In this case, we must find a way to change this situation. The valve experts lived up to expectations and found a solution: the main parts of the one-way metal seal pneumatic ball valve include the left valve body (including the integrated valve seat), the right valve body, the ball, the right valve seat, the elastic pad and the valve stem, and the contact part between the left valve body and the ball, Build up stellite alloy or spray metal particles at supersonic speed to obtain superhard spray coating, and directly make an integrated valve seat sealing surface on it. The sphere also adopts supersonic spray surface hardening technology. The right valve seat does not play a sealing role and does not need surface hardening treatment. The elastic pad can be made of flexible graphite or disc spring. The valve improved by this method has been well applied in production practice.

Pneumatic butterfly valve and v-type regulating ball valve are mainly used in flue gas desulfurization pipeline system of coal-fired power plant. The characteristics of V-type regulating ball valve and electric butterfly valve will be explained below.
According to the principle of pipe baffle, pneumatic butterfly valve uses an inclined disc (door) as the control element, the disc is fixed on the spindle, and the rotating spindle is used to control the opening and closing. The valve seat can be metal, rubber, Teflon and other materials, and fixed on the valve body wall. This valve is simple in structure. Its valve body is of pancake type, small in mass and small in space. It can be used for throttling, opening and closing. It is especially suitable for controlling large flow, not small flow.