320-83250000 - Miller Smith 320 Series High Purity Stainless Steel Two-Stage Regulator, 0-25 PSI, CGA 660

Technical Overview of the Miller Smith 320 Series High Purity Regulator

The Miller Smith 320-83-25-00-00 is a premium high-purity, two-stage regulator engineered specifically for the control of corrosive and non-corrosive gases in analytical, laboratory, and process control environments. Part of the 320 Silverline Series, this unit is manufactured from 316 stainless steel bar stock, ensuring robust resistance to chemical attack and maintaining the integrity of high-purity gas streams. The regulator features a delivery pressure range of 0-25 PSIG, making it suitable for low-pressure applications where precision is paramount.

At the core of the 320 Series is a convoluted stainless steel diaphragm that provides exceptional sensitivity and precise pressure control. Unlike elastomeric diaphragms that can degrade or outgas, the stainless steel diaphragm utilizes a metal-to-metal seal, ensuring maximum leak integrity—a critical requirement when handling hazardous or expensive specialty gases. The wetted parts, composed of 316 Stainless Steel and PCTFE, are selected to minimize particle generation and chemical interaction. A 316 stainless steel filtered seat is incorporated to further protect the seating mechanism from particulate contamination, thereby extending the service life of the regulator and ensuring consistent performance.

Safety and operational flexibility are key design elements. The regulator includes captured vent ports (1/16" FNPT) in the bonnet for both stages, allowing for the safe piping and venting of hazardous gases in the unlikely event of a diaphragm failure. The unit is also designed to withstand internal vacuums, facilitating effective purging operations during cylinder changes. It is equipped with a CGA 660 stainless steel inlet connection and large, 2-1/2 inch single-scale gauges for clear readability. The front and rear bonnets are threaded, offering convenient options for front panel mounting in instrument consoles or gas cabinets.