Structural featuresSelf-sealing gate valve, including valve body, valve seat, gate, valve stem, valve cover, bracket, hand wheel, the lower end of the valve stem is fixedly connected with the gate plate, and the upper end of the valve stem is connected with the handwheel through the valve stem nut. There is a valve stem self-sealing device between the valve cover and the valve stem in the middle cavity of the valve body. The valve stem self-sealing device is composed of a sealing seat, a cylindrical spring, a graphite packing, and a packing gasket. On the central screw hole of the valve cover, the lower end surface of the sealing seat is provided with a bell mouth facing the inner cavity of the valve body, the upper end surface of the sealing seat is provided with an annular groove, the lower end of the cylindrical spring is sleeved in the annular groove on the upper end surface of the sealing seat, and the upper end of the cylindrical spring It is installed in the lower plane of the packing gasket, and the graphite packing is installed between the upper plane of the packing gasket and the inner plane of the valve cover. The graphite packing is pressed together by the spring preload and the medium pressure to realize the self-sealing between the valve stem and the valve cover, and the sealing performance is good. It is suitable for high temperature and high pressure gate valves in power stations, petrochemicals, long-distance pipelines and other systems.
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