The working principle of the ball valve is to make the valve open or blocked by rotating the ball. Ball valve switch light, small size, can be made into a large caliber, reliable sealing, simple structure, easy maintenance, sealing surface and sphere are often in a closed state, not easy to be washed by the medium, in various industries have been widely used.

Ball valve can be roughly divided into 19 categories, There are floating ball valve, fixed ball valve, metal hard seal ball valve, V-type ball valve, sandwich ball valve, insulated ball valve, pipeline ball valve, track ball valve, mounted ball valve, cleaning 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, all welded ball valve, special ball valve, etc.

O-type ball valve adopts floating structure, the ball core is precision casting, the surface is plated with hard chromium, the seat is made of metal or reinforced polytetrafluoroethylene material, the caliber of the runner and the pipeline is the same, the flow capacity is very large, the flow resistance is very small, no leakage when closed, generally used as an on-off valve, especially suitable for high viscosity, fiber, granular media.

V-shaped ball valve adopts fixed structure, and V-shaped incision is opened on the ball core, which can realize proportional adjustment, and the flow characteristic is approximately equal percentage.

Ball valve has a wide range of application, ball valve can be applied to:

1, nominal diameter from 8mm to 1200mm.

2, nominal pressure from vacuum to 42MPa.

3, the operating temperature from -204℃ to 815℃.

Especially in the petroleum, chemical, metallurgical and other departments, the use of soft seal ball valves in flammable and explosive media equipment and piping systems should pay more attention to fire resistance and fire prevention.

Generally, ball valves are recommended in two-position adjustment, strict sealing performance, mud, wear, shrinking channels, rapid opening and closing action (1/4 turn opening and closing), high pressure cutoff (large pressure difference), low noise, cavitation and gasification phenomenon, small leakage to the atmosphere, small operating torque, and small fluid resistance pipeline systems.

Ball valves are also suitable for lightweight structures, low pressure cut-off (small pressure difference), corrosive media piping systems.

Ball valves are also available in low temperature (cryogenic) devices and piping systems.

Ball valves of special structure with V-shaped openings should be selected when regulating performance is required.

In petroleum, petrochemical, chemical, electric power, and urban construction, metal-to-metal sealed ball valves can be selected for piping systems with operating temperatures above 200 ° C.

In the oxygen piping system of the metallurgical industry, ball valves with strict degreasing treatment are required.

When the main line in the oil pipeline and gas pipeline needs to be buried underground, the full-diameter welded ball valve should be used.

Ball valves are widely used in irrigation systems, mainly in branch pipe inlet. Ball valve has simple structure, small size, and small resistance to water flow. The disadvantage is that it is opened or closed too fast, which will generate water hammer in the pipeline (the pressure will rise when the water flow speed in the pipeline changes suddenly). Therefore, ball valves should not be used on the main pipe, which can be used for washing on the dry and branch pipes or their ends, and the flushing effect is good.

Ball valve selection applicable principles:

1, oil, natural gas transmission main line, need to clean the pipeline, but also buried in the ground, choose full diameter, all welded structure ball valve; Buried on the ground, choose full-diameter welded connection or flange connection ball valve; Branch pipe, choose flange connection, welded connection, full pass or reduced diameter ball valve.

2, the product pipeline and storage equipment, the use of flanged ball valve connection.

3, the city gas and natural gas pipeline, the use of flange connection and internal thread connection of the floating ball valve.

4. In the oxygen piping system of the metallurgical system, it is appropriate to select the fixed ball valve with strict degreasing treatment and flange connection.

5, the pipeline system and device of low temperature medium should be selected with a low temperature ball valve cover.

6. On the pipeline system of the catalytic cracking unit of the refining unit, the lifting rod ball valve can be selected.

7. In the installation and piping system of corrosive media such as acid and alkali in the chemical system, it is appropriate to choose all stainless steel ball valves made of austenitic stainless steel and polytetrafluoroethylene for the seat sealing ring.

8, metallurgy system, power system, petrochemical equipment, urban heating system in the high-temperature medium pipeline system or device, can choose metal to metal sealing ball valve.

9, need to adjust the flow, can choose worm gear drive, pneumatic or electric with V-shaped opening adjustment ball valve.

