What is the difference between globe valve and gate valve

What is the difference between globe valve and gate valve. Globe valves, gate valves, butterfly valves, check valves and ball valves are all indispensable control components in various pipeline systems. Each valve is different in appearance, structure and even functional use. However, the globe valve and the gate valve have some similarities in appearance, and both have the function of cutting off in the pipeline, so many friends who have little contact with the valve will confuse the two. In fact, if you look closely, the difference between a globe valve and a gate valve is quite big. This article will introduce the difference between globe valve and gate valve.

1. The difference between the working principle of globe valve and gate valve

When the globe valve is opened and closed, it is a rising valve stem type, that is to say, when the handwheel is turned, the handwheel will rotate and lift together with the valve stem. The gate valve rotates the handwheel to make the valve stem move up and down, and the position of the handwheel itself remains unchanged.
In addition, the gate valve has only two states: fully open or fully closed, the gate opening and closing stroke is large, and the opening and closing time is long. The movement stroke of the valve plate of the globe valve is much smaller, and the valve plate of the globe valve can stop at a certain place during the movement for flow regulation. The gate valve can only be used for truncation and has no other functions.

2. The performance difference between globe valve and gate valve

The globe valve can be used for both cut-off and flow regulation. The fluid resistance of the globe valve is relatively large, and it is more laborious to open and close, but because the distance between the valve plate and the sealing surface is short, the opening and closing stroke is short.
Because the gate valve can only be fully opened and fully closed, when it is fully opened, the medium flow resistance in the valve body channel is almost 0, so the opening and closing of the gate valve will be very labor-saving, but the gate is far away from the sealing surface, and the opening and closing time is long. .

3. The difference between the installation flow direction of the globe valve and the gate 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 globe valve needs to be installed in strict accordance with the direction marked by the arrow on the valve body. There is also a clear regulation on the direction of the import and export of the globe valve. The "three chemical supply" of valves in my country stipulates that the flow direction of the globe valve shall be from top to bottom.

4. The structure difference between globe valve and gate valve

The structure of the gate valve will be more complicated than that of the globe valve. From the perspective of appearance, the gate valve is taller than the globe valve and the globe valve is longer than the gate valve under the same diameter. In addition, gate valves are divided into open rods and dark rods. The shut-off valve does not.