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Ball valve selection standard


Ball valve selection standard
The classification of ball valves is roughly as follows: floating ball valve, fixed ball valve, metal hard-sealed ball valve, V-shaped ball valve, wafer ball valve, insulation ball valve, pipeline ball valve, orbital ball valve, top-loading ball valve, pigging valve, high pressure forged ball valve, Three-way (four-way) ball valve, internal thread ball valve, integral ball valve, low temperature ball valve, bellows ball valve, eccentric half ball valve, fully welded ball valve, special ball valve, etc.
The O-type ball valve adopts a floating structure, the ball core is precision casting, the surface is plated with hard chrome, the valve seat is made of metal or reinforced PTFE material, the flow channel opening is the same as the diameter of the pipeline, the flow capacity is large, the flow resistance is extremely small, closed When there is no leakage, it is generally used as an on-off valve, especially for high-viscosity, fiber-containing and granular media.
The V-shaped ball valve adopts a fixed structure, and there is a V-shaped cut on the ball core, which can realize proportional adjustment, and the flow characteristics are approximately equal percentages.
Ball valves have a wide range of applications, and ball valves can be used for:
1. The nominal diameter is from 8mm to 1200mm.
2. The nominal pressure ranges from vacuum to 42MPa.
3. The working temperature is from -204°C to 815°C.
Especially in the petroleum, chemical, metallurgical and other departments, when using soft-sealed ball valves in equipment and pipeline systems with flammable and explosive media, more attention should be paid to fire resistance and fire protection.
Usually, in two-position adjustment, strict sealing performance, mud, wear, shrinking channel, quick opening and closing (1/4 turn opening and closing), high pressure cut-off (large pressure difference), low noise, cavitation and gasification, Ball valves are recommended for pipeline systems with small amount of leakage to the atmosphere, small operating torque and small fluid resistance.
The ball valve is also suitable for the pipeline system of light structure, low pressure cut-off (small pressure difference) and corrosive medium.
Ball valves can also be used in cryogenic (cryogenic) installations and piping systems.
When the adjustment performance is required, a ball valve with a special structure with a V-shaped opening should be selected.
In petroleum, petrochemical, chemical, electric power, and urban construction, metal-to-metal sealed ball valves can be used in pipeline systems with operating temperatures above 200 °C.
In the oxygen pipeline system in the metallurgical industry, ball valves that have undergone strict degreasing treatment are required.
When the main line in the oil pipeline and the gas pipeline needs to be buried underground, a full-bore welded ball valve should be used.
Ball valves are widely used in irrigation systems, mainly at the inlet of branch pipes. The ball valve has a simple structure, small volume, and small resistance to water flow. The disadvantage is that it opens or closes too quickly, which will cause water hammer in the pipeline (the pressure will rise when the water flow speed in the pipeline changes suddenly).Therefore, it is not suitable to use a ball valve on the main pipe. It can be used for flushing on the trunk, branch pipes or their ends, and the effect of flushing and sewage is good.
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The above is the selection standard of ball valve shared with you today. If it is helpful to you, please collect and forward it as soon as possible~


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