Although multiple seals are expensive, difficult to process, and the application and design requirements of medium and high temperature pneumatic ball valves in foreign power plants are limited, they can increase the flow capacity of pneumatic ball valves. The concentric metal ring of this kind of seal is pressed to the ball by pipeline pressure, so as to squeeze the non-metallic seal ring and make the ball form a more tight seal than the metal ring. The high temperature pneumatic ball valve used for throttling abroad is generally l0.5MPa 441 ℃ (825F)+the pressure difference is 3.4MPa. The temperature difference is 243 C (470 F) for valves at 649 ℃ (1200 F) and 32 MPa. The valve body is made of chromium molybdenum alloy, the ball is made of 410 stainless steel, the surface is welded with hard alloy and then plated with chromium, and the seal ring is made of stellite

Features of pneumatic flange butterfly valve D941X pneumatic soft seal butterfly valve:
1. The pneumatic butterfly valve has excellent two-way sealing performance and small torque value.
2. The flow characteristic of pneumatic butterfly valve tends to be straight, with good regulation performance.
3. Flange connection and installation are convenient, both vertical and horizontal.
4. The diversity of sealing materials is available for users to choose.
5. Pneumatic butterfly valve can be used as vent valve at pipe end, with reliable performance.
6. The valve seat sealing ring is organically combined with the valve body, so that the valve has a long service life.