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1. Three eccentric seal structure, seat and disc almost no wear, with the Seal ring made of stainless steel, with dual benefits of metal seal and flexibility. No matter in the case of low temperature or high. Both with excellent sealing properties, resistant to corrosion, and long service life.

2. The seal ring is made of stainless steel, and having the dual advantages of metal seal and elastic seal.No matter in low temperatures or high, both with excellent sealing properties, resistant to corrosion, long service life.

3. Large size disc using lattice structure, high strength, flow area large, small flow resistance.

4.Disc sealing surface using cobalt-based alloy welding, sealing surface wear resistance and long service life

5. The valve has a two way sealing function, the installation media from the flow restriction are not subject to the impact of spatial location. Can be installed in any direction,

6. Drive can be multi-position(rotated 90°or 180°)to install. Easy to use.

D643H-10/16/25/The main external connection dimensions of pneumatic hard seal butterfly valve.(unit:mm)

 After the installation, regular maintenance is necessary. The maintenance scopes are mainly as follows：

(1)  the abrasion condition of sealing surface；

(2)  the abrasion condition of valve stem and its trapezoidal nut；

(3)  the abrasion condition of "O" rubber sealing ring；

(4)  Whether packing is effective;

(5) Whether there is dirt accumulation in cavity;

(6) Whether the trip switch and over torque protection device of the electric valve are in good condition;