Brief description of the classification and structure of ball valves


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, sulfur-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, copper alloy valves

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

2, metal body lining 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 production of ball valves are more manufacturers, the connection size is also mostly not uniform. Mainly divided into the following broad categories.

Ball valve ball is floating, under the pressure of the medium, the ball can produce a certain displacement and pressed tightly on the sealing surface of the outlet end to ensure that the outlet end is sealed.

Structure of 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 deflected. This structure, generally used for low and medium pressure ball valves.

The ball valve's ball is fixed and does not move when pressurized. Fixed ball ball valve are with floating seat, after being pressed by medium pressure, the seat produces movement, so that the seal is pressed tightly on the ball to ensure sealing. Usually equipped with bearings on the upper and lower shafts with the ball, 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 oil seal ball valve, both in the sealing surface between the pressure injection of special lubricant 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 valve.