1. Stem lifting wedge plug valve, with no friction on the switch, ensures easy operation, zero leakage and long service life.

When opening the valve, the valve core moves upward to break away from the valve seat, and then rotates 90 ° without friction until the valve is opened; when closing the valve, the valve core rotates 90 ° without friction, and then extrudes to the valve seat until it is completely closed. During the opening and closing process of the valve, there will always be no friction between the valve core and the valve seat.

2. Double shut-off and automatic valve sealing device (DBB function, with abv automatic relief system).

3. There are end caps at the top and bottom, which can be maintained and repaired online quickly;

When there is medium in the pipeline, the bottom end cover can be removed by closing the valve, which can quickly remove hard particles such as sand and welding slag, and is convenient for valve maintenance and seal replacement.

Disadvantages of gate valve:

1. Friction always exists in the process of opening and closing the ram, so the operation torque is large, and it is easy to produce scratches on the sealing surface of the ram and valve seat, resulting in valve leakage;

2. There is no self checking leakage device (even if a small valve is installed through two gate valves to achieve this function, the automatic detection function can not be realized);

3. For the medium containing particles, such as sand, deposited at the bottom of the valve, so that the gate can not be fully closed in place, resulting in the leakage of the valve is very serious (this is a fatal disadvantage for the gate valve).