A pressure reducing regulator is used in many industrial applications. In this article, we look at key parameters that must be established to help you make the appropriate selection of a pressure reducing regulator for your application.
Key parameters to consider when selecting a pressure reducing regulator include:
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When you know the outlet pressure, you will be able to establish the following:
The inlet pressure, both the minimum and maximum pressure, helps establish the:
If the inlet pressure fluctuates significantly, it can have an effect on the:
The required flow capacity affects the following decisions:
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It is important to know the fluid properties like its chemical composition, molecular structure, corrosive properties, flammability, impurities, and so forth. These will guide you to select the correct materials that will come in contact with the process fluid.
Fluid temperature can help determine the materials used in the pressure regulator. For instance, standard regulators use Steel and Nitrile or Neoprene elastomers that are good for a temperature range of -40° to 82°C. For temperatures that are above and below this range, other materials may be required like Stainless steel, Perfluoroelastomer (FFKM) or Ethylenepropylene (EPDM).
The accuracy requirement of the process establishes the acceptable droop (proportional band or offset). Regulators can be categorized into the following groups according to droop:
In most applications, the outlet piping needs to be larger than the regulator for the regulator to reach full capacity. Knowing the pipe size beforehand makes your work easier in selecting regulator.
Typical end connections for indicated regulator sizes are as follows:
The regulator construction materials are determined by the application for instance the process fluid properties and other process requirements. Standard materials are:
Overpressure protection is usually provided by an external relief valve, or in some regulators, by an internal relief valve. Internal relief is an option that you must select at the time of procuring this equipment. The capacity of internal relief is usually limited in comparison with a separate relief valve. Other techniques such as shutoff valves or monitor regulators can also be utilized.
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The required shutoff capability dictates the type of disk material:
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