1. The difference between the working principle of the globe valve
and the gate valve
. When the globe valve is opened and closed, it is a rising valve stem type. When the handwheel is turned, the handwheel will rotate and lift together with the valve stem; while the gate valve is to rotate the handwheel to make the valve When the rod moves up and down, the position of the handwheel itself remains unchanged. The gate valve has only two states of fully open or fully closed. The opening and closing stroke of the gate is large and the opening and closing time is long; the movement stroke of the valve plate of the stop valve is much smaller, and the valve plate of the stop valve can stop at a certain position during the movement. One, it is used for flow regulation, while 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. 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 zero, 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 of the globe valve and the gate valve is different. The flow direction of the gate valve has the same effect in both directions. The installation does not require 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 inlet and outlet of the globe valve. The 'three chemical processes' of valves in my country stipulate 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, but globe valves do not.
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