Why Should The Globe Valve Be Low in And High Out?

The globe valve is a main valve used in water, oil, gas and other pipeline systems. The flow of the medium is controlled by opening and closing the valve. The main features of the globe valve are good sealing, small pressure loss, simple structure, and easy maintenance. Before use, you should ask the valve manufacturers for detailed instructions on use to avoid incorrect use and reduce work efficiency. For example, in most cases, the globe valve is designed so that the fluid enters from the bottom and flows out from the top. Why is this?

Reasons for low inlet and high outlet

The globe valve is generally installed in the pipeline. In order to ensure that the flow of the fluid in the pipeline is not affected, it is generally low inlet and high outlet.

1. Ensure the stability of the system

The globe valve has a low inlet and a high outlet to ensure the stable flow of the fluid in the pipeline. Since the liquid is denser than the gas, the liquid will be affected by gravity when it moves in the pipeline, and the resistance will also increase, thereby increasing the pressure loss of the fluid. Letting the globe valve have a low inlet and a high outlet can reduce the flow resistance of the fluid, reduce pressure loss, and ensure the stability of the system.

2. Prevent air and impurities from entering the pipeline

The globe valve has a low inlet and a high outlet and can also effectively prevent air and impurities from entering the pipeline. When the pipeline system fails or shuts down for maintenance, there will be a certain pressure difference in the pipeline. If the valve position is reversed, the gas and impurities in the pipeline will enter the pipeline, affecting the normal operation of the pipeline.

3. Convenient installation and maintenance

The low-inlet and high-outlet globe valve can be easily installed and maintained. During installation, the low-position valve is generally installed first, and then the high-position valve is installed, which can facilitate installation and maintenance and reduce risks and costs.

High-inlet and low-out in special cases

In some special cases, the globe valve will also adopt a high-inlet and low-out design. For example, for high-pressure globe valves with a diameter greater than 100 mm, due to the poor sealing performance of large-diameter valves, the high-inlet and low-out design can increase the sealing of the valve in the closed state. In addition, in the two globe valves in series on the bypass pipeline, the second globe valve usually adopts a high-inlet and low-out design to ensure the tightness of the valve within a maintenance cycle, especially in valves that require frequent opening and closing operations.

Summary

The globe valve is an important control valve in the pipeline system. The installation method of the globe valve with low inlet and high outlet can effectively ensure the stable flow of fluid in the pipeline and prevent air and impurities from entering the pipeline. It also facilitates the installation and maintenance of the globe valve. Therefore, when using the globe valve in the pipeline system, you must pay attention to its installation method of low inlet and high outlet.