321-00310000 - Miller Smith 320 Series High Purity Stainless Steel Two-Stage Regulator CGA 705

Technical Overview: Miller Smith 320 Series High Purity Regulator

The Miller Smith 321-00-31-00-00 is a precision-engineered component within the 320 Silverline Series, designed specifically for the regulation of corrosive and non-corrosive specialty gases requiring high purity. 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 CGA 705 inlet connection, typically utilized for ammonia and other compatible corrosive gases, and provides a delivery pressure range of 0-50 PSIG.

Technically, the regulator distinguishes itself with a convoluted stainless steel diaphragm. This design choice significantly improves pressure control precision by reducing hysteresis and enhancing sensitivity to pressure changes. The diaphragm utilizes a metal-to-metal seal, eliminating the need for elastomeric seals that could degrade or outgas, thereby ensuring maximum leak integrity—a critical factor when handling hazardous or high-purity media. The seat assembly incorporates a PCTFE material, chosen for its chemical stability and mechanical strength, further filtered to prevent particulate contamination.

Safety and operational versatility are central to the design. The bonnet includes a captured vent port (1/16" FNPT), allowing for the piping away of hazardous fumes in the unlikely event of a diaphragm failure. Furthermore, the regulator is engineered to withstand internal vacuums, making it suitable for rigorous purging operations essential in high-purity gas management. With a maximum inlet pressure rating of 3500 PSIG and threaded bonnets for panel mounting, this regulator offers a comprehensive solution for analytical instrumentation and process control applications.