Advantages and disadvantages of globe valves

Advantages and disadvantages of globe valves

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Advantages of globe valves
a、 Compared with gate valves, globe valves have a simpler structure, usually with only one sealing surface on the valve body and disc, which has a smaller sealing area, saves valuable materials, and is low-cost. Therefore, the manufacturing process is better and easier to maintain.
b、 The wear and abrasion of the sealing surface are relatively light, and the sealing performance is good. When opening and closing, there is no relative sliding between the valve disc and the sealing surface of the valve body (except for the conical sealing surface), so the wear and abrasion are not serious, the sealing performance is good, and the service life is long.
c、 The opening height is small, usually only 1/4 of the diameter of the valve seat channel, with a compact structure that saves installation controls.
Disadvantages of globe valves
a、 The structural length is relatively long.
b、 The opening and closing torque is large, making it difficult to open and close. When closing, because the direction of valve disc movement is opposite to the direction of medium pressure, the force of the medium must be overcome, so the opening and closing torque is large.
c、 High flow resistance. The medium channel inside the valve body is relatively tortuous, with high flow resistance and power consumption, especially in hydraulic devices, where this pressure loss is particularly significant. Among various types of shut-off valves, the shut-off valve has the highest flow resistance.
d、 The flow direction of the medium is restricted. When the medium flows through the shut-off valve, it can only flow from bottom to top or from top to bottom at the valve seat channel, so the medium can only flow in one direction and cannot change the flow direction.
e、 When the valve is closed, solid particles in the fluid medium may be trapped between the sealing surfaces.
f、 Installation is inconvenient.