1. Gate Valve
A gate valve uses a wedge-shaped disc (gate) that moves perpendicular to the flow direction to fully open or close the pipeline. It is primarily used for on/off applications and is unsuitable for flow regulation or slurry transport.
Advantages:
Low fluid resistance.
Minimal torque required for operation.
Bidirectional flow capability (no directional restrictions).
Sealing surfaces are less eroded by media when fully open.
Simple structure with straightforward manufacturing.
Compact design (short structural length).
Disadvantages:
Large size and height, requiring significant installation space.
Sealing surfaces wear easily due to friction during operation, especially at high temperatures.
Complex maintenance due to dual sealing surfaces.
Slow operation (long opening/closing time).
2. Butterfly Valve
A butterfly valve uses a disc rotating 90° to regulate or shut off flow. It is widely used in gas pipelines, water systems, and dusty environments.
Advantages:
Compact, lightweight design with low material consumption.
Quick operation and low flow resistance.
Suitable for media with suspended solids (e.g., powders, granules).
Ideal for bidirectional flow regulation in ventilation or dust-removal systems.
Disadvantages:
Limited flow regulation range (e.g., 95% flow at 30% opening).
Unsuitable for high-temperature/pressure systems (max. 300°C, below PN40).
Poor sealing performance compared to ball or globe valves.
3. Ball Valve
A ball valve uses a rotating ball with a bore to control flow. It excels in shutoff, distribution, and flow direction control, with V-port designs offering precise regulation.
Advantages:
Zero fluid resistance when fully open.
Reliable in corrosive or low-boiling-point media (no lubrication needed).
Bidirectional sealing across wide pressure/temperature ranges.
Rapid operation (0.05–0.1s for some models).
Self-aligning ball design ensures tight closure.
Durable in harsh environments (e.g., buried pipelines with 30-year lifespan).
Compact and symmetrical structure minimizes pipeline stress.
Disadvantages:
PTFE seat limitations:
Vulnerable to hardening and thermal degradation (max. 180°C, typically 120°C).
High thermal expansion and poor heat conduction require careful seat design.
Poorer flow regulation compared to globe valves.
4. Globe Valve
A globe valve uses a linear-moving disc to regulate or shut off flow. It is ideal for throttling and frequent operation in steam systems.
Advantages:
Low friction between disc and seat, enhancing durability.
Compact height (1/4 of gate valve's travel distance).
Single sealing surface simplifies manufacturing and maintenance.
High-temperature tolerance (e.g., graphite-asbestos packing).
Disadvantages:
Higher flow resistance due to directional changes in flow.
Slower operation compared to ball valves.
5. Plug Valve
A plug valve uses a cylindrical or conical plug rotated 90° to control flow. It is similar to ball valves but suited for smaller applications.
Advantages:
Quick, lightweight operation.
Low fluid resistance.
Simple design with easy maintenance.
Bidirectional flow with no installation restrictions.
Quiet operation (no vibration or noise).
Disadvantages:
High torque required for large sealing surfaces.
Size limitations due to plug weight (large valves require inverted designs).
Reduced sealing efficiency in inverted large-scale designs.
This comparison highlights key factors to consider when selecting valves for industrial, chemical, or pipeline applications.