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    • 89. 发明授权
    • Retrofit device for alfalfa valves
    • 苜蓿瓣改造装置
    • US4699354A
    • 1987-10-13
    • US892006
    • 1986-08-01
    • Clayton H. GibsonDavid A. Young
    • Clayton H. GibsonDavid A. Young
    • F16K31/126F16K31/145
    • F16K31/1262F16K31/145Y10T137/5109
    • A device is described to retrofit an alfalfa valve, without modification of the valve, to convert it from manual to pneumatic control and provide means for closure of the valve if operating pressure to the system is interrupted. The device comprises a first vertical shaft with a short upper threaded portion to secure the shaft to the cover of the alfalfa valve and a lower unthreaded portion; a second vertical shaft above the first shaft and coupled thereto; a chamber including pneumatic means for raising and lowering the shafts, wherein the shafts are in the raised position when the chamber is under pneumatic pressure; a horizontal plate connected to the bottom of the chamber and having a central hole to permit the second shaft to pass therethrough; leg means to stand the plate on top of a flange upon which the cover of the alfalfa valve sits, and means to clamp the plate to the flange.
    • 描述了一种装置,以改造苜蓿瓣,而不改变阀门,将其从手动转换为气动控制,并提供如果系统的操作压力中断时关闭阀门的装置。 该装置包括具有短的上部螺纹部分的第一垂直轴,以将轴固定到苜蓿瓣的盖和较低的无螺纹部分; 在所述第一轴上方的第二垂直轴并与其连接; 包括用于升高和降低轴的气动装置的腔室,其中当腔室处于气动压力下时,轴处于升高位置; 连接到所述室的底部并具有允许所述第二轴通过的中心孔的水平板; 支脚意味着将板固定在苜蓿瓣的盖子所在的法兰的顶部上,以及将板夹在法兰上的装置。