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Brief description of the classification and structure of ball valves

2023-01-13 13:25

Ball valves are divided into: floating ball ball valves, fixed ball ball valves, orbital ball valves, V-shaped ball valves, three-way ball valves, stainless steel ball valves, cast steel ball valves, forged steel ball valves, ash discharge ball valves, sulphur resistant ball valves, pneumatic ball valves, electric ball valves, ferrule ball valves, welded ball valves.

According to the classification of shell/body material, ball valves can be divided into.

1, metal material valves: such as carbon steel valves, alloy steel valves, stainless steel valves, cast iron valves, titanium alloy valves, Monel valves, brass alloy valves

Valves, aluminum alloy valves, lead alloy valves, etc.

2, metal body lined valves: such as rubber lined valves, fluorine lined valves, lead lined valves, plastic lined valves, enamel lined valves.

3, non-metallic material valves: such as ceramic valves, glass valves, plastic valves.

Domestic manufacturers of ball valves are relatively large, and the connection size is mostly not uniform. Mainly divided into the following broad categories.

Ball valve ball is floating, under the action of media pressure, the ball can produce a certain displacement and pressed tightly on the sealing surface of the export end to ensure that the export end seal.

Structure of the ball valve.

Good sealing, but the ball body to bear the load of the working medium is all transmitted to the outlet seal, so consider whether the seal material can withstand the working load of the ball medium, in the case of higher pressure impact, the ball may be offset. This structure, generally used for low and medium pressure ball valves.

The ball of the ball valve is fixed and does not move when pressurised. Fixed ball ball valves all come with a floating seat which, when pressurised by the medium, produces movement of the seat so that the seal is pressed tightly against the ball to ensure sealing. Usually equipped with bearings on the upper and lower shafts with the ball body, the operating torque is small and suitable for high pressure and large diameter valves.

In order to reduce the operating torque of the ball valve and increase the reliability of the seal, and the emergence of the oil seal ball valve, both in the sealing surface between the pressure injection of special lubricants to form a layer of oil film, that is, to enhance the sealing, but also to reduce the operating torque, more suitable for high pressure and large diameter ball valves.