Gate valve (gate valve) is the opening and closing parts of the gate, the movement direction of the gate is perpendicular to the direction of the fluid, the gate valve can only be fully open and fully closed, can not be used for regulating and throttling. Gate has two sealing surfaces, the most commonly used mode gate valve two sealing surfaces to form a wedge, wedge angle with the valve parameters vary, usually 50, the media temperature is not high for 2 ° 52'. Wedge gate valve gate can be made into a whole body, called rigid gate; can also be made to produce a small amount of deformation of the gate, in order to improve its manufacturability, to make up for the angle of the sealing surface in the processing of deviation, this gate is called elastic gate. Stainless steel gate valve material is divided into 304 stainless steel gate valve, 316 stainless steel gate valve, 321 stainless steel gate valve. Expression: Z41H-16P.

Types of stainless steel gate valve, according to the sealing surface configuration can be divided into wedge gate gate valve and parallel gate gate valve, wedge gate gate valve can be divided into: single gate pole type, double gate type and resilient gate type; parallel gate gate valve can be divided into single gate type and double gate type. According to the thread position of the valve stem, it can be divided into two kinds of open stem gate valve and dark stem gate valve. This type of valve should generally be installed horizontally in the pipeline.

When opening the valve, when the gate lifting height is equal to 1:1 times the diameter of the valve, the passage of the fluid is completely free, but in operation, this position can not be monitored. In actual use, it is the apex of the valve stem as a mark, i.e., the position of opening motionless, as its fully open position. In order to take into account the temperature changes in the phenomenon of locking, usually open to the apex of the position, and then back 1/2-1 turn, as the fully open position of the valve. Therefore, the valve's fully open position, according to the position of the gate (i.e., trip〉to determine.

Some gate valves, stem nut on the gate, handwheel rotation drive stem rotation, and make the gate lift, this valve is called a rotating stem gate valve or dark stem gate valve.