What is the different Globe and Gate valves
Globe valve, gate valve, butterfly valve, check valve and ball valve are indispensable control components in various pipeline systems. Each valve is different in appearance, structure and even functional use. However, the globe valve and gate valve have some similarities in appearance, and both have the function of cutting off in the pipeline. Therefore, many friends who have little contact with the valve will confuse the two. In fact, if you observe carefully, the difference between stop valve and gate valve is quite big. This article introduces the difference between globe valve and gate valve.
Difference in structure
When the installation space is limited, attention should be paid to the selection. The gate valve can be tightly closed with the sealing surface by medium pressure, so as to achieve the effect of no leakage. When opening and closing, the sealing surface of the valve core and the valve seat always contact and rub against each other, so the sealing surface is 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 wear of the sealing surface more serious.
The structure of the gate valve will be more complex than the globe valve. From the appearance, in the case of the same diameter, the gate valve is higher than the globe valve, and the globe valve is longer than the gate valve. In addition, the gate valve can be divided into exposed rod and concealed rod. The globe valve is not.
Difference Working principle
When the globe valve is opened and closed, it is a rising stem type, that is, rotate the handwheel, and the handwheel will rotate and rise and fall with the valve stem. The gate valve rotates the hand wheel to make the valve stem rise and fall, and the position of the hand wheel itself remains unchanged. The flow is different. The gate valve is required to be fully open or fully closed, while the globe valve is not required. The globe valve has specified inlet and outlet directions; The gate valve has no inlet and outlet direction requirements.
In addition, the gate valve is only fully open or fully closed. The opening and closing stroke of the gate valve 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 stop valve can stop at a certain place during movement for flow regulation. The gate valve can only be used for cut-off without other functions.
The globe valve can be used for both cut-off and flow regulation. The fluid resistance of the globe valve is relatively large and the opening and closing is laborious, but the opening and closing stroke is short because the distance between the valve plate and the sealing surface 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 is very labor-saving, but the gate is far from the sealing surface and the opening and closing time is long.
Difference Installation and flow direction
The effect of gate valve flow direction is the same in both directions. There is no requirement for inlet and outlet direction during installation, and the medium can flow in both directions. The stop valve needs to be installed in strict accordance with the direction marked by the arrow of the valve body. There is also a written provision on the inlet and outlet direction of the stop valve. The “three modernizations” of valves in China stipulates that the flow direction of the stop valve shall be from top to bottom.
The globe valve is low in and high out. From the appearance, it is obvious that the pipeline is not on the same phase horizontal line. The gate valve flow path is on a horizontal line. The stroke of the gate valve is larger than that of the globe valve.
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