322-85250000 - Miller Smith 320 Series High Purity SS Regulator, CGA 660, 0-100 PSI

Precision Control for Specialty Gases

The Miller Smith 322-85-25-00-00 is a premium component of the 320 Silverline Series, engineered specifically for the rigorous demands of high-purity and corrosive gas applications. At the core of this device is a commitment to material integrity; the body, filtered seat, and all wetted parts are constructed from 316 Stainless Steel. This metallurgical choice is critical for preventing contamination in the gas stream and ensuring the regulator withstands the aggressive nature of corrosive media over an extended service life. The inclusion of PCTFE seats further enhances chemical resistance, providing a robust sealing solution that maintains performance under high-pressure conditions.

Technically, this regulator excels through its two-stage architecture. Unlike single-stage counterparts that suffer from delivery pressure decay as the cylinder empties, the 322-85-25-00-00 maintains a constant output pressure of 0-100 PSI regardless of inlet pressure fluctuations up to 3500 PSI. This stability is achieved via a convoluted stainless steel diaphragm that offers superior sensitivity and precise control. The diaphragm utilizes a metal-to-metal seal, eliminating the need for elastomeric gaskets that could outgas or degrade, thereby ensuring maximum leak integrity—a non-negotiable feature when handling hazardous gases.

Safety and operational versatility are built into the design. The bonnet features captured vent ports (1/16” FNPT) on both stages, allowing for the safe piping of vented gases away from the work area in the unlikely event of a diaphragm failure. Furthermore, the regulator is designed to withstand internal vacuums, making it compatible with purge cycles essential for removing atmospheric contaminants during cylinder changes. With large 2-1/2 inch single-scale gauges, operators can easily monitor tank and delivery pressures with high accuracy.