3 The advantage of pneumatic ball valve is the lowest flow resistance (actually zero). It can be reliably used in corrosive media and low boiling liquid because it will not be stuck during operation (without lubricant). In a large range of pressure and temperature, it can achieve complete sealing. It can realize fast opening and closing, and the opening and closing time of some structures is only 0.05~0.1s to ensure that it can be used in the automation system of the test bench. When the valve is opened and closed quickly, the operation is free of impact. The spherical closure can be automatically positioned in position. The working medium is reliably sealed on both sides. When fully open and fully closed, the sealing surfaces of the ball and valve seat are isolated from the medium, so the medium passing through the valve at high speed will not cause erosion of the sealing surface. Compact structure and light weight make it the most reasonable valve structure for cryogenic medium system. The valve body is symmetrical, especially the welded valve body structure, which can well withstand the stress from the pipeline. The closing element can withstand the high differential pressure when closing. The pneumatic ball valve with fully welded valve body can be directly buried underground, so that the valve internals are not corroded, and the maximum service life can reach 30 years. It is the most ideal valve for oil and natural gas pipelines. As the pneumatic ball valve has the above advantages, it has a wide range of applications. The pneumatic ball valve can be used from 8mm to 1200mm in nominal diameter. Nominal pressure ranges from vacuum to 42MPa. The operating temperature ranges from - 204 ℃ to 815 ℃.

The Method for Compiling Valve Models is applicable to gate valves, throttle valves, ball valves, butterfly valves, diaphragm valves, plunger valves, plug valves, check valves, safety valves, pressure reducing valves and steam traps for industrial pipelines. It includes valve model preparation and valve naming.