阀35包括具有第一连接件33,36和第二连接件34和阀体37的阀壳体45,62。 ,63),其可在阀壳体(45)中移动。 当第一连接部33处的压力高于第二连接部34处的压力时,切换阀35打开,由于阀体37的运动引起的压力差 )允许流过阀体(37)的流动。 当第一连接部33处的压力低于第二连接部34处的压力时,由于压力差引起的阀体37的移动闭合,切换阀闭合 阻塞流体的阀密封件(40)。 切换阀(35)还包括具有开关元件(42)的锁(39),用于选择性地保持阀密封(40)关闭,并且分别解除阀体(37)的阻塞。