The sealing reliability of the valve directly affects the performance of the valve. In order to achieve better performance of the valve, special requirements are required for the structure and materials of the valve. The valve is used for hazardous media containing highly toxic gas, ammonia, sodium, heavy water or radioactive substances. Double packing sealing structure is adopted. The packing adopts high-quality flexible graphite braided packing, and the gasket adopts high-strength flexible graphite plate to ensure the reliability of sealing. The valve is used in high temperature, strong acid, strong alkali and other strong corrosion conditions. In addition to proper selection of the material of the internal parts of the valve (such as the valve stem is 1Crl8Ni9Ti or 2Cr13), high-strength bolts and nuts should also be used. " The sealing surface of the valve seat shall be made of different surfacing materials according to the actual working conditions of the transmission medium. The double eccentric semi pneumatic ball valve adopts a metal hard sealing structure, which is suitable for conveying gas-liquid two-phase flow media containing solid particles. It has been used in petroleum, chemical, gas, metallurgy, steel, power and other industries, and is welcomed by users.

Troubleshooting of leakage on sealing surface of pneumatic butterfly valve
1. There are sundries on the butterfly plate and sealing surface
2. The closed positions of butterfly plate and sealing surface are not aligned
3. The stress on the bolts of the flange installed at the outlet side is uneven