The gate valve is a shutter of the opening and closing member. The direction of movement of the gate is perpendicular to the direction of the fluid. The gate valve can only be fully open and fully closed, and cannot be adjusted and throttled. The gate valve is sealed by the contact between the valve seat and the gate. Usually, the sealing surface will be welded with metal material to increase wear resistance, such as surfacing 1Cr13, STL6, stainless steel, and the like. The gate has a rigid gate and an elastic gate. According to the gate, the gate valve is divided into a rigid gate valve and a flexible gate valve.
Double gate gate valve:
（1）The sealing performance is better than that of the wedge gate valve. If the angle of the sealing surface and the valve seat are not very accurate, the sealing performance is still good;
（2）After the sealing surface of the ram is worn, the metal pad at the bottom of the spherical top can be replaced by a thicker one. Generally, it is not necessary to weld and grind the sealing surface. This is difficult to achieve with a single ram and an elastic ram.
（3）parts are more than other types of gate valves;
（4）In addition to suitable for steam, oil and other media, it is also suitable for frequent switching parts and media with large wear on the sealing surface. It is not suitable for medium that is easy to coke.
Wedge single gate valve:
（1）structure is simpler than the elastic gate valve;
（2）At higher temperatures, the sealing performance is not as good as that of the elastic gate valve or the double gate valve;
（3）Suitable for high temperature medium that is easy to coke.
Parallel gate valve:
（1）sealing is worse than other forms of gate valve;
（2）Suitable for medium with low temperature and pressure;
（3）Except that the rams with fixed plates on the two rams are not easy to fall off, the rams that fix the two rams with lead wire are easy to fall off and are not reliable.
The processing and maintenance of the sealing surfaces of the 4 gates and valve seats are simpler than other types of gate valves.
Elastic gate gate valve:
It is a special form of wedge type single shutter. Compared with the wedge gate valve, the sealing performance is good at high temperature, and the shutter is not easily caught after being heated; it is suitable for mediums such as steam, high temperature oil and oil and gas, and is suitable for frequent switching parts. Not suitable for media that are easy to coke.
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