Briefly describe the classification and structure of ball valves


Ball valves include: floating ball valves, fixed ball valves, track 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, antisulfur ball valves, pneumatic ball valves, electric ball valves, sleeve ball valves, welding ball valves.

According to the shell/main material classification, ball valves can be divided into:

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

Doors, aluminum alloy valves, lead alloy valves, etc.

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

3, non-metallic materials valve: such as ceramic valve, glass valve, plastic valve.

The domestic production of ball valve manufacturers are more, the connection size is mostly not unified. It is mainly divided into the following categories:

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

Ball valve structure:

Good sealing, but the ball under the working medium of the load all passed to the outlet sealing ring, so it is necessary to consider whether the sealing ring material can withstand the working load of the ball medium, in the high pressure impact, the ball may be offset. This structure is generally used for medium and low pressure ball valves.

Ball valve ball is fixed, after compression does not produce movement. Fixed ball valves are with floating seat, by medium pressure, seat movement, so that the sealing ring is pressed on the ball, to ensure sealing. It is usually equipped with bearings on the upper and lower shafts of the ball, and the operation torque is small, 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 pressure injection of special lubricating oil, to form a layer of oil film, which enhances the tightness, but also reduces the operating torque, more suitable for high pressure large diameter ball valve.