121-8208 - Miller Smith Silverline 2-Stage Oxygen Regulator, CGA 540, 0-60 PSI

Technical Overview of the Miller Smith 121-82-08

The Miller Smith 121-82-08 is a premium component of the Silverline 120 Series, engineered specifically for general purpose oxygen regulation in industrial and laboratory environments. As a two-stage regulator, it is designed to reduce cylinder pressure in two distinct steps, ensuring that the delivery pressure remains constant even as the inlet pressure decays from a full cylinder. This mechanical advantage makes it superior to single-stage counterparts for applications requiring steady flow over long durations without manual adjustment.

Constructed from rugged brass bar stock, the body offers exceptional durability and resistance to deformation under high pressure. The bonnet and gauges are nickel-plated, providing an additional layer of protection against corrosion and wear in shop environments. The internal mechanism features a large 1-7/8 inch diaphragm which enhances sensitivity, allowing for precise control of delivery pressure within the 0-60 PSIG range. The unit is rated for a maximum inlet pressure of 3500 PSIG, accommodating standard high-pressure oxygen cylinders via the CGA 540 connection.

A critical feature of this regulator is the proprietary Sure-Seat technology. This filtered seat design prevents debris and particulate matter from entering the high-pressure seat area, a common cause of regulator failure and creep. By filtering the gas stream, the regulator maintains purity and extends its operational service life. The assembly also includes a preset safety relief valve that vents to the atmosphere, adding a layer of safety for non-hazardous gas applications. The body is tapped for rear panel mounting, offering flexibility for fixed installations in gas distribution panels or bench setups.