Liquid hydrogen stop valve

Abstract

The liquid hydrogen stop valve comprises a valve body, a valve cover is connected to the upper surface of the valve body in a sealed mode, a connecting flange is connected to the upper surface of the valve cover in a sealed mode, a valve rod is connected to the inner wall of the connecting flange in a threaded mode, and the lower end of the valve rod is movably installed in the valve cover and penetrates through the valve cover to be arranged in the valve body. The lower end of the valve rod is fixedly connected with a main valve element, the upper end of the valve rod is fixedly connected with a first hand wheel, a through hole is formed in the inner wall of the valve body, and a second plugging device is arranged on the lower surface of the main valve element, so that the situation that when the main valve element is in a sealed state, the bottom of the main valve element is squeezed by a medium entering a cavity is avoided as much as possible; and when the main valve core is in a medium extrusion state for a long time, the sealing surface of the main valve core is scoured by the medium, so that the sealing surface is damaged, and the sealing performance in the stop valve is reduced.

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