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    • 1. 发明申请
    • NORMALLY CLOSED FLUID SWITCHING LOGIC ELEMENT
    • 正常关闭液体开关逻辑元件
    • WO1986004400A1
    • 1986-07-31
    • PCT/US1986000155
    • 1986-01-29
    • SUN HYDRAULICS CORPORATIONCLARK, Richard, J.
    • SUN HYDRAULICS CORPORATION
    • F16K31/163
    • F16K31/1221F16K31/406
    • A normally closed fluid switching logic elements has a plurality of radial ports (36) to a first chamber (34). A poppet (22), connected to a piston (14) within the element, moves between an open position off its poppet seat (24) and a closed position. In the open position another port is provided to the first chamber permitting fluid flow. The poppet (22) is biased to the closed position by a spring (26), but also by fluid pressure at either or both ports. The poppet (22) may be displaced only by a pressure in a second chamber (30) behind the piston (14). In one configuration this opening pressure is provided from an external source. In other configurations, the opening pressure is derived from the first chamber, from the pressure outside the poppet (22) and from either of these.
    • 常闭流体开关逻辑元件具有到第一室(34)的多个径向端口(36)。 连接到元件内的活塞(14)的提升头(22)在离开其提升阀座(24)的打开位置和关闭位置之间移动。 在打开位置,另一端口被提供到允许流体流动的第一室。 提升阀(22)通过弹簧(26)偏压到关闭位置,而且还通过两个或两个端口处的流体压力。 仅通过活塞(14)后面的第二室(30)中的压力可以移动提升阀(22)。 在一种配置中,该打开压力由外部源提供。 在其他构造中,打开压力是从第一腔室,从提升阀(22)外面的压力和这些中的任一个导出的。