Gate Valve
Advantages
1.They can provide an unobstructed flow in the fully open position so pressure loss is minimal.
2.They are bi-directional and allow uniform linear flows.
3.No residues are left in the pipes.
4.Gate valves can withstand higher pressures compared to butterfly valves
5.It prevents water hammer because the wedge has a slow operation.
Disadvantages
1.Can only be completely open or completely closed with no allowed adjustments for the medium flow.
2.The operation speed is slow due to the gate valve’s high opening height.
3.The valve’s seat and gate will erode badly when kept in the partially open state.
4.More expensive compared to butterfly valves especially in large sizes.
5.They occupy a larger space for the installation and operation compared to butterfly valves.
Butterfly Valve
Advantages
1.Can be used for throttling fluid flows and can control the flow easily.
2.Suitable for applications under moderate to high temperature and pressure conditions.
3.Light-weight and compact design requiring less space for installation.
4.Fast operation time which is ideal for emergency shut-offs.
5.More affordable in large sizes.
Disadvantages
1.They leave residual materials in the pipeline.
2.The thickness of the valve’s body creates resistance which obstructs the medium flow and causes the pressure to drop even if the valve is fully open.
3.The movement of the disc is unguided so it is affected by the flow turbulence.
4.Thick liquids can prevent the movement of the disc as it is always along the flow path.
5.Possibility of water hammers.
Conclusion
Gate valves and butterfly valves have their own strengths and weaknesses depending on the application requirements where they are going to be installed. In general, gate valves are ideal for applications that need strict sealing only and do not need frequent operation especially when an unobstructed flow is desired. But if you need a valve for throttling purposes that occupy less space for huge systems, large butterfly valves would be ideal.
For the majority of applications, butterfly valves are more extensively used. Water-seal Valve offers high-performance butterfly valves in different end-type connection, material body, seat, and disc designs. Feel free to contact us for further questions about our products.
Post time: Jan-17-2022