321-70210000 - Miller Smith 320 Series High Purity Stainless Steel Regulator CGA 326

High Purity Precision for Corrosive Environments

The Miller Smith 321-70-21-00-00 is a premium component of the 320 Silverline Series, engineered specifically for the rigorous demands of high purity and corrosive gas applications. This two-stage regulator is meticulously constructed from 316 stainless steel bar stock, ensuring that all wetted parts—including the body, diaphragm, and filtered seat—offer maximum resistance to corrosion. This material selection is critical for maintaining the integrity of the gas stream and preventing contamination in sensitive analytical or process environments.

Designed for stability, the two-stage mechanism compensates for the drop in cylinder pressure, delivering a constant outlet pressure of 0-50 PSIG without the need for frequent manual adjustments. The regulator features a unique convoluted stainless steel diaphragm that provides exceptional sensitivity and precise pressure control. A metal-to-metal diaphragm seal further enhances the unit's leak integrity, making it suitable for hazardous gases where safety is paramount. The inclusion of captured vent ports (1/16" FNPT) on the bonnet allows for the safe piping of vented gases away from the work area in the unlikely event of a diaphragm failure.

This model is equipped with a CGA 326 inlet connection and is rated for a maximum inlet pressure of 3500 PSIG. It is also designed to withstand internal vacuums, facilitating effective purging operations during cylinder changes. For optimal safety and performance with hazardous gases, a Cross Purge Assembly is recommended. The large 2-1/2 inch gauges provide clear, single-scale readings, ensuring operators can monitor system status at a glance.