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Fisher® regulators and valves have traditionally been sized using equations derived by the company. There are now standardized calculations that are becoming accepted world wide. Some product literature continues to demonstrate the traditional method, but the trend is to adopt the standardized method.
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.
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
The quick-reacting S200 Series pressure reducing service regulator is typically used in an industrial or commercial installation to minimize the shock effect of sudden downstream load changes that might otherwise
To determine wide-open flow capacity for relief valve sizing of steam, use the equation for critical pressure drops (absolute outlet pressure equal to one-half or less than one-half absolute inlet pressure).
If you have a design flow rate of 100 MSCFH: What size flow coefficient do you need? Good regulation is between 80% to 90% of maximum calculated capacity of regulation. Therefore, divide the required flow rate by 0.8 and divide by the calculated flow rate. Sample Calculation Example: 16
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.
All regulators must have some 'droop' or offset flow, which is an offset to your setpoint. Most regulators are sized for a 10% droop, some for 20% and it depends on what your system can handle. The wide open Cv or Cg is used for safety relief valve sizing only, not for sizing the valve itself.
To determine the maximum flow through a regulator use either: - the seat orifice area formula, or - the nomograph. As long as there is a choked (critical) flow, (P1 = 2 x P2 at least), the flow which you will find on the nomograph is the maximum flow with the valve wide open.
Specifications. Table 1 lists the specifications for the regulators. The following information is stamped on the regulator at the factory: type number, date of manufacture, spring range, and seat ring port size. © Fisher Controls 1981. Figure 1. Typical S301 Series Regulator. INSTALLATION. WARNING.