(1) First, the structure of radial seal between the support ring and the valve body in Figure 1 is improved, and the O-ring sealing structure is canceled. The step structure is directly processed on the support ring in Figure 2, so that the seal chamber is formed between the support ring and the valve body. The seal ring with high temperature resistant flexible graphite material is installed in the seal chamber, A gasket with conical section is added behind the sealing ring, and a screw plug with special structure is installed behind the gasket. In this way, the screw plug transmits the force to the gasket by screwing the screw plug. The conical section of the gasket will squeeze the sealing ring, and the sealing ring will deform, making it stick to the support ring and valve body inside and outside in the radial direction, so that the thermal insulation pneumatic ball valve can obtain a high-temperature sealing structure in the radial direction. At the same time, By screwing the screw plug, a pre tight sealing force is generated between the ball and the valve seat to make it sealed.?

Double eccentric wavy butterfly valve The wavy butterfly valve uses a multilateral shaft connection to ensure torque and zero clearance. Because of the valve shaft structure without keyway, the polygonal shaft can transmit more than 20% more torque than the valve shaft with the same diameter; At the same time, there is no need to drill holes on the valve plate of this structure to avoid the contact between the valve rod and the medium. The sealed bearing is safely isolated from the medium under the protection of the O-ring, so as to achieve effective sealing