What to do if the pneumatic wafer type hard seal butterfly valve is not flexible? The clearance between the valve seat and the valve body groove is the basic condition to ensure the normal operation of the pneumatic ball valve. When selecting the clearance, it is necessary to consider that the uniform mid length of the precompressed valve seat should be within the total elastic deformation range. For this reason, the formula:; Average valve seat diameter;; Allowable stress of cross section of valve seat within elastic deformation range, for PTFE valve seat,; Elastic modulus of valve seat material, for PTFE valve seat,.
In terms of material, it can be divided into: carbon steel ball valve, stainless steel 304 ball valve, 316 ball valve and copper ball valve
