Stainless steel Ball valve principle

April 13, 2022

Wenzhou Dico Valve Technology Co.,ltd

The main features of the ball valve are its compact structure, reliable sealing, simple structure, sealing surface and spherical surface are often closed, not easily eroded by medium, easy to operate and maintain, suitable for general working medium such as water, solvent, acid and natural gas, and It is also suitable for mediums with harsh working conditions, such as oxygen, hydrogen peroxide, methane and ethylene, which are widely used in various industries. The ball valve body may be integral or combined.

The working principle of the ball valve : the ball valve only needs to rotate 90 degrees and a small rotating torque to reach or cut the medium of the pipe. However, recent developments have designed ball valves to provide throttling and control flow.

ball valve_01

Ball valve advantages : 1 . The fluid resistance is small, and the full-bore ball valve has substantially no flow resistance. 2 . The structure is simple, small in size and light in weight. 3 . Tight and reliable. It has two sealing faces, and the sealing surface material of the ball valve is widely used in various fluoroplastics, and has good sealing performance and can achieve complete sealing. It has also been widely used in vacuum systems. 4 . The operation is convenient, the opening and closing is rapid, and the rotation is 90 ° from full opening to full closing , which is convenient for long-distance control. 5 . The maintenance is convenient, the ball valve has a simple structure, and the sealing ring is generally movable, and the disassembly and replacement are relatively convenient. 6 . When fully open or fully closed, the sealing surface of the ball and the valve seat is isolated from the medium, and the medium does not cause erosion of the sealing surface of the valve. 7 . Since the ball valve is wiping during opening and closing, it can be used in a medium with suspended solid particles.

Ball valve classification and characteristics :

1. Floating ball valve : The ball of the valve is floating. Under the action of medium pressure, the ball can generate a certain displacement and press on the sealing surface at the outlet end to ensure the sealing of the outlet end. The floating ball valve has a simple structure and good sealing performance, but the load of the ball subjected to the working medium is all transmitted to the outlet sealing ring, so it is necessary to consider whether the sealing ring material can withstand the working load of the spherical medium, and when subjected to a high pressure shock. The sphere may be offset. This structure is generally used for medium and low pressure ball valves.

2. three-way ball valve : three-way ball valve has T and L type. The T -type enables three orthogonal pipes to communicate with each other and cut off the third channel to function as a split and merge. The L -shaped can only connect two pipes that are orthogonal to each other, and cannot simultaneously maintain the mutual connection of the third pipe, and only serves as a distribution.