# Gas Regulators

FluidFlow allows users to add gas regulators to the database for specific modelling applications. Note, you only need to add a component to the database once. It will then be stored for all future projects. To access this database, select the Database | Gas Regulators menu item:
Actions
Add | Add a new regulator to the database.
Delete | Delete the currently selected regulator record from the database. Note: There are certain records, added by Flite, that you will not be able to delete.
Clone | Makes a copy of the currently selected regulator record and adds it to the database. For example: cloning 'FC EZR 2 60%' will result in a new record 'FC EZR 2 60% (2)'. Note: This action is only available via the context menu when you right-mouse click on the current record.
Load | Loads a ".comp" file - containing a regulator record - and adds it to your current database. See 'Save' below for more information.
Save | Saves the currently selected regulator record as a ".comp" file type. This means that if you have created a new regulator in your local database (stored on your "DATA" Folder), you can save the regulator file and share with another user. The user can then use the "Load" button to select the file and add the new regulator data to their local database.
Gas Regulator Data Entry
Name | A descriptive name for this element.
Manufacturer | The name of the regulator manufacturer.
Materials | The materials used to manufacture the regulator may be defined in this field, e.g., Steel, Stainless Steel, Bronze, etc.
Applications | The specific applications in which the regulator may be used, e.g., Chemical, Power, etc.
Max Operating Pressure | If there is a maximum pressure rating for the regulator you should enter this value here. Leaving the value at 0 means that FluidFlow will not make an overpressure check.
Operating Pressure Unit | The pressure units used when defining the Max Operating Pressure.
Min Pressure Differential | The minimum pressure differential for the regulator should be entered here. If the calculated pressure differential is lower than the min value entered here, FluidFlow will enunciate a warning.
Max Pressure Differential | The maximum pressure differential for the regulator should be entered here. If the calculated pressure differential is higher than the max value entered here, FluidFlow will enunciate a warning.
Differential Pressure Unit | The pressure units used when defining the Min & Max differential Pressure.
Regulator Size | This refers to the diameter of the regulator opening.
Size Unit | This refers to the diameter/size units used in the above entry.
Regulator Equation | There are two options to choose from: ▪ISA Standardized ▪Universal Traditional
Cv (gpm/psi) | The Cv value as provided by the regulator manufacturer.
Xt Pressure Drop Ratio Factor | The pressure drop ratio (choked flow ratio) for gases (Xt) is used to predict the choking point where additional pressure drop (produced by lowering the downstream pressure) will not produce additional flow due to the sonic velocity limitation across the vena contracta (choked flow). This factor is a function of the regulator geometry and varies depending on the regulator type. The value of Xt is determined experimentally and supplied by the valve manufacturer. Note: This is visible only when the selected 'Regulator Equation' is 'ISA Standardized'.
Cg Gas Sizing Coefficient | The value for Cg is provided by the regulator manufacturer. Note: This is visible only when the selected 'Regulator Equation' is 'Universal Traditional'.
If any of the above is unclear or you require any further information, please contact us at: support@fluidflowinfo.com.