What is the difference between a globe valve and a gate valve?
Release time：
2023-01-31 11:06
What is the difference between a globe valve and a gate valve? Valves are control components in fluid conveying systems that have functions such as cutoff, regulation, diversion, prevention of reverse flow, pressure stabilization, diversion, or overflow pressure relief. The valves used in fluid control systems range from the simplest globe valves to various valves used in extremely complex automatic control systems, with a wide variety of varieties and specifications.
Stop valve, gate valve, butterfly valve, check valve and ball valve are all indispensable control components in various Plumbing. Each type of valve has differences in appearance, structure, and even functional use. But there are some similarities in the appearance of globe valves and gate valves, and both have the function of cutting off in pipelines. Therefore, many friends who have little contact with valves may confuse the two. In fact, if you carefully observe, the difference between globe valves and gate valves is quite significant.
1. Structurally
When the installation space is limited, it is important to pay attention to the selection. The gate valve can rely on the medium pressure to tightly close the sealing surface, thus achieving the effect of no leakage. When opening and closing, the sealing surface of the valve core and valve seat always contacts and rubs against each other, making the sealing surface easy to wear. When the gate valve is close to closing, the pressure difference between the front and rear of the pipeline is large, making the sealing surface wear more severe.
2. Working principle
When the shut-off valve is opened and closed, it is an upward stem type, which means that when the handwheel is turned, it will rotate and lift along with the valve stem. And the gate valve rotates the handwheel to make the valve stem move up and down, while the position of the handwheel itself remains unchanged. The flow rate varies, and gate valves require full opening or full closing, while globe valves do not. The shut-off valve has specified inlet and outlet directions; There is no requirement for the inlet and outlet direction of the gate valve.
In addition, the gate valve only has two states: fully open or fully closed, and the opening and closing stroke of the gate plate is large, resulting in a long opening and closing time. The travel of the valve plate of the shut-off valve is much smaller, and the valve plate of the shut-off valve can stop at a certain position during movement for flow regulation. The gate valve can only be used for cutting off and has no other functions.
The structure of a gate valve is more complex than that of a globe valve. From the appearance, under the same caliber, the gate valve is taller than the globe valve, and the globe valve is longer than the gate valve. In addition, there are two types of gate valves: open stem and non rising stem. The shut-off valve is not available.
3. Performance Differences
The shut-off valve can be used for both cut-off and flow regulation purposes. The fluid resistance of the shut-off valve is relatively high, making it difficult to open and close. However, due to the short distance between the valve plate and the sealing surface, the opening and closing stroke is short.
The gate valve can only be fully opened and fully closed. When fully opened, the medium flow resistance in the valve body channel is almost zero, so the opening and closing of the gate valve will be very labor-saving. However, the distance between the gate plate and the sealing surface is far, and the opening and closing time is long.
4. Installation and Flow Direction
The flow direction of the gate valve has the same effect in both directions, and there is no requirement for inlet and outlet direction during installation. The medium can flow in both directions. Globe valves need to be installed strictly in accordance with the direction indicated by the arrow on the valve body. There is also a clear regulation regarding the inlet and outlet directions of globe valves. According to the "Three Chemicals" regulations for valves in China, the flow direction of globe valves is always from top to bottom.
The shut-off valve is low in and high out, starting from
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