322-00250000 - Miller Smith 320 Series High Purity Stainless Steel Two-Stage Regulator, 0-100 PSI, CGA 660

Technical Overview: Miller Smith 320 Series High Purity Regulator

The Miller Smith 322-00-25-00-00 is a premium component within the 320 Silverline Series, engineered specifically for the rigorous demands of high-purity and corrosive gas applications. This two-stage regulator is constructed from 316 stainless steel bar stock, ensuring exceptional resistance to chemical attack and maintaining the integrity of the gas stream. The unit is configured with a CGA 660 connection, suitable for specific corrosive gas cylinders, and delivers a precise outlet pressure range of 0-100 PSI.

At the core of this regulator's performance is its convoluted stainless steel diaphragm. Unlike elastomeric diaphragms that can permeate gases or degrade over time, the stainless steel construction provides a non-contaminating metal-to-metal seal. This design feature is critical for applications requiring high leak integrity, effectively preventing atmospheric contamination and the escape of hazardous process gases. The diaphragm's convoluted shape enhances sensitivity, allowing for fine pressure adjustments and stable flow characteristics even at low delivery pressures.

The two-stage architecture of the 322-00-25-00-00 provides a distinct advantage in process stability. By reducing cylinder pressure in two steps, the regulator eliminates the "decay" or "supply pressure effect" common in single-stage units, where delivery pressure rises as the cylinder empties. This ensures a constant delivery pressure throughout the life of the cylinder, which is vital for analytical instrumentation and critical process control. Furthermore, the regulator features PCTFE seats and a 316 stainless steel filtered seat assembly, designed to withstand the abrasive nature of high-velocity gas streams and extend the service life of the unit.

Safety and integration are also key design elements. The bonnet includes captured vent ports (1/16" FNPT) on both stages, allowing for the piping of vented gases to a safe disposal system—a mandatory requirement when handling toxic or flammable corrosive gases. The regulator is also designed to withstand internal vacuums, making it compatible with purge cycles essential for changing cylinders in hazardous gas service.