1. The valve middle chamber adopts the pressure self tightening type sealing structure, and the sealing performance is good. The two ends of the branch pipe are welded structures.

2. The sealing surface of disc and seat is made of cobalt-based cemented carbide overlaying welding, which is wear-resistant, high temperature-resistant, good abrasion resistance and long service life.

3. The valve stem is quenched and tempered and nitriding on surface. It has good corrosion resistance and scratch resistance.

4. Design of high temperature creep resistance.

5. The depth of the gland cover is reasonable, the filler is corrosion inhibitor, and the sealing is reliable.

6. The valve has an upper sealing structure to ensure that the valve stem will not leak when the valve is opened and running.