The classification and structure of ball valves are briefly described
Ball valves include: floating ball valve, fixed ball valve, track 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, sulfur resistant ball valve, pneumatic ball valve, electric ball valve, ferrule ball valve and welded ball valve.
According to the classification of shell / main body materials, 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 and copper alloy valves
Doors, 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 and enamel lined valves.
3. Non metallic valves: such as ceramic valves, glass valves and plastic valves.
There are many domestic manufacturers of ball valves, and most of the connection sizes are not unified. It is mainly divided into the following categories:
The ball of the ball valve is floating. Under the action of medium pressure, the ball can produce a certain displacement and press tightly on the sealing surface of the outlet end to ensure the sealing of the outlet end.
Structure of ball valve:
The sealing performance is good, but the load of the working medium borne by the ball 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 impacted by high pressure, the ball may deviate. This structure is generally used for medium and low pressure ball valves.
The ball of the ball valve is fixed and does not move after being pressurized. Fixed ball valves are equipped with floating valve seats. After being subjected to medium pressure, the valve seats move, so that the sealing ring is tightly pressed on the ball to ensure sealing. Bearings are usually installed on the upper and lower shafts of the ball, with small operating torque. It is suitable for high-pressure and large-diameter valves.
In order to reduce the operating torque of the ball valve and increase the reliability of sealing, an oil sealed ball valve appears. It not only injects special lubricating oil between the sealing surfaces to form an oil film, which not only enhances the sealing performance, but also reduces the operating torque. It is more suitable for high-pressure and large-diameter ball valves.
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