The shut-off valve, also known as the gate valve, is a forced-sealed valve, so when the valve is closed, pressure must be applied to the valve flap to force the sealing surface to not leak. When the medium enters the valve from below the valve flap, the resistance to be overcome by the operating force is the friction between the stem and the packing and the thrust generated by the pressure of the medium. The force of closing the valve is greater than the force of opening the valve, so the valve stem The diameter of the stem should be large, otherwise the valve stem can be bent.
As one of the most important shut-off valves, the shut-off valve plays an important role in the aerospace industry. As an important component of aerospace equipment, the shut-off valve realizes the functions of medium conveying, cut-off, adjustment, etc. Its sealing performance directly affects the safe and reliable operation of aerospace equipment. Studying the influencing factors and influence rules of the typical shut-off valve sealing characteristics, it has guiding significance for the structural design of the valve sealing pair, thus improving the sealing performance and reliability of the valve.
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