How to Distinguish the Globe Valve and Gate Valve
As two essential types of valve in industrial and civil pipeline systems, globe valves and gate valves both play a crucial role in controlling the flow of fluids. However, they have their own characteristics in regards of structure, operating principle, and applicable scenarios. Analysis of the similarities and differences between the two will provide us with a more informed choice in practical operations.
Gate valve vs globe valve: structure differences.
Gate Valve: It consists of the valve body, gate, valve stem, and handwheel. The structure of the gate valve is relatively complex, and its height and dimension are larger. The medium passage inside the valve body is straight-through.
Globe Valve: Its structure is more simple, mainly composed of a valve body, a valve disc, a valve stem, etc.The disc is core component. The channel inside the valve body is rather tortuous.
Gate valve vs globe valve: operating principles.
Gate Valve: The valve is opened and closed by the up-and-down movement of the gate. Howerver when the gate is opened, it completely withdraws from the fluid passage; when it is closed, it fits closely with the valve seat. The gate valve is required to be fully open or fully closed, and it cannot regulate the flow rate.
Globe Valve: The valve’s opening and closing are also controlled by the up-and-down movement of the valve stem. The globe valve drives the valve disc to move through the lifting of the valve stem, changing the space between the valve disc and the valve seat, thus realizing the cut-off and regulation of the fluid. The globe valve can be in a semi-open state and has some regulating function.
Gate valve vs globe valve: sealing surface.
Gate valve: The sealing surface is prone to wear. Especially when it is close to being closed, the pressure difference before and after the pipeline is large, and the wear is more serious. However, the sealing surface of the gate valve has a certain self-sealing ability.
Globe valve: The mechanical wear of the sealing surface is relatively small. But if the medium contains solid particles, it is likely to damage the sealing surface.
Gate valve vs globe valve: fluid resistance.
Gate valve: It has very little resistance to the fluid and can be opened and closed flexibly.
Globe valve: Due to the tortuous channel inside the valve body, the fluid resistance is relatively large.
Gate valve vs globe valve: application.
Globe Valve: It is suitable for occasions where precise flow control is required, such as in pipeline systems that are frequently opened and closed or require flow regulation. Its excellent sealing performance makes it suitable for environments with high pressure, high temperature, and corrosive media.
Gate Valve: It is suitable for occasions require fully open or fully closed , such as pipeline systems that are not frequently operated. Its low flow resistance characteristic makes it suitable for large-diameter and large-flow pipeline systems.
Gate valve vs globe valve: installation method.
Gate valve: There is no distinction in the installation direction, and the medium can flow in either direction on both sides.
Globe valve: It has a directional characteristic. Generally, the medium flows in from below the valve disc and flows out from above.
Gate valve vs globe valve: appearance.
Gate Valve: Taller body with a shorter structural dimension.
Globe Valve: Shorter body with a longer structural length.
Advantages and disadvantages of gate valve and globe valve
Globe Valve: The advantages include good sealing performance and strong regulating performance; however, it has a relatively large flow resistance, and the opening and closing torque is also quite large.
Gate Valve: The advantages lie in its low flow resistance and easy opening and closing torque; but it should be noted that its sealing performance is relatively poor, and it is not suitable for flow regulation.
In conclusion, globe valves and gate valves have their own advantages and characteristics comparing in structure, operating principle, and applicable scenarios. When making a choice, it is necessary to consider specific working conditions and operation requirements.
