321-83250000 - Miller Smith 320 Series High Purity 2-Stage Regulator, CGA 660, 0-50 PSI

Precision Control for Specialty Gases

The Miller Smith 321-83-25-00-00 is a premium component of the 320 Silverline Series, engineered specifically for high-purity and corrosive gas applications. This two-stage regulator is constructed from 316 stainless steel bar stock, ensuring robust resistance to chemical attack and maintaining the integrity of the gas stream. The unit features a convoluted stainless steel diaphragm that offers exceptional sensitivity and precise control over delivery pressure, making it suitable for analytical instrumentation and process control where stability is paramount.

Designed with safety and integrity in mind, the regulator utilizes a metal-to-metal diaphragm seal which provides maximum leak integrity, minimizing the risk of atmospheric contamination or gas escape. The captured vent ports in the bonnet (1/16" FNPT) are a critical safety feature, allowing for the piping of vented gases away from the work area in the event of a diaphragm failure—an essential requirement when handling hazardous or toxic media. The seat assembly includes a 316 stainless steel filter to protect the seating surface from particulate damage, thereby extending the service life of the regulator.

This model is configured with a CGA 660 inlet connection, suitable for specific corrosive gas cylinders, and delivers a stable output range of 0-50 PSIG. The two-stage mechanism compensates for the drop in cylinder pressure, providing a steady outlet pressure without the need for constant manual adjustment. Wetted parts consist of 316 Stainless Steel and PCTFE, ensuring compatibility with a wide range of aggressive gases. Note that for hazardous gas service, a cross purge assembly is recommended to ensure effective purging during cylinder changes.