Pneumatic ball valve is a combination of pneumatic actuator and ball valve. It can replace manual operation, not only save a lot of manpower and material resources, but also control multiple ball valves at the same time. The pneumatic ball valve is relatively simple in structure, convenient in maintenance and high in relative safety. It is made of superior materials and properly used. Its service life can reach 1 million times. Pneumatic ball valve is evolved from plug valve. It has the same 90 degree rotation action, but the difference is that the cock body is a sphere with a circular through hole or channel through its axis. The proportion of the sphere and the passage opening should be such that when the sphere rotates 90 degrees, the inlet and outlet should be all spherical, so as to cut off the flow.

2. Flow rate, full scale flow, range and caliber The selected instrument caliber is not necessarily the same as the pipe diameter, but depends on the flow. The process industry transports water and other liquids with different viscosity, and the pipeline flow rate is generally 1.5~3m/s. The electromagnetic flowmeter is used on such pipes, and the sensor diameter is the same as the pipe diameter.