The globe valve and gate valve have some similarities in appearance, and both have the function of cutting off in the pipeline, so people often wonder, what is the difference between a globe valve and a gate valve? Globe valves, gate valves, butterfly valves, check valves and ball valves, etc. These valves are now indispensable control components in various piping systems. Every kind of valve whether in appearance,
The globe valve and gate valve have some similarities in appearance, and both have the function of cutting off in the pipeline, so people often wonder, what is the difference between a globe valve and a gate valve?
Globe valves, gate valves, butterfly valves, check valves and ball valves, etc. These valves are now indispensable control components in various piping systems. Each valve is different in appearance, structure and even functional purpose. However, the globe valve and the gate valve have some similarities in appearance, and both have the function of cutting off in the pipeline. Therefore, many friends who have not much contact with the valve will confuse the two . In fact, if you look carefully, the difference between the globe valve and the gate valve is quite big. The editor of this article will introduce the difference between globe valve and gate valve.
1. The difference in working principle of globe valve and gate valve
When the shut-off valve is opened and closed, the stem rises. Turn the handwheel, and the handwheel will rotate and lift with the valve stem; while the gate valve rotates the handwheel to make the valve stem move up and down, and the handwheel itself is in position constant.
The gate valve has only two states of fully open or fully closed. The opening and closing stroke of the gate is very 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 position during movement. For one, it is used for flow adjustment, while the gate valve can only be used for cut-off and has no other functions.
2. The performance difference between globe valve and gate valve
The shut-off valve can be used for cut-off and flow adjustment. 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.
The gate valve can only be fully opened and fully closed. When it is fully opened, the flow resistance of the medium 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 installation flow direction difference between globe valve and gate valve
The effect of the gate valve in both directions is the same. There is no requirement for the inlet and outlet directions for installation, and the medium can flow in both directions.
The stop 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 regarding the direction of the inlet and outlet of the stop valve. China's valve " San Hua " stipulates that the flow direction of the stop valve is 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 shut-off valve. From the appearance point of view, the gate valve is taller than the shut-off valve, and the shut-off valve is longer than the gate valve. In addition, the gate valve is divided into a bright rod and a dark rod .