Shutoff valve for cryogenic liquid storage tank
    12.
    发明授权
    Shutoff valve for cryogenic liquid storage tank 失效
    低温液体储罐的截止阀

    公开(公告)号:US4956975A

    公开(公告)日:1990-09-18

    申请号:US395324

    申请日:1989-08-17

    Abstract: There is disclosed an improved internal pressure relief valve for filling a cryogenic liquid storage tank. The internal pressure relief valve consists of a housing with a sealing seat at one end, an inlet hole at the other end, and a ball enclosed therein. The internal pressure relief valve is constructed of materials which can withstand the heat encountered during fabrication without melting. Consequently, the material for the ball is more dense than the cryogenic liquid in the tank so that the ball will not float in the cryogenic liquid. Consequently, the ball and the housing are dimensioned so that the momentum of the cryogenic liquid as it flows into the housing toward a vent port during the filling operation is sufficient to drive the ball into engagement with the sealing seat, closing the vent port, and assuring the termination of the filling process when the pressure in the cryogenic tank builds up to that of the delivery pressure.

    Abstract translation: 公开了用于填充低温液体储存罐的改进的内部压力释放阀。 内部减压阀由一端具有密封座的壳体,另一端的入口孔和封闭在其中的球体组成。 内部减压阀由能够承受制造过程中遇到的热量而不熔化的材料构成。 因此,球的材料比罐中的低温液体更致密,使得球不会漂浮在低温液体中。 因此,球和壳体的尺寸设计成使得当在充填操作期间,低温液体流入壳体中朝向通气口的动量足以驱动球与密封座接合,关闭通气口,以及 确保在低温罐中的压力达到输送压力时的填充过程的终止。

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