The Uses of Ball Valves
What Is the Ball Valve?
The ball of the ball valve is driven by the stem and around the axis of the stem to do a rotating motion. It is called the ball valve.
Ball valves also are plug valves with spherical closing parts. The valve seat matching the ball is round, so the sealing stress on the circumference is the same. Most of the ball valves use soft seats that fit well with the surface of the ball such as PTFE and nylon. Therefore, from the point of view of sealing, the concept of the ball valve is very excellent.
The circular orifice between the circular seat and the double pressure drop of the two seats produces better flow control characteristics. If the valve is partially opened for a sustained period of time under conditions of high pressure drop at both ends of the ball, the soft seal along the edge of the ball hole may slip and may trap the ball in this position. Therefore, manually controlled ball valves are most suitable for switching on and cutting off fluid media and for moderate throttling. If the flow control is automatic and the sphere is in continuous motion, these disadvantages can usually be avoided.
Ball valves can be used in media with suspended particles because of the wiping action of the ball between the seat. However, abrasive solid particles can damage the seat and ball surface. The common ball valves are also problematic for media with longer and more ductile fibrous materials that may become entangled in the ball.
For economical construction, most of the ball valves have retracted openings and venturi runner sizes of approximately 3/4 of their nominal size. Retraction ball valves have a low pressure loss so there is usually no reason to incur the additional cost of using full-diameter ball valves. However, there are occasions when non-reduced ball valves must be used. For example, full-diameter ball valves must be used when pipe pigging is required.
What are the uses of ball valves?
What are the uses of ball valves? The ball valve is the most significant development in recent decades. The ball valve has been widely used in long-distance pipelines. The medium flow direction of ball valves is not restricted. The pressure and diameter range of use are wide, but the use of temperature is limited by the material and constraints of sealing rings. Through ball valves are used for truncating medium and are the most widely used. The multiway ball valve can change the direction of media flow or distribution.
Due to the appearance of hard sealed ball valve, the applicable pressure and temperature of the ball valve have been greatly increased. The applicable temperature is from -50 to 200℃, which can increase to -200 to 450℃, and even 600 to 700℃. The applicable pressure is from PN40, which can increase to PN320, especially with the emergence of a variety of lined ball valves. Then, the applicable medium of the ball valve is further expanded.
In particular, large-diameter ball valves have moved beyond the concept of traditional use for bleeding and cut-off. They are increasingly being developed to replace traditional throttling globe valves. With the development of the structure of the ball valve and the development of materials, especially the improvement of the internal structure, its scope of use is also expanded. In the process industry of throttling, it has broken the dominance of globe valves. It has become the control valve industry in the field of the fastest development of a valve. This is because of the rotation of 90 degrees, the opening and closing ball valve has greater advantages in flow control than the globe valve.
1. Unlike the globe valve, it is easy to pull the packing and discharge medium when opening and closing the valve stem through the packing. It is easy to make the valve stem corrode in the atmosphere.
2. Due to the development of driving devices and positioner technology, especially the application of computer-integrated processing systems (CTPEM), including ball valve rotation 90 degrees, the opening and closing valves are more suitable for use in control systems.
3. Large adjustment range. The flow adjustment range of ball valves of the same size is 10 to 20 times larger than that of globe valves. The flow control range of ball valves is 100:1.
4. With a wide range of specifications and series, it can be used for the control of various media including mud particle medium.
The ball of the ball valve is driven by the stem and around the axis of the stem to do a rotating motion. It is called the ball valve.
Ball valves also are plug valves with spherical closing parts. The valve seat matching the ball is round, so the sealing stress on the circumference is the same. Most of the ball valves use soft seats that fit well with the surface of the ball such as PTFE and nylon. Therefore, from the point of view of sealing, the concept of the ball valve is very excellent.
The circular orifice between the circular seat and the double pressure drop of the two seats produces better flow control characteristics. If the valve is partially opened for a sustained period of time under conditions of high pressure drop at both ends of the ball, the soft seal along the edge of the ball hole may slip and may trap the ball in this position. Therefore, manually controlled ball valves are most suitable for switching on and cutting off fluid media and for moderate throttling. If the flow control is automatic and the sphere is in continuous motion, these disadvantages can usually be avoided.
Ball valves can be used in media with suspended particles because of the wiping action of the ball between the seat. However, abrasive solid particles can damage the seat and ball surface. The common ball valves are also problematic for media with longer and more ductile fibrous materials that may become entangled in the ball.
For economical construction, most of the ball valves have retracted openings and venturi runner sizes of approximately 3/4 of their nominal size. Retraction ball valves have a low pressure loss so there is usually no reason to incur the additional cost of using full-diameter ball valves. However, there are occasions when non-reduced ball valves must be used. For example, full-diameter ball valves must be used when pipe pigging is required.
What are the uses of ball valves?
What are the uses of ball valves? The ball valve is the most significant development in recent decades. The ball valve has been widely used in long-distance pipelines. The medium flow direction of ball valves is not restricted. The pressure and diameter range of use are wide, but the use of temperature is limited by the material and constraints of sealing rings. Through ball valves are used for truncating medium and are the most widely used. The multiway ball valve can change the direction of media flow or distribution.
Due to the appearance of hard sealed ball valve, the applicable pressure and temperature of the ball valve have been greatly increased. The applicable temperature is from -50 to 200℃, which can increase to -200 to 450℃, and even 600 to 700℃. The applicable pressure is from PN40, which can increase to PN320, especially with the emergence of a variety of lined ball valves. Then, the applicable medium of the ball valve is further expanded.
In particular, large-diameter ball valves have moved beyond the concept of traditional use for bleeding and cut-off. They are increasingly being developed to replace traditional throttling globe valves. With the development of the structure of the ball valve and the development of materials, especially the improvement of the internal structure, its scope of use is also expanded. In the process industry of throttling, it has broken the dominance of globe valves. It has become the control valve industry in the field of the fastest development of a valve. This is because of the rotation of 90 degrees, the opening and closing ball valve has greater advantages in flow control than the globe valve.
1. Unlike the globe valve, it is easy to pull the packing and discharge medium when opening and closing the valve stem through the packing. It is easy to make the valve stem corrode in the atmosphere.
2. Due to the development of driving devices and positioner technology, especially the application of computer-integrated processing systems (CTPEM), including ball valve rotation 90 degrees, the opening and closing valves are more suitable for use in control systems.
3. Large adjustment range. The flow adjustment range of ball valves of the same size is 10 to 20 times larger than that of globe valves. The flow control range of ball valves is 100:1.
4. With a wide range of specifications and series, it can be used for the control of various media including mud particle medium.
