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regulator theory, sizing, selection, overpressure protection, noise, freezing, and other topics relating to regulators. This section begins with the basic theory of a regulator and ends with conversion tables and other informative charts. If there’s something you need to know about a regulator that’s not
Use capacity tables or flow charts for determining a direct-operated regulator’s capacity. When sizing direct-operated regulators, use interpolation for application pressures differing from the values in the capacity tables. For best results, use data from within the same spring range.
Valve Sizing Calculations (Traditional Method) Introduction. Fisher® regulators and valves have traditionally been sized using equations derived by the company. There are now standardized calculations that are becoming accepted worldwide.
Find helpful sizing charts, industry terms and definitions, and technology overviews. Article: Properly size control valves | Fisher Oversizing afflicts many plants but is avoidable.
This session covers an overview of sizing and selection of regulators, considerations, details to look out for selecting self-operated and pilot-operated regulators, and resources for more information.
The technical section in our Application Guides provides a rich source of general and specific information to aid you in sizing a particular product.
The expansion of gas at two different orifices in a two-stage system greatly reduces the “refrigeration effect” that causes freezeups. See Fisher Bulletins LP-18 and LP-24 for more detailed information on freezing regulators.
The Industry Standard for Pressure Regulators. A condensed guide to selecting regulators for air, steam, tank blanketing/vapor recovery, liquids, process and fuel gas applications.
All of the Fisher data sheets have charts for capacity and these are what I use to size them, then use the wide open Cv to size the relief (full disclosure: I work for the Fisher local business partner - rep).
For Types 95LD and 95HD regulators, the pressure ranges indicate the differential pressure that can be obtained with the indicated spring. The differential pressure (spring setting) is added to the spring case loading pressure to determine the actual outlet pressure.