The working principle of the ball valve is to make the valve open or blocked by rotating the ball. Ball valve switch light, small size, can be made into a large caliber, reliable sealing, simple structure, easy maintenance, sealing surface and sphere are often in a closed state, not easy to be washed by the medium, in various industries have been widely used.

Ball valve can be roughly divided into 19 categories, There are floating ball valve, fixed ball valve, metal hard seal ball valve, V-type ball valve, sandwich ball valve, insulated ball valve, pipeline ball valve, track ball valve, mounted ball valve, cleaning 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, all welded ball valve, special ball valve, etc.

O-type ball valve adopts floating structure, the ball core is precision casting, the surface is plated with hard chromium, the seat is made of metal or reinforced polytetrafluoroethylene material, the caliber of the runner and the pipeline is the same, the flow capacity is very large, the flow resistance is very small, no leakage when closed, generally used as an on-off valve, especially suitable for high viscosity, fiber, granular media.

V-shaped ball valve adopts fixed structure, and V-shaped incision is opened on the ball core, which can realize proportional adjustment, and the flow characteristic is approximately equal percentage.

Ball valve has a wide range of application, ball valve can be applied to:

1, nominal diameter from 8mm to 1200mm.

2, nominal pressure from vacuum to 42MPa.

3, the operating temperature from -204℃ to 815℃.

Especially in the petroleum, chemical, metallurgical and other departments, the use of soft seal ball valves in flammable and explosive media equipment and piping systems should pay more attention to fire resistance and fire prevention.

Generally, ball valves are recommended in two-position adjustment, strict sealing performance, mud, wear, shrinking channels, rapid opening and closing action (1/4 turn opening and closing), high pressure cutoff (large pressure difference), low noise, cavitation and gasification phenomenon, small leakage to the atmosphere, small operating torque, and small fluid resistance pipeline systems.

Ball valves are also suitable for lightweight structures, low pressure cut-off (small pressure difference), corrosive media piping systems.

Ball valves are also available in low temperature (cryogenic) devices and piping systems.

Ball valves of special structure with V-shaped openings should be selected when regulating performance is required.

In petroleum, petrochemical, chemical, electric power, and urban construction, metal-to-metal sealed ball valves can be selected for piping systems with operating temperatures above 200 ° C.

In the oxygen piping system of the metallurgical industry, ball valves with strict degreasing treatment are required.

When the main line in the oil pipeline and gas pipeline needs to be buried underground, the full-diameter welded ball valve should be used.

Ball valves are widely used in irrigation systems, mainly in branch pipe inlet. Ball valve has simple structure, small size, and small resistance to water flow. The disadvantage is that it is opened or closed too fast, which will generate water hammer in the pipeline (the pressure will rise when the water flow speed in the pipeline changes suddenly). Therefore, ball valves should not be used on the main pipe, which can be used for washing on the dry and branch pipes or their ends, and the flushing effect is good.

Ball valve selection applicable principles:

1, oil, natural gas transmission main line, need to clean the pipeline, but also buried in the ground, choose full diameter, all welded structure ball valve; Buried on the ground, choose full-diameter welded connection or flange connection ball valve; Branch pipe, choose flange connection, welded connection, full pass or reduced diameter ball valve.

2, the product pipeline and storage equipment, the use of flanged ball valve connection.

3, the city gas and natural gas pipeline, the use of flange connection and internal thread connection of the floating ball valve.

4. In the oxygen piping system of the metallurgical system, it is appropriate to select the fixed ball valve with strict degreasing treatment and flange connection.

5, the pipeline system and device of low temperature medium should be selected with a low temperature ball valve cover.

6. On the pipeline system of the catalytic cracking unit of the refining unit, the lifting rod ball valve can be selected.

7. In the installation and piping system of corrosive media such as acid and alkali in the chemical system, it is appropriate to choose all stainless steel ball valves made of austenitic stainless steel and polytetrafluoroethylene for the seat sealing ring.

8, metallurgy system, power system, petrochemical equipment, urban heating system in the high-temperature medium pipeline system or device, can choose metal to metal sealing ball valve.

9, need to adjust the flow, can choose worm gear drive, pneumatic or electric with V-shaped opening adjustment ball valve.

(Source: Machinery expert network)

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