Pneumatic ball valves evolved from plug valves. It has the same rotation of 90 degrees, except that the plug body is a sphere with a circular through hole or passage through its axis. The ratio of spheres to channel openings should be such that when the ball is rotated 90 degrees, all spheres should be present at the entrance and exit, thus cutting off the flow. This type of valve can be installed anywhere in the pipe.
working principle
Pneumatic ball valves only need to be closed tightly with a pneumatic actuator that rotates by 90 degrees with a pneumatic source and a small rotational torque. The completely equal valve body cavity provides a small, straight flow path for the medium. It is generally considered that ball valves are most suitable for opening and closing directly, but recent developments have designed the ball valve to be used for throttling and controlling flow. The main characteristics of the ball valve are its compact structure, easy operation and maintenance, suitable for general working medium such as water, solvent, acid and natural gas, and also suitable for working medium with poor working conditions such as oxygen, hydrogen peroxide, methane and ethylene. The ball valve body can be integral or modular.
The practical role of pneumatic ball valve
Pneumatic ball valve works by rotating the valve to make the valve open or blocked. Pneumatic ball valve is light and compact, can be made into a large diameter, reliable sealing, simple structure, easy maintenance, sealing surface and spherical surface often in the closed state, non-pneumatic ball valve easily eroded by media, widely used in various industries.
Pneumatic ball valve and plug valve are the same type of valve, only its closing part is a ball, the ball rotates around the center line of the valve body to open and close a valve.
Pneumatic ball valve is mainly used in the pipeline to do fast cutting, distributing and changing the flow direction of the medium. Pneumatic ball valve is a new valve that has been widely used in recent years. It has the following advantages:
1. The fluid resistance is small, and its drag coefficient is equal to the length of the same length.
2. Simple structure, small size, light weight.
3. It is compact and reliable. At present, the sealing surface material of the ball valve is widely used with plastics and has good sealing performance. It has also been widely used in vacuum systems.
4. Easy to operate, fast opening and closing, as long as the rotation from 90 degrees from full open to fully closed, easy remote control.
5. Easy maintenance, pneumatic ball valve structure is simple, the seal ring is generally active, removal and replacement are more convenient.
6. When fully open or fully closed, the sealing surfaces of the ball body and the valve seat are isolated from the medium. When the medium passes through, the sealing surface of the valve will not be eroded.
7. Wide range of applications, from small to several millimeters in diameter, up to a few meters in size, from high vacuum to high pressure can be applied.
8. Because the pneumatic ball valve power source uses gas, generally 0.2-0.8MPa pressure, relatively safe. If the pneumatic ball valve leaks, the gas can be directly discharged relative to the liquid dynamics and the electric power. It has no pollution to the environment and has high safety.
9. Pneumatic ball valves can be configured in large diameters relative to manual and turbine turning ball valves (manual and turbine ball valves are generally below DN300, pneumatic ball valves can currently reach DN1200).
Pneumatic ball valves have been widely used in petroleum, chemical, power generation, paper, atomic energy, aviation, rockets and other departments, as well as people's daily lives.
Pneumatic valve can be divided according to the structure:
1. The ball of the pneumatic ball valve of the floating pneumatic ball valve is floating. Under the action of the medium pressure, the ball can generate a certain displacement and press on the sealing surface of the outlet end to ensure the sealing of the outlet end.
The structure of the floating pneumatic ball valve is simple and the sealing is good. However, the load of the ball bearing the working medium is all 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. This structure is widely used in low and medium pressure ball valves.
Second, fixed ball pneumatic ball valve ball valve is fixed, no movement after pressure. 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 pneumatic ball valve and increase the reliability of the seal, oil seal ball valves have appeared in recent years. The special lubricant is injected between the sealing surfaces to form a layer of oil film, which enhances the sealing performance and reduces the operation. Torque, more suitable for high pressure large diameter ball valve.
Third, the elastic ball pneumatic ball valve ball ball is elastic. The ball body and the valve seat seal ring are made of metal materials, and the specific pressure of the seal is large. The pressure of the medium itself cannot meet the requirements of the seal, and external force must be applied. This valve is suitable for high temperature and high pressure media.
The elastic ball is to open a flexible groove at the lower end of the inner wall of the ball to obtain elasticity. When closing the channel, use the wedge head of the valve stem to make the ball expand and seal with the valve seat. Loosen the wedge head before turning the ball, the ball will return to its original shape, so that there is a small gap between the ball and the valve seat, which can reduce the friction and operating torque of the sealing surface.
Pneumatic ball valve according to its position can be divided into straight-through, three-style and right-angle. The latter two ball valves are used to distribute media and change the direction of the media.
working principle
Pneumatic ball valves only need to be closed tightly with a pneumatic actuator that rotates by 90 degrees with a pneumatic source and a small rotational torque. The completely equal valve body cavity provides a small, straight flow path for the medium. It is generally considered that ball valves are most suitable for opening and closing directly, but recent developments have designed the ball valve to be used for throttling and controlling flow. The main characteristics of the ball valve are its compact structure, easy operation and maintenance, suitable for general working medium such as water, solvent, acid and natural gas, and also suitable for working medium with poor working conditions such as oxygen, hydrogen peroxide, methane and ethylene. The ball valve body can be integral or modular.
The practical role of pneumatic ball valve
Pneumatic ball valve works by rotating the valve to make the valve open or blocked. Pneumatic ball valve is light and compact, can be made into a large diameter, reliable sealing, simple structure, easy maintenance, sealing surface and spherical surface often in the closed state, non-pneumatic ball valve easily eroded by media, widely used in various industries.
Pneumatic ball valve and plug valve are the same type of valve, only its closing part is a ball, the ball rotates around the center line of the valve body to open and close a valve.
Pneumatic ball valve is mainly used in the pipeline to do fast cutting, distributing and changing the flow direction of the medium. Pneumatic ball valve is a new valve that has been widely used in recent years. It has the following advantages:
1. The fluid resistance is small, and its drag coefficient is equal to the length of the same length.
2. Simple structure, small size, light weight.
3. It is compact and reliable. At present, the sealing surface material of the ball valve is widely used with plastics and has good sealing performance. It has also been widely used in vacuum systems.
4. Easy to operate, fast opening and closing, as long as the rotation from 90 degrees from full open to fully closed, easy remote control.
5. Easy maintenance, pneumatic ball valve structure is simple, the seal ring is generally active, removal and replacement are more convenient.
6. When fully open or fully closed, the sealing surfaces of the ball body and the valve seat are isolated from the medium. When the medium passes through, the sealing surface of the valve will not be eroded.
7. Wide range of applications, from small to several millimeters in diameter, up to a few meters in size, from high vacuum to high pressure can be applied.
8. Because the pneumatic ball valve power source uses gas, generally 0.2-0.8MPa pressure, relatively safe. If the pneumatic ball valve leaks, the gas can be directly discharged relative to the liquid dynamics and the electric power. It has no pollution to the environment and has high safety.
9. Pneumatic ball valves can be configured in large diameters relative to manual and turbine turning ball valves (manual and turbine ball valves are generally below DN300, pneumatic ball valves can currently reach DN1200).
Pneumatic ball valves have been widely used in petroleum, chemical, power generation, paper, atomic energy, aviation, rockets and other departments, as well as people's daily lives.
Pneumatic valve can be divided according to the structure:
1. The ball of the pneumatic ball valve of the floating pneumatic ball valve is floating. Under the action of the medium pressure, the ball can generate a certain displacement and press on the sealing surface of the outlet end to ensure the sealing of the outlet end.
The structure of the floating pneumatic ball valve is simple and the sealing is good. However, the load of the ball bearing the working medium is all 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. This structure is widely used in low and medium pressure ball valves.
Second, fixed ball pneumatic ball valve ball valve is fixed, no movement after pressure. 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 pneumatic ball valve and increase the reliability of the seal, oil seal ball valves have appeared in recent years. The special lubricant is injected between the sealing surfaces to form a layer of oil film, which enhances the sealing performance and reduces the operation. Torque, more suitable for high pressure large diameter ball valve.
Third, the elastic ball pneumatic ball valve ball ball is elastic. The ball body and the valve seat seal ring are made of metal materials, and the specific pressure of the seal is large. The pressure of the medium itself cannot meet the requirements of the seal, and external force must be applied. This valve is suitable for high temperature and high pressure media.
The elastic ball is to open a flexible groove at the lower end of the inner wall of the ball to obtain elasticity. When closing the channel, use the wedge head of the valve stem to make the ball expand and seal with the valve seat. Loosen the wedge head before turning the ball, the ball will return to its original shape, so that there is a small gap between the ball and the valve seat, which can reduce the friction and operating torque of the sealing surface.
Pneumatic ball valve according to its position can be divided into straight-through, three-style and right-angle. The latter two ball valves are used to distribute media and change the direction of the media.
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