After consulting a large number of documents and materials, our R&D personnel repeatedly tested, and put forward a new design method of sealing valve seat, let me introduce in detail: in view of the above problems, we have improved the contact structure of the sealing ring. Take the middle positive pressure point as the center, extend 1mm to both sides to retain the original shape, and remove 0.2mm for the rest, taking the compression amount as 0.5~0.6mm, that is, the sealing ring is compressed 0.25~0.3mm in one direction. After the valve cover is fastened, the sealing ring. The contact force is only applied on the circumference with a width of 2mm, and the contact surface with the ball force is reduced by 2/3, which can be approximately regarded as a line contact. Under the same tightening force, compared with the original seal ring, the sealing performance is improved, and the pulling torque of the handle is reduced. Even if the ball is offset △ during tightening, the boss will not be generated, so that the opening and closing torque is uniform. If concave, the sealing surface is protected. Due to the reduction of the contact area and the change of the stress state of the contact area of the seal ring, the influence of the change of the size accuracy of the parts and the change of the tightening force on the opening and closing torque and the sealing performance after tightening is reduced, thus improving the bench rate of the finished valve.

Structural analysis of stainless steel pneumatic butterfly valve
One or more layers of steel wire or steel belt net sleeves are made of stainless steel corrugated pipes, and both ends are equipped with joints or flange heads, which are used to escort flexible components of various media.
2、 Features: corrosion resistance, high temperature resistance, low temperature resistance (- 196 ℃~+420 ℃), light weight, small size, good flexibility.
It is widely used in aviation, aerospace, petroleum, chemical industry, metallurgy, power, paper making, wood, textile, construction, medicine, food, tobacco, transportation and other industries. 　
1. Recommend corrosive chemical media or organic solvents. (For example: loading and unloading ammonia, acetone, etc.)
2. Escort high-temperature gas, hot oil and other high-temperature media. (For example: hot steam, heat transfer oil, etc.) 3. Escort low temperature or ultra-low temperature media. (e.g. liquid nitrogen)
4. Water, steam, oil and other media shall be guaranteed under high temperature environment. (For example: water vapor system and hydraulic system in coking, steelmaking and continuous casting equipment) 5. Pipeline requiring shock absorption or noise elimination. (For example: pump inlet and outlet) Specification: ￠ 4 - ￠ 600 Pressure: 0.6MPa-25.0MPa Executive specification: GB/T14525-93