The following sketch explains how to interpret the flow curves presented in this Catalog.

Maximum Flow - A rating defined as the maximum amount a regulator can flow when the set delivery pressure approaches 0 PSIG (horizontal axis on flow curve). This point on the curve represents a blanketing operation.

Rated Flow - A rating defined as 80% of the maximum flow. This point on the flow curve corresponds to typical operating conditions.

Note: All regulator flow curves in the catalog have been developed using air at 70°F. To obtain flow rates for other gases, multiply flow by the correction factor in Table 1a.

The Cv or the flow coefficient is a number which represents the flow capacity of a regulator for a given set of conditions. The Cv can be used to compare flow capacity between two regulators. The higher the Cv, the greater the flow capacity. The Cv values listed in this catalog represent the overall Cv.