(1) Wedge type single gate valve 1 The structure is simpler than the elastic gate valve;
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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.
(2) Elastic gate valve It is a special form of wedge type single gate. 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.
(3) Double gate type gate valve 1 The sealing performance is better than that of the wedge type 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.
(4) Parallel gate valve 1 The sealing performance is worse than other types of gate valves;
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.