1. The structure is reasonable, the dimensional accuracy is high, and the requirements for roundness, coaxiality, surface finish and shape and position tolerance are very high. The ball hardly floats or the floating amount is very small, which greatly reduces the friction between the lower ball seat and the ball and the rotating torque of the ball.

2. The sphere and valve seat treated by supersonic flame spraying cemented carbide have high hardness, erosion resistance, acid and alkali resistance.

3. Special surface treatment. High hardness and smooth surface. Low friction, effectively reducing the switching torque. 168 plug valve can realize 50MPa pressure opening at most, and the torque shall not exceed 800N m. One person can switch.

4. A conversion plate is added between the knob and the sphere, which can well eliminate the accumulated tolerance of accessories in assembly. The switching torque is greatly reduced.

5. A PTFE washer containing carbon fiber is added between the knob and the body. The friction is reduced through the small friction coefficient of PTFE containing carbon fiber. Reduce the opening torque.

6. The materials are excellent. The shell is made of 4145H or 42crnimo forged materials. The ball, ball seat and knob are made of super stainless steel, with corrosion resistance, high strength and no deformation; The rubber parts used are made of fluororubber or hydrogenated nitrile rubber. It has the advantages of high and low temperature resistance, corrosion resistance and high pressure resistance.