Ball Valves vs. Butterfly Valves

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
Ball Valves vs. Butterfly Valves
Butterfly Valves
Ball Valves vs. 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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