Where are the ball valves used?

 

The ball valve came out in the 1950s. With the rapid development of science and technology, the continuous improvement of production technology and product structure, in a short period of 50 years, it has rapidly developed into a major valve category. In the developed western countries, the use of ball valves is increasing year by year.

 

 

Application of ball valve

The ball valve is mainly used to cut off, distribute and change the flow direction of the medium in the pipeline. It only needs to rotate 90 degrees and a small torque to close tightly. Ball valves are most suitable for use as on-off and shut-off valves.

 

Since the ball valve usually uses rubber, nylon and polytetrafluoroethylene as the seat sealing ring material, its use temperature is limited by the seat sealing ring material. The cut-off function of the ball valve is accomplished by pressing the metal ball against the plastic seat under the action of the medium (floating ball valve). Under the action of certain contact pressure, the seat sealing ring has elastic-plastic deformation in some areas. This deformation can compensate the manufacturing accuracy and surface roughness of the ball, and ensure the sealing performance of the ball valve.

 

In addition, since the seat sealing ring of the ball valve is usually made of plastic, when selecting the structure and performance of the ball valve, the fire resistance and fire resistance of the ball valve must be considered, especially in the petroleum, chemical, metallurgical and other sectors, in the flammable and explosive media. Ball valves are used in the equipment and piping systems, and more attention should be paid to fire and fire resistance.

 

 

Classification of ball valves

Ball valves are divided into: floating ball valve, fixed ball valve, orbital ball valve, V-shaped ball valve, three-way ball valve, stainless steel ball valve, cast steel ball valve, forged steel ball valve, ash unloading ball valve, anti-sulfur ball valve, card sleeve ball valve, welded ball valve.

 

 

 

Ball valve characteristics

1. Has the lowest flow resistance (actually zero).

2. It will not be stuck when there is no lubricant, so it can be reliably used in corrosive media and low boiling point liquids.

3. 100% sealing can be achieved in a larger pressure and temperature range.

4. It can realize ultra-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 opening and closing the valve quickly, there is no shock in operation.

5. The ball type closure can be automatically positioned in position.

6. The working medium is reliably sealed on both sides.

7. When fully open and fully closed, the sealing surface of the ball and the valve seat is isolated from the medium, so the medium passing through the valve at high speed will not cause erosion of the sealing surface.

8. With compact structure and light weight, it can be considered as the most reasonable valve structure suitable for cryogenic medium systems.

 

 

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