621-40030000 - Miller Smith Silverline 620 Series High Purity 2-Stage Regulator, CGA 326, 0-60 PSI

Precision Control for Specialty Gases

The Miller Smith 621-40-03-00-00 Silverline High Purity Brass Two Stage Regulator is engineered for applications where gas purity and pressure stability are paramount. Part of the renowned 620 Silverline Series, this regulator is designed to handle non-corrosive specialty gