1. The structure adopts eccentric tightening principle to achieve the purpose of tightening, adjusting and closing the gate through the transmission mechanism. The sealing pair is a metal face ring with hard face contact seal. The double eccentric structure has a large flow section and the valve core is not washed when it is opened. The valve core is not washed when it is closed and the ball surface of the valve core is along the valve when it is opened. It can effectively remove the scaling barriers and achieve reliable sealing.

2. Valve hemispheric bimetal, base metal surfacing of different alloys, valve seats also make the corresponding surfacing after special treatment, sealing surface combination into anticorrosion, wear resistance, high strength and other types, to meet the needs of different occasions.

3. Tight seal, transportation of harmful gas up to zero leakage.

4. The spool of the sealing pair has compensation. When the valve seat is worn out, it can still be reliably sealed and the service life is prolonged by turning a little when the valve seat is closed. In addition, the user will screw down the pressure nut, adjust or replace the seat is still available, to avoid the valve seal failure, the whole set scrapped.