120-8400 - Miller Smith Silverline 120 Series Two-Stage Inert Gas Regulator, 0-30 PSI

Technical Overview: Miller Smith 120-84-00 Silverline Regulator

The Miller Smith 120-84-00 is a precision-engineered component from the Silverline 120 Series, designed to meet the rigorous demands of general plant, laboratory, and maintenance shop environments. This General Purpose Two-Stage Regulator is specifically calibrated for use with inert and non-corrosive gases, including Air, Nitrogen, Carbon Dioxide (CO2), and Argon. The unit distinguishes itself with a robust construction utilizing brass bar stock for the body, which is subsequently plated—along with the bonnet and gauges—to provide superior protection against environmental corrosion and wear.

Technically, the regulator operates using a two-stage reduction mechanism. This design is critical for applications requiring unvarying delivery pressure; as the high-pressure cylinder depletes, single-stage regulators typically exhibit a 'decay' or rise in outlet pressure, whereas this two-stage model compensates automatically to maintain a set point. The 120-84-00 features a delivery range of 0-30 PSIG, managed by a large 1-7/8 inch diaphragm that ensures sensitivity to minor pressure adjustments. The inlet is rated for a maximum of 3500 PSI and features a 1/4" FNPT connection, making it versatile for custom plumbing or rear panel mounting scenarios.

A key engineering feature is the proprietary Sure-Seat technology. This system incorporates a filtered seat that prevents debris from entering the high-velocity gas stream, thereby maintaining gas purity and significantly extending the service life of the regulator's internal components. The unit is also equipped with a preset safety relief valve that vents to the atmosphere, appropriate for the non-hazardous gases it is designed to handle. Large 2-1/2 inch single-scale gauges provide clear visual confirmation of both inlet and delivery pressures, ensuring operators can monitor system status at a glance.