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In order to get the best performance from a valve it is essential that the correct valve is selected for the service required. There are a number of different conditions and variables to consider in order to select the appropriate valve for a specific application. These variables will largely be dictated by service conditions and necessary materials of construction. When considering service conditions the first step is identifying what type of medium will be handled. Different valve designs are better suited to liquid while others are preferred for gas. If it is a liquid, it is important to determine whether or not it will contain any solid particulate matter. It is also important to note whether the media will remain liquid throughout the flow or whether it will vaporize and become a gas along the way. Another variable to consider is what the pressure and temperature will be throughout the handling system. This will not only dictate the correct type about but also what material the valve should be constructed from. For example, at extremely high temperatures it may be necessary to use ceramics or refractory metals. At very low temperatures bronze or stainless steel may be required. The widest selection of construction materials falls in the intermediate range. This ranges from 150 to 1000 degrees Fahrenheit. The materials that can be used in this temperature range include carbon steel, cast iron, PVC plastic, and bronze. Along with considering the primary function of the valves it is also important to consider additional variables which may affect the basic material selection. These variables include any necessary corrosion resistance requirements, thermal shock limits, physical shock limits, and potential fire hazards. In most cases these variables can be addressed both through the initial construction material as well as trim materials. Finally, it is important to take a close look at what the valve is being asked to do. The first broad category of valve functions is on/off. Essentially it's only purpose is to start and stop the flow of the medium being transported. The best valve designs for this include gate, stem, disc, plug, and ball valves. Another common purpose is throttling. Throttling valves are used as flow regulators and are required to handle increased flow resistance when closed. Globe, angle, slurry, and butterfly valves are all possible options. In the end, selecting the appropriate valve is primarily dictated by environmental variables, the medium being transported, the expected function, and surrounding service conditions. About the Author: My name is Rosario Berry, a professional freelance writer, like to introduce Korea VF Engineering . There are a number of different conditions and variables to consider in order to select the appropriate Valve for a specific application.
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