The seal formed by the semi pneumatic ball valve is spherical seal, so Q=Q | F+QQ=qMF (DMW _DMN) (?) QMJ=(DMN+b) P ^, r is the actual specific pressure on the g sealing surface in the formula of "DMW+DMN" nb, the necessary specific pressure on the MPag sealing surface, the allowable specific pressure on the MPa [q] sealing surface, the total force on the MPaQ sealing surface, the side surface area on the NM sealing belt, Mm2Q is the static pressure of the medium acting on the sealing surface, the force acting on the NQ MJ sealing surface when reaching the required specific pressure. N6 is the width of the sealing belt, the half angle of the contact between the mma sealing surface and the spherical surface, and the friction coefficient of the sealing surface of (.) Plant M is the medium pressure, MPa; Inner diameter of sealing surface, mmD, outer diameter of sealing surface, mm? The dynamic and static sealing structure of the valve stem and the fixed mandrel is to ensure that there is no dynamic and static leakage point in the structure of the valve, and to ensure the safety of the service environment of the valve, which is particularly important for the transportation of high temperature, high pressure and harmful media.

So I want to talk to you about some precautions in the installation and maintenance of pneumatic butterfly valves. Many operators or installers need to understand and master them, so that they can better install this kind of equipment. I believe you can understand and understand this problem well. Of course, there are other aspects of knowledge about pneumatic butterfly valves. Relevant information What is the highlight of electric on-off butterfly valve? Consumers would prefer to pick up the pneumatic on-off ball valve. How to install and debug the valve body of the pneumatic on-off butterfly valve and the electric three-way ball valve of the cylinder. How to deal with the failure of the pneumatic high-pressure ball valve also needs "maintenance"