321-00250000 - Miller Smith 320 Series High Purity Two-Stage Stainless Steel Regulator, CGA 660, 0-50 PSI

Precision Control for Corrosive Environments

The Miller Smith 321-00-25-00-00 is a premium high-purity, two-stage regulator designed specifically for the rigorous demands of specialty gas delivery. Part of the renowned 320 Silverline Series, this regulator is engineered to handle both corrosive and non-corrosive gases with unmatched reliability. The core of its construction is 316 stainless steel bar stock, utilized for the body and wetted parts, ensuring high resistance to chemical attack and maintaining the integrity of high-purity gas streams. This material choice is critical for applications involving reactive gases where standard brass regulators would fail or contaminate the process.

Technical excellence is evident in the regulator's seating and diaphragm mechanism. It features a PCTFE seat, which is filtered to prevent particulate contamination—a common cause of regulator creep and failure. The diaphragm is a convoluted stainless steel component that provides a metal-to-metal seal, offering superior leak integrity compared to elastomeric seals. This design allows the regulator to withstand internal vacuums, making it suitable for purge cycles essential in hazardous gas handling. The two-stage architecture is particularly valuable in laboratory and analytical settings, as it provides a constant delivery pressure of 0-50 PSI regardless of fluctuations in the inlet pressure as the supply cylinder empties.

Safety is paramount in the design of the 321-00-25-00-00. The unit includes captured vent ports (1/16" FNPT) in the bonnet, allowing operators to pipe vented gases away to a safe scrubbing or exhaust system in the unlikely event of a diaphragm failure. This feature is indispensable when working with toxic or flammable corrosive gases associated with the CGA 660 connection. With a maximum inlet pressure rating of 3500 PSI and large, easy-to-read 2-1/2 inch gauges, this regulator provides the precision, safety, and durability required for chromatography, EPA protocol gases, and laser gas systems.