How to choose a
globe valve?
Before choosing a shut-off valve, you need to determine its purpose, whether the valve is used to regulate or stop the flow of fluid, and then you need to determine the type of medium circulating in the system: gas or liquid? Is the medium corrosive, chemically neutral, food or medical liquid requiring special hygiene conditions?
When it comes to operating the valve, one needs to know whether it is manual or automatic. In the first case, someone has to operate the valve on site, in the other case, the valve can be operated remotely, eg from a control station.
It is also important to understand how the valve will be integrated into the system, and the type of assembly or installation used, especially if welding, bolting through flanges or screwing in is required.
Once these various elements are identified, it is possible to focus on the technical characteristics of the installation, especially flow and pressure, which are used to size the valve.
How to calculate the size of the globe valve?
In order to calculate the size of the valve, parameters related to the operation of the circuit need to be known. Pressure is an important factor that must be taken into account, on the one hand to avoid under-sizing the valve, which would cause problems with valve leakage or rupture, and on the other hand to avoid over-sizing the valve.
The operating temperature, that is, the temperature of the circulating medium and the ambient temperature around the valve body, needs to be determined; it is also necessary to know the extreme temperatures that the valve needs to withstand in order to select a valve that can operate under these conditions, especially for the manufacture of valve bodies, closing systems and The material of the seal should be more cautious.
What are the key points of purchase?
Generally, when customers choose a globe valve, the staff will first remind that the working pressure cannot be ignored, that is, the pressure of the medium circulating in the valve. Paying attention to the flow rate and flow rate of the fluid, flow rate and speed rating are essential elements to help select the right valve, especially one designed to regulate that flow. The flow coefficient is a theoretical value specified by the manufacturer, and the nominal flow of the valve can be calculated. It can be expressed in liters/minute or cubic meters per hour. The valve manufacturer provides a chart to determine the coefficient based on the required flow and nominal diameter.
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