Valves play an important role in pipeline systems, primarily used to control the flow of fluids. They ensure the safety, stability, and efficient operation of systems by regulating flow, opening and closing fluid passages, preventing backflow, adjusting pressure, isolating pipelines, sealing to prevent leaks, diverting and merging flows, controlling temperature, and alleviating vibration and shock. Different types of valves, such as globe valves, check valves, ball valves, and butterfly valves, are widely used in various fluid control systems to protect equipment and improve operational efficiency.
Valves can be classified in various ways based on different standards. Below are common classification methods:
Types of Valves
Classification by Operating Principle
- Globe Valve: Controls fluid flow by rotating the valve handle, suitable for flow regulation.
- Ball Valve: Uses a ball with a hole to control the flow, known for quick opening and closing.
- Butterfly Valve: Regulates fluid flow by rotating a circular disc inside the valve body, commonly used in large diameter pipelines.
- Gate Valve: Controls flow by raising or lowering a gate, suitable for complete shut-off.
- Check Valve: Prevents backflow of fluid, commonly used to prevent reverse flow.
- Safety Valve: Protects the system from overpressure by automatically releasing excess pressure.
- Needle Valve: Fine-tunes the flow using a needle-shaped stem.
- Pressure Regulating Valve: Adjusts the system’s pressure to maintain stability.
Classification by Valve Body Structure
- Straight-Through Valve: Fluid flows through the valve in a relatively straight path, with a simple structure.
- Angle Valve: Fluid flows at a 90-degree angle, typically used for pipeline turns.
- Y Valve: Valve body shaped like a “Y,” used for situations with significant pipeline angle changes.
Classification by Connection Type
- Flanged Valve: Connected to the pipeline via flanges, suitable for medium to high-pressure systems.
- Threaded Valve: Connected to the pipeline via threads, suitable for small diameter and low-pressure systems.
- Welded Valve: Connected to the pipeline by welding, suitable for applications requiring higher sealing performance and strength.
Classification by Working Pressure
- Low Pressure Valve: Used in low-pressure systems, typically with a working pressure below 1.6 MPa.
- Medium Pressure Valve: Used in medium-pressure systems, with a working pressure between 1.6-6.4 MPa.
- High Pressure Valve: Used in high-pressure systems, with a working pressure above 6.4 MPa.
Classification by Actuation Type
- Manual Valve: Controlled manually, suitable for regulating smaller flow rates.
- Electric Valve: Controlled by an electric actuator, suitable for automation systems.
- Pneumatic Valve: Driven by compressed air, commonly used in applications requiring quick response.
- Hydraulic Valve: Driven by hydraulic pressure, suitable for high-pressure systems.
Conclusion
Valve classification helps select the appropriate type based on specific needs, ensuring the efficiency and safety of fluid control systems.
If you have any further inquiries regarding valves, please feel free to contact us.
