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Improved sealability and reduced operating torque

- May 29, 2018 -

Ball valves are divided into: floating ball valve, fixed ball valve, track ball valve, V-ball valve, three-way ball valve, stainless steel ball valve, cast steel ball valve, forged steel ball valve, ash ball valve, sulfur ball valve, pneumatic ball valve, electric ball valve, card sleeve Ball valve, welded ball valve.

Classified by shell/body material, ball valves can be divided into:

1. Valves made of metal materials: such as carbon steel valves, alloy steel valves, stainless steel valves, cast iron valves, titanium alloy valves, Monel valves, copper alloy valves, aluminum alloy valves, and lead alloy valves.

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

3. Non-metallic valve: such as ceramic valves, glass valves, plastic valves.

There are many domestic manufacturers of ball valves, and most of the connection sizes are not uniform. Mainly divided into the following categories:

The ball of the ball valve is floating. Under the effect of medium pressure, the ball can produce a certain displacement and press on the sealing surface of the outlet end to ensure the sealing of the outlet end.

Sealing is good, but the load of the ball bearing the working medium is transmitted to the outlet sealing ring. Therefore, it is necessary to consider whether the sealing ring material can withstand the working load of the ball medium. When the ball is subjected to high pressure, the ball may be displaced. . This structure is generally used for low and medium pressure ball valves.

The sphere of the ball valve is fixed and does not move after being pressed. The fixed ball ball valve has a floating valve seat. After the medium pressure, the valve seat moves and the seal ring is pressed against the ball to ensure the seal. Bearings are usually mounted on the upper and lower shafts of the ball, and the operating 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, an oil seal ball valve has appeared. The special lubricant is pressed between the sealing surfaces to form a layer of oil film, which enhances the sealing performance and reduces the operating torque. Suitable for high pressure and large diameter ball valve.

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