Difference Between Ball And Globe Valve

Ball valves and globe valves are our common valves, but what are the differences between them? Let me tell you about it from ten different aspects.

1. Difference in operation methods: The operating handle of the ball valve can be fully opened or fully closed by rotating 90°, while the stop valve needs to be rotated more than 360° to open or close the valve.
2. Different installation methods: Stop valves are directional when installed. Generally, valves are marked with arrows, and the direction of the arrow represents the direction of medium flow. If there is no mark, the installation should be carried out according to the principle of low in and high out. The stop valve should be installed horizontally with the valve stem facing upwards. The valve stem should not be installed downwards. However, no matter which end of the ball valve is facing upward, a new port will be opened after turning 90 degrees, and the original port will be closed.
3. Different application scenarios: Ball valves can be used in media containing fibers or small solid particles. However, stop valves can be used in gases, liquids, and media containing various corrosive agents.
4. Difference in fluid resistance: Because the fluid resistance of the ball valve is small, its resistance coefficient is the same as that of a pipe of the same length as the ball valve. However, the fluid resistance of the stop valve is relatively large, so it requires relatively large resistance when opening and closing the valve.
5. Different working principles: The opening and closing parts of the ball valve (the parts that regulate the flow of the medium) are spheres. Its sphere is driven by the valve stem and rotates around the axis perpendicular to the valve channel. That is to say, what the ball valve does The movement is rotational. The opening and closing part of the stop valve (the part that regulates the flow of the medium) is the valve disc. Its sealing surface is flat or conical. Its valve stem drives the axis of the sealing surface to move up and down. The valve disc moves along the center line of the fluid. Make linear motion.
6. Difference in sealing performance: The sealing performance of the globe valve is better than that of the ball valve. Because the contact area between the valve disc and the valve seat of the stop valve is large, the pressure it can withstand is relatively high. The contact area between the ball valve's ball and the valve seat is small, and the pressure it can withstand is relatively low, so the sealing performance of the ball valve is worse than that of the globe valve.
7. Differences in repair and maintenance: The repair and maintenance of globe valves are simpler than that of ball valves. Because the structure of the globe valve is relatively simple, the globe valve is easy to disassemble and install. However, the structure of the ball valve is relatively complex and cannot be repaired by ordinary people, so the maintenance and upkeep of the ball valve requires more professional people.
8. Price difference: The price of globe valve is lower than that of ball valve. Because the structure of the stop valve is relatively simple, the cost of manufacturing it in the factory is relatively low, so its price is also low. The structure of the ball valve is relatively complex, and the cost of manufacturing it in the factory is relatively high, so its price is also high.
9. Difference in applicability: Because the stop valve can withstand high pressure, the friction between its sealing surfaces is relatively small, making it more durable and suitable for high-pressure work. The ball valve cannot withstand high pressure, so the friction between its sealing surfaces is relatively large, and its durability is not as good as that of the globe valve. It is more suitable for low-pressure work.
10. Opening and closing speed: The opening and closing speed of the stop valve is slow, because the stop valve needs to rotate more than 360 degrees to open or close the valve. The ball valve opens and closes quickly because the ball valve only needs to rotate 90 degrees to open or close the valve.

What is a ball valve

The ball valve is a valve whose opening and closing parts (parts that regulate the flow of media) are spheres, driven by the valve stem, and rotate around the axis of the ball valve. Ball valve is a very common type of valve, mainly used to control the flow of fluid in pipelines. This kind of valve has already appeared in the 1950s. With the continuous progress and development of science and technology, production technology and product structure have been continuously improved and improved. In these 40 years, it has rapidly developed into a Valves for a wide range of applications. Ball valves are mainly used for the regulation and control of fluids. They have small fluid resistance, good sealing, simple structure, easy maintenance, and a wide range of applications.

1. Structure and operation of ball valve: Ball valve is mainly composed of valve body, valve seat, valve stem, ball, handle and actuator. This kind of valve must be installed horizontally, and the valve can be opened or closed by rotating 90 degrees. The ball of the ball valve is floating. Under the action of medium pressure, the ball can move to a certain extent and press tightly against the sealing surface of the outlet end to ensure the sealing of the outlet end.

2. Driving mode of ball valve: Ball valves are divided into pneumatic ball valves, electric ball valves and manual ball valves according to the driving mode.
Pneumatic ball valve: It uses gas as a source of power to control the opening or closing of the ball valve through a pneumatic actuator. The pneumatic actuator is mainly composed of a cylinder, a piston, a crank arm, and a chain. The ball valve is opened or closed by driving air pressure. Pneumatic ball valves have the advantages of simple structure, small size, light weight, stable action, fast opening and closing, and are widely used in automated control systems.

Electric ball valve: It uses electricity as the source of power to control the opening or closing of the ball valve through an electric motor. The electric ball valve opens or closes the ball valve by rotating the motor. Electric ball valves are mainly used in pipeline systems and automated control systems. Electric ball valves are divided into straight-through type, three-way type and right-angle type according to their structure. It is divided into one-way type and two-way type according to the purpose. According to the function, it is divided into regulating type and switch type,globe valve manufacture.

Manual ball valve: The ball valve is opened or closed manually. Because the operating tool of the manual ball valve is a handle, the ball must be rotated by turning the handle to control the opening or closing of the ball valve. Since manual ball valves have the advantages of simple structure, convenient operation, and low price, ball valves are mainly used in various relatively small pipeline systems.

What is a globe valve

The stop valve is a valve whose opening and closing parts (parts that regulate the flow of media) are valve discs, and the valve stem drives the valve to move up and down along the axis of the valve seat. It is suitable for cutting off or connecting the media in pipelines, and is widely used in petroleum plants, chemical plants, metallurgical plants and hydropower plants. The closing member of the stop valve moves vertically along the axis of the channel. When the medium enters the valve from the bottom of the valve disc, the operating force needs to overcome the friction force of the valve stem and packing and the thrust generated by the pressure of the medium. Because the pressure when the valve is closed is greater than the pressure when the valve is open, the valve stem diameter is larger.

1. Characteristics of stop valve
The stop valve is a forced sealing valve. When closing, pressure must be applied to the system to close the valve.
The medium flow direction of the stop valve can be one-way or two-way, but it is determined by the design and purpose of the valve.
Because the stop valve requires a relatively large force to open and close, it requires a relatively large operating force.
Since the fluid resistance of the stop valve is relatively small, the stop valve is more suitable for large diameter pipelines.
The structure of the stop valve is simple and the price is cheap.

2. Purpose of stop valve
The stop valve can be used to adjust the volume of fluid in the pipeline, mainly by changing the position of the valve disc; it can be used to control the flow direction of the medium in the pipeline, mainly by changing the direction of the stop valve channel; It can prevent the fluid from flowing back and isolate the medium in the pipeline. When the stop valve is closed, it can prevent the fluid in the valve from flowing back and isolate the medium in the pipeline from other parts of the pipeline. It can prevent fluid pressure fluctuations and prevent the fluid in the stop valve from flowing back. When the pressure is relatively high, the stop valve can buffer so that the pipelines and equipment are not affected.

Advantages Of Ball Valves

1. The fluid resistance is small. Because the full-bore ball valve basically has no flow resistance, its fluid resistance is relatively small.
2. Simple structure. The structure of the ball valve is relatively simple. It is small in size and light in weight, making it very convenient for maintenance.
3. Tight and reliable. The ball valve has two sealing surfaces. Because the material of the ball valve's sealing surface is made of various plastics, it has good sealing performance and can achieve complete sealing.
4. Easy to operate, the ball valve opens or closes quickly. It only needs to be rotated 90 degrees to control the opening and closing of the ball valve remotely.
5. Suitable for media with suspended solid particles. Because the ball valve has wiping properties during the opening and closing process, it can be used in media with suspended solid particles.
6. It is not restricted by the installation direction, because the flow direction of the ball valve medium can flow in any direction and the fluid resistance is small, so the ball valve is not restricted by the installation direction.
7. No vibration and low noise. Since ball valves are mainly used to cut off, distribute and change the flow direction of media on pipelines, ball valves designed with V-shaped openings have no vibration and relatively low noise.
8. Good wear resistance and corrosion resistance. Because the valve core and valve seat of the ball valve are made of metal materials or hard plastics, the ball valve has relatively good wear resistance and corrosion resistance and can be used in various applications. in applications with corrosive media.
9. The sealing performance is stable and reliable. Since the sealing material and sealing structure of the ball valve are carefully designed and manufactured by the factory, the sealing performance of the ball valve is stable and reliable, which can ensure a long service life and good sealing effect.
10. The price is economical and affordable. The ball valve uses less materials during the manufacturing process and the installation size is relatively small. Therefore, its manufacturing cost is relatively low and the price is economical and affordable.

Advantages Of Globe Valve

1. The sealing performance is good. The sealing surface of the stop valve is made of relatively good materials. Its sealing structure is also very unique, and the design of the valve disc and valve seat is also reasonable. Therefore, the stop valve can prevent the leakage of media in the pipeline and maintain good sealing.
2. The fluid resistance is small. The design structure of the stop valve uses a circular or rectangular channel. This design can reduce the resistance of the water flow and increase the speed of the water flow.
3. Simple structure. The simple structure of the stop valve is determined by its working principle. Its working principle is also very simple. It is to use the pressure of the valve stem to make the valve disc sealing surface and the valve seat sealing surface fit together. It does not need to be complicated. steps to control the shut-off valve.
4. It has good adjustment performance. The stop valve can change the angle of the valve disc to adjust the fluid in the pipeline and accurately control the fluid in the pipeline.
5. Wide range of applications, the stop valve can be applied to a variety of pipelines and fluid media.
6. High reliability. The stop valve can not only work stably under different working conditions, but also ensure the normal operation of other systems.
7. High reliability. The sealing surface of the stop valve has been carefully processed by the factory and has high wear resistance and corrosion resistance. It can remain stable and reliable in use for a long time.
8. Long life. Since the sealing material and structure of the stop valve are reasonably designed, its use time is relatively long, which also greatly reduces the cost and efficiency of maintenance and replacement.
9. Easy to maintain. The stop valve not only has a simple structure, but also has relatively few parts, so it is very convenient to maintain and can be maintained quickly.
10. The sealing surface is not easy to wear and scratch, and the sealing performance is good. When the stop valve is opened or closed, there is no sliding between the valve disc and the valve body sealing surface, so the wear and scratches are not serious, and the sealing performance is good.