320-70250000 - Miller Smith 320 Series High Purity Stainless Steel Two-Stage Regulator, CGA 660, 0-25 PSI

Precision Control for High Purity Applications

The Miller Smith 320-70-25-00-00 is a premium High Purity Corrosion Resistant Stainless Steel Two-Stage Regulator designed to meet the rigorous demands of specialty gas delivery. Engineered for environments where gas purity and precise control are non-negotiable, this regulator is a staple in laboratories, petrochemical facilities, and industrial settings handling corrosive media. The unit is part of the renowned 320 Silverline Series, known for its robust construction and reliability.

At the core of this regulator is its 316 stainless steel bar stock body and wetted parts, including a 316 stainless steel filtered seat. This material selection is critical for preventing contamination of the gas stream and ensuring the device withstands the aggressive nature of corrosive gases. The seat design not only maintains purity but also significantly extends the service life of the regulator by filtering out particulates that could damage internal components. Furthermore, the regulator utilizes a PCTFE seat material, providing excellent chemical resistance and mechanical properties.

Performance stability is achieved through its two-stage design. Unlike single-stage regulators that may experience a drop in delivery pressure as the supply cylinder empties (decay), the 320 Series maintains a constant delivery pressure regardless of inlet pressure fluctuations. This is essential for analytical instruments and processes requiring a steady flow. The convoluted stainless steel diaphragm offers high sensitivity for precise pressure adjustments, while the metal-to-metal diaphragm seal ensures maximum leak integrity, boasting a design that eliminates elastomeric seals in the diaphragm assembly to prevent outgassing or absorption.

Safety is a priority in the design of the 320-70-25-00-00. It features captured vent ports in the bonnet (1/16" FNPT), allowing users to pipe hazardous or toxic gases away to a safe ventilation system in the rare event of a diaphragm failure. The regulator is also designed to withstand internal vacuums, making it suitable for purging operations necessary when changing cylinders of hazardous gases. Note that a Cross Purge Assembly is recommended for use with this series to ensure effective purging.