We all know there are various types of valves for different applications. Today, we are going to know more about the difference between ball valves and globe valves.
Ball valve uses a ball with a circular channel to open and close as the ball rotates with the valve stem and around the axis perpendicular to the channel. Most of the ball valve packing is graphite. With good resilience and chemical stability, it provides effective sealing effect.
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The globe valve is a forced sealing valve, consisting of a movable plug or disc element and a stationary ring seat in a generally spherical body. Its opening and closing parts (discs) along the center line of the valve seat channel up and down. The force to close the valve is greater than the force to open the valve. Therefore, the diameter of the valve stem should be large, in case the valve stem top bends.
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Ball Valves vs. Globe Valves |
① Appearance The ball valve is round, which controls the valve on and off by screwing the valve. Controlled by turning the lever, the globe valve has a lever switch which just like an ordinary faucet. ②The way of controlling the flow The ball valve controls the flow by moving the base through the rotation of the bearing. In order to block the flow, the globe valve rotates the lever on the valve to change the position of the diaphragm. ③ Sealing The sealing performance of the globe valve is better than that of the ball valve. ④Opening the valve When the globe valve starts to open, it needs a lot of force, because its resistance will be larger. The ball valve is easier to rotate because of its small resistance. All in all, ball valves and globe valves have their own characteristics, please purchase them according to your own needs. |
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What is the difference between ball valves and butterfly valves? Here are some points for your reference, which might be helpful for most ball valve buyers when they select produts.
What are Ball Valves & Butterfly Valves?
Ball Valves |
Butterfly Valves |
1.Main Characteristics |
(1) Ball Valves |
The main characteristics of the ball valve are its compact structure, easy operation and maintenance. And it’s small in size, volume, and fluid resistance
(2) Butterfly Valves
Butterfly valve has the characteristics of simple structure, small volume, light weight, low material consumption, small installation size, fast switch, 90 ° reciprocating rotation, small driving torque, etc.
2.Working Principles |
(1) Ball Valves
The ball valve has the same action of rotating 90 degrees, but the difference is that the cock body is a sphere with a circular through hole or channel through its axis. The ball valve is mainly used to cut off, distribute and change the flow direction of medium in the pipeline. It can be closed tightly only by rotating 90 degrees and a small rotating torque. Ball valves are most suitable for use as switch and shut-off valves, but recent developments have designed ball valves to throttle and control flow, such as V-shaped ball valves.
(2) Butterfly Valves
It is based on the quick shut off principle. The disc of the valve is placed in the center of the pipe which allows a rod to go through it to an actuator, on the outer side of the valve. The disc remains parallel or perpendicular to the flow. A pressure drop is introduced by the disc upon the flow even when open.
3.Typical Applications |
(1) Ball Valves
Air, gaseous, and liquid applications requiring bubble-tight service.
Low-point drains and high-point vents in liquid, gaseous, and other fluid services. Instrument root valves. Cooling water and feed water systems. |
(2) Butterfly Valves
Cooling water, air, gases, fire protection
Slurry and similar services Vacuum service High-pressure and high-temperature water and steam services Compressed Air or Gas Applications |
4. Advantages&Disadvantages
The Ball Valve | The Butterfly Valve | |
Weight | Very heavy | Light weight at even larger pipe diameter |
Size | Better suitable for small diameter | Suitable for larger diameter(above DN 150) |
Leakage | Provides tight seal | Prone to leakages at a high -pressure difference |
Cost | More expensive | Cheaper than a ball valve |
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