Both the Model 121 and Model 122 are highly functional regulators that feature die-cast diaphragm cases and cast iron bodies. This makes them strong and corrosion resistant. Both models incorporate soft-seat valve material, plus a precision-machined “knife edge” orifice for a positive, tight shutoff.

This family of regulators includes models for:
• Standard regulators
• Zero governor or atmospheric regulators
• Differential regulators
• Back pressure regulators (or relief valves)
• Vacuum regulators
• Vacuum breakers

They can be used in a variety of commercial and industrial applications including burners, boilers, furnaces, air heaters and kilns. These regulators also work well for gas engines where fast response improves overall performance.

Benefits to you:
• Allows above-ground or vault installation
• Provides for pilot-operated, pressure-loaded and V-port options
• Serves high-capacity installations
• Allows high inlet pressures

Model 121 Regulators

These regulators may be used for commercial and industrial applications, such as: burners, boilers, furnaces, air heaters, kilns, and gas engines. These offer the versatility to be utilized as both large capacity supply regulators on commercial and industrial service lines, or as a small district regulator.

They offer excellent performance as either a primary control or for monitoring — use it for either or both.

Model 121 Regulators can be used with natural gas, propane, LPG, air nitrogen, etc. Special materials are available for certain corrosive gases.

Model 122 Industrial Combustion Regulators

For an unbeatable combination of capacity, performance, and economy.

Streamlined body passages provide large capacity. Carefully engineered internal sensing produces accurate pressure control without an external control line. And, just in case a particular application necessitates one, a handy tap on the 122 makes connection into an external control line a simple matter.

The 122 is manufactured in 1-inch through 2 ½-inch pipe sizes only.

Downloads:
USG Model 121 Field Regulator Installation Instructions
USG Model 121 Field Regulator Brochure

USG Model 122 Field Regulator Installation Instructions
USG Model 122 Field Regulator Brochure