What is a ball valve
A ball valve uses a sphere with a circular passage as its opening and closing member, which rotates with the valve stem to open and close. The opening and closing member is a sphere with a hole in it, which rotates around an axis perpendicular to the passage, thereby opening and closing the passage. Ball valves are primarily used to open and close media in pipelines and equipment.
What is a butterfly valve
A butterfly valve is a type of throttle valve that controls the flow of fluid or adjusts the flow rate by rotating a disc-shaped butterfly plate around its axis.
Ball Valve vs Butterfly Valve
1. Structural Differences
- Ball Valve: The valve core is a sphere with a through hole, which controls the flow of media by rotating 90°. Typical configurations include floating (DN ≤ 200mm) and fixed (DN ≥ 200mm). Sealing materials are typically PTFE or metal seals.
- Butterfly Valve: The valve core is a disc-shaped disc, also operated by rotating 90°, but with a simpler structure. Based on the sealing type, it is categorized as either soft (rubber/PTFE) or metal. The valve body is typically wafer-shaped or flange-type.
2. Comparison of key performance parameters
| Index | Ball Valve | Butterfly Valve |
| Pressure level |
PN16~PN420(API 600) |
PN6~PN40(ISO 5752) |
| Temperature range |
-196℃~550℃ |
-30℃~200℃(Soft Seal) |
| Leakage level |
ANSI VI(Hard Seal) |
ANSI IV(Soft Seal) |
| Flow resistance coefficient |
0.05~0.3 |
0.2~0.6 |
3.Application Scenarios and Features
Butterfly Valve:
Advantages: Simple structure, easy to manufacture and maintain; fast opening and closing, flexible operation; suitable for low-pressure environments; excellent flow control function; easy to automate; low cost.
Disadvantages: Relatively poor sealing (but this can be improved with soft and hard seals); suitable only for low-pressure environments (maximum pressure generally does not exceed 64 kg).
Application Scenarios: Butterfly valves are typically used in applications requiring rapid opening and closing and flow control, such as ventilation systems, air conditioning systems, and water supply and drainage systems.
Ball Valve:
Advantages: Compact structure, small size, and light weight; fast opening and closing, easy operation; excellent sealing performance and high-pressure resistance; suitable for a variety of fluid media; easy to remotely control.
Disadvantages: Relatively high cost; may not be as flexible as butterfly valves in applications requiring frequent flow control.
Application Scenarios: Ball valves are widely used in industries such as petroleum, chemical, power, and metallurgy, as well as in public utilities such as municipal water supply and gas supply.
