320-66250000 - Miller Smith 320 Series High Purity Stainless Steel Two-Stage Regulator, 0-25 PSI, CGA 660

High Purity Precision for Corrosive Environments

The Miller Smith 320 Series High Purity Two-Stage Regulator is engineered specifically for the rigorous demands of specialty gas delivery where corrosion resistance and gas purity are paramount. Constructed from 316 stainless steel bar stock, this regulator is designed to handle corrosive and non-corrosive gases while maintaining the integrity of the gas stream. The unit features a 316 stainless steel filtered seat and a PCTFE seat material, ensuring compatibility with aggressive media and extending the service life of the component.

Technically, the 320 Series excels in pressure stability. As a two-stage regulator, it reduces cylinder pressure in two steps, providing a constant delivery pressure of 0-25 PSI regardless of fluctuations in the inlet pressure as the supply cylinder empties. This is critical for analytical instrumentation where pressure drift can compromise results. The convoluted stainless steel diaphragm offers exceptional sensitivity and response, while the metal-to-metal diaphragm seal ensures maximum leak integrity, typically rated for helium leak rates of 1 x 10^-9 cc/sec. The bonnet includes a captured vent port (1/16" FNPT), allowing for the safe piping and venting of hazardous gases in the unlikely event of a diaphragm failure.

This specific model (320-66-25-00-00) comes equipped with a CGA 660 stainless steel inlet connection, suitable for specific corrosive gas mixtures, and features a 1/4" MNPT outlet with a stainless steel needle valve for precise flow control. The regulator is also designed to withstand internal vacuums during purging operations, a necessary procedure when changing cylinders in high-purity applications.