121-0002 - Miller Smith Silverline 2-Stage CO2 Regulator 0-60 PSI CGA 320

Technical Overview of the Miller Smith 121-00-02

The Miller Smith 121-00-02 is a premium component of the Silverline 120 Series, engineered specifically for general purpose applications requiring precise control of inert and non-corrosive gases. This specific model is outfitted with a CGA 320 inlet connection, designating it for use with Carbon Dioxide (CO2) cylinders. As a two-stage regulator, it reduces cylinder pressure in two steps, ensuring that the delivery pressure remains constant even as the cylinder pressure decays during use. This feature is essential for applications where pressure stability is critical to the process integrity.

Constructed from rugged brass bar stock, the body and bonnet are plated to provide superior protection against environmental corrosion and wear. The internal mechanism features a large 1-7/8 inch diaphragm which affords high sensitivity and precise control over the 0-60 PSIG delivery range. The regulator is rated for a maximum inlet pressure of 3500 PSIG. A key technical advantage of this unit is the proprietary Sure-Seat technology. This filtered seat design prevents particulate contamination from entering the high-pressure seat area, a common cause of regulator failure, thereby extending the service life and maintaining gas stream purity.

The unit is equipped with two large 2-1/2 inch single scale gauges that provide clear readings of both cylinder and delivery pressure. The body is also tapped for rear panel mounting, offering versatility for installation in gas manifolds or fixed laboratory setups. It is not recommended for applications requiring ultra-high purity where inboard diffusion or elastomeric outgassing is a concern, but it excels in standard industrial and laboratory environments.