Performance comparison of different structure gate valves:
1. Wedge type single GATE gate valve:
A, the structure is simpler than the flexible gate valve;
b, at a higher temperature, the sealing performance is not as good as the elastic gate valve or double gate valve;
C, suitable for easy coking high-temperature medium.
2. Flexible Gate Gate valve:
A, it is a special form of wedge type single gate valve. Compared with the wedge-type gate valve, at high temperature, the sealing performance is good, the gate board is not easy to be jammed after heating;
b, applicable to steam, high-temperature oil and oil and gas medium, and is suitable for frequent switching parts;
c, not suitable for easy coking medium.
3. Double Gate Gate valve:
A, the sealing performance is better than the wedge-type gate valve, when the angle of the sealing surface and the valve seat match are not very accurate, still have good sealing performance;
B, the gate seal surface wear, the spherical top of the bottom of the metal pad can be replaced after the use, generally do not have to heap welding and grinding cover;
C, applicable to steam, high-temperature oil and oil and gas medium, and is suitable for frequent switch parts;
D, not suitable for easy coking medium.
4. Parallel Gate valve:
A, sealing performance is worse than other forms of gate valve;
b, suitable for the medium with low temperature and pressure;
c, gate and valve seat sealing surface processing and maintenance than other forms of gate simple.