The opening and closing component of the concealed rod elastic seat sealing gate valve is the gate plate, and the movement direction of the gate plate is perpendicular to the fluid direction. The gate valve can only be fully opened and fully closed, and cannot be adjusted or throttled. The gate valve has two sealing surfaces, and the two sealing surfaces of the commonly used mode gate valve form a wedge shape. The wedge angle varies with the valve parameters, usually 50, and 2 ° 52 '' 'when the medium temperature is not high. The gate of a wedge gate valve can be made as a whole, called a rigid gate; It can also be made into a gate that can produce slight deformation, and with its processability, it can compensate for the deviation of the sealing surface angle during the processing. This type of gate is called an elastic gate, usually connected by flanges.

Elastic seat seal gate valve [1], also known as lift rod gate valve (also known as rising stem gate valve). Usually, there are trapezoidal threads on the lifting rod, and through the nut of the valve and the guide groove on the valve body, the rotational motion is converted into linear motion, that is, the operating torque is converted into operating thrust. When opening the valve, when the height of the gate is equal to 1:1 times the diameter of the valve, the fluid channel is opened, but this position cannot be monitored during operation. In actual use, the vertex of the valve stem is used as a marker, that is, the position where it cannot be opened, as its fully open position. To consider the phenomenon of locking due to temperature changes, it is usually done by opening the valve to the top position and then reversing it by 1/2-1 turn as the position for fully opening the valve. Therefore, the fully open position of the valve is determined by the position of the gate (i.e. stroke).