In this article from Linquip, we want to talk about the difference between gate valve and globe valve. These two valves are among the popular valves that are used for many industrial and residential applications. They provide many useful services that differ from each other. While similar in appearance, they function differently. By comparing these two, you will be able to know these differences better.
What is a Gate Valve?
Gate valves are linear valves belonging to the shutoff valve family. Characterized by its wedge-like disc, the gate valve is commonly used for isolating media because of can tightly seal off media. This kind of valve can be used in applications where tight sealing is required. A special kind of gate valve, a knife gate valve, is used in thicker and more viscous media.
What is a Globe Valve?
The globe valve is also a member of the linear motion valve family. Its functions include stopping and starting media as well as regulating the flow of media. Because of its design, the globe valve provides a tight seal with fewer chances of leakage.
The globe valve is aptly named as such because of its traditional body design similar to that of the globe. But as one gate valve China manufacturer would tell you, however, modern globe valves may adapt to other body shapes. A plug-like disc allows or prohibits the flow of media.
Globe Valve vs Gate Valve
Working Principles of Globe Valve vs Gate Valve
Whenever the globe valve opens and closed, the valve stem is lifted, i.e., as the handwheel is rotated, the handwheel rotates and lifts along with the valve stem. The gate valve rotates the handwheel to allow the valve stem to go up and down, and the position of the handwheel does not alter.
The gate valve only has two states that are completely open or completely shut. The opening and closing strokes of the gate is quite wide and the opening and closing time is very long; the movement of the valve plate of the globe valve is much shorter and the valve plate of the globe valve will stop at a certain position during movement. For one, it is used for flow adjustment, while the gate valve can only be used for shut-off and has no other function.
Installation and Flow of Gate Valve vs Globe Valve
The gate valve has the same effect in both directions. There is no requirement for the direction of the inlet and outlet, and the medium can flow in both directions. The shut-off valve needs to be installed in strict accordance with the direction indicated by the arrow on the valve body. There is also a clear stipulation on the direction of the inlet and outlet of the shut-off valve.
The globe valve is low-in and high-out. From the outside, it is obvious that the pipeline is not on a phase horizontal line. The gate valve runner is on a horizontal line. The gate valve has a larger stroke than the stop valve.
There are two ways for the shut-off valve during installation. One is that the medium can enter from under the valve core. The advantage is that when the valve is closed, the packing is not under pressure, which can extend the service life of the packing, and can bear pressure in the pipeline in front of the valve. Under the circumstances, the replacement of packing is performed; the disadvantage is that the driving torque of the valve is large, which is about 1 time of the upper flow, the axial force on the valve stem is large, and the valve stem is easy to bend. Therefore, this method is generally only applicable to small-diameter globe valves (below DN50), and globe valves above DN200 use the method of the medium flowing from above. (The electric shut-off valve generally uses the medium to enter from above.) The disadvantage of the medium to enter from above is exactly the opposite of the way to enter below.
Performance Difference of Globe Valve versus Gate Valve
Globe valves are control valves, meaning they can start, stop, and regulate media, giving the operator full control of media flow. The primary function of gate valves is to isolate media. Its design does not cater to flow control.
Sealed of Globe vs Gate Valve
The sealing surface of the globe valve is a small trapezoidal side of the valve core (depending on the shape of the valve core). Once the valve core falls off, it is equivalent to closing the valve (if the pressure difference is large, of course, the closing is not strict, but the check valve effect is not bad). The gate valve is sealed by the side of the valve disc. The sealing effect is not as good as that of a shut-off valve.
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