Dec. 09, 2022
Globe valves and gate valves are the most frequently used valves in piping systems, and some people may be confused about them due to their similarities in structural construction, material grades, internals and other technical specifications. The following will teach you how to distinguish between globe valves and gate valves.
Globe valves can be used to start, stop and regulate flow. They get their name from the shape of the valve body itself. In operation, the conical plug moves in and out of the fluid stream. The flow is controlled by the distance between the plug and its base. The operator should be careful not to turn the valve spindle too far or the seat could be damaged.
They provide greater resistance to fluid flow and have a high pressure drop even when the valve is fully open.
Gate valves can be used to start and stop flow, but they cannot regulate flow levels. However, they are actually designed to isolate or connect fluids. Part of the flow is not something that is ideally managed through a gate valve, as this can damage the gate and introduce vibration.
They get their name from the way they operate, with the gate sliding between the seats at right angles to the fluid flow. The shape of the gate can be wedge-shaped, knife-shaped or parallel.
Whenever a globe valve opens and closes, the stem is lifted, i.e., as the handwheel rotates, the handwheel rotates and lifts with the stem. Gate valves turn the handwheel so that the stem moves up and down and the handwheel position remains the same.
The gate valve has only two states, fully open and fully closed. The gate opening and closing stroke is quite wide and the opening and closing time is very long; the valve plate movement of the globe valve is much shorter, and the valve plate of the globe valve stops at a certain position during the movement. One is used to regulate the flow, while the gate valve can only play a globe role, no other role.
Globe valve can be used to cut off and regulate the flow. The fluid resistance of the globe valve is larger, opening and closing is more difficult, but because the gap between the valve plate and the sealing surface is smaller, the opening and closing stroke is also smaller.
Gate valves can only be fully opened and closed. Once fully open, the fluid flow resistance in the valve body pathway is almost zero, so the gate valve is very effortless to open and close, but the gate is far from the sealing surface, opening and closing time are large.
In both directions, the role of the gate valve is the same. Installation of the inlet and outlet direction is not required, the medium can flow in both directions.
The installation of the globe valve must fully comply with the position indicated by the arrow on the valve body. The inlet and outlet position of the globe valve is also simply specified.
The structure of the gate valve will be more complex than the globe valve. From the design point of view, the gate valve is higher than the globe valve, the globe valve is longer than the gate valve. In addition, the gate valve is divided into open stem and concealed stem.
The small trapezoidal side of the spool is the sieve surface of the valve. Once the spool is off, it is equivalent to closing the valve. Gate valves seal on the surface of the valve flap. Sealing effect is not as good as the effect of the globe valve.
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