320-70310000 - Miller Smith 320 Series Stainless Steel Two-Stage Regulator, CGA 705, 0-25 PSI

Technical Precision for High Purity Applications

The Miller Smith 320-70-31-00-00 is a premium high-purity, two-stage regulator designed specifically for the rigorous demands of analytical and process applications involving corrosive and non-corrosive gases. Part of the 320 Silverline Series, this regulator is engineered to provide stable, ripple-free delivery pressure, making it an essential component for laboratory instrumentation, calibration gases, and process control systems where purity and precision are paramount.

At the core of this regulator is its 316 Stainless Steel bar stock body and PCTFE (Polychlorotrifluoroethylene) seats. This material combination offers exceptional resistance to corrosion, ensuring compatibility with a wide range of specialty gases. The unit features a convoluted stainless steel diaphragm that provides superior sensitivity and control accuracy. Unlike elastomeric diaphragms, the stainless steel diaphragm minimizes diffusion and outgassing, preserving the integrity of high-purity gas streams. The metal-to-metal diaphragm seal further enhances this integrity, boasting a leak rate of less than 1 x 10^-9 cc/sec, which is critical for handling hazardous or expensive gases.

The two-stage architecture of the 320 Series is designed to compensate for inlet pressure decay. As the gas cylinder empties and inlet pressure drops, single-stage regulators typically experience a rise in delivery pressure. The 320 Series eliminates this "decaying inlet characteristic," maintaining a constant output pressure of 0-25 PSI without requiring manual adjustment. This stability is vital for long-duration processes.

Safety is engineered into every aspect of the design. The regulator includes captured vent ports (1/16" FNPT) on the bonnet, allowing users to pipe hazardous or toxic gases away to a safe scrubbing or venting system in the unlikely event of a diaphragm failure. Additionally, the regulator is designed to withstand internal vacuums, facilitating effective purging operations during cylinder changes. Large 2-1/2 inch gauges provide clear visibility of both cylinder and delivery pressures, ensuring operators can monitor system status at a glance.