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Advantages and disadvantages of gate valves
Advantages of gate valves:
(1) The fluid resistance is small because the internal medium channel of the gate valve body is straight through, and the flow direction of the medium through the gate valve does not change, so the fluid resistance is small.
(2) The opening and closing torque is small, and it is easier to open and close because the direction of the gate movement is perpendicular to the direction of the medium flow when opening and closing the gate valve. Compared with the globe valve, the opening and closing of the gate valve is easier.
(3) The flow direction of the medium is not restricted, and the medium can flow in any direction from both sides of the gate valve without disturbance or pressure reduction, achieving the purpose of use. It is more suitable for pipelines where the flow direction of the medium may change.
(4) The structural length is shorter because the gate of the gate valve is vertically placed inside the valve body, while the valve disc of the globe valve is horizontally placed inside the valve body, so the structural length is shorter than that of the globe valve.
(5) Good sealing performance, the sealing surface is less eroded when fully opened.
(6) When fully open, the sealing surface is less susceptible to erosion by the working medium than the globe valve.
(7) The body shape is relatively simple, the casting process is good, and it has a wide range of applications.
Disadvantages of gate valves:
(1) The sealing surface is prone to damage, and there is relative friction between the two seals that come into contact with the gate and valve seat during opening and closing, which can easily damage the sealing components and affect their service life, making maintenance difficult.
(2) The opening and closing time is long, and the height is large. Due to the need to fully open or close the gate valve when opening and closing, the stroke of the gate plate is large, and a certain amount of space is required for opening. The external dimensions are high, and the installation space is large.
(3) Generally, gate valves with complex structures have two sealing surfaces, which add some processing, grinding, and maintenance. They have more difficult parts, making manufacturing and maintenance more challenging, and have higher costs than globe valves.
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