Regulator Sizing Tools  /  Model 121 / 122

Model 121/122 Sizing Tool

Enter your specifications to determine the best Model 121/122 regulator for your application. It returns the regulator configuration, part number, downloadable summary and sizing tables.

Model 121 and 122 regulators may be used for commercial and industrial applications, such as burners, boilers, furnaces, air heaters, kilns, and gas engines. Model 121 regulators require a sense line while Model 122 regulators can be internally or externally controlled.

Note: This program covers both models together. Model 122 is only offered up to a 2 psi set point, or 1 psi when a monitor is required — above that the tool returns Model 121 options.

Note: The V-Port allows for increased turndown and helps reduce outlet pressure pulsation.

Not sure this is the right model? The General Sizing Tool compares every USG regulator and recommends one for your conditions.

📋 Inputs

Pressures & Flow