How to determine the design parameters of pneumatic ball valve?

some of the specifications of the corresponding parameters in the design of pneumatic ball valve is required to determine down, specific as follows: clear and specific parameters of pneumatic ball valve, conditions of use and related standards of execution, etc. , pneumatic ball valve structure to determine: if the pressure is not high, DN, or less can choose simple structure of the floating structure, if floating structure can't meet the production requirements can choose fixed or other structure. , pneumatic ball valve seal material to determine: if the temperature is less than or equal to the degree that can choose plastic materials as sealing surface. If use temperature is greater than, or the medium containing particles, can choose metal materials as sealing surface. , pneumatic ball valve use requirement: fire prevention, anti-static requirements, etc. , pneumatic ball valve channel number: direct, tee, four-way, etc. , the determination of elastic element form. Length, pneumatic ball valve structure and determination of connection size. , the determination of spheres channel diameter, determine the diameter of the sphere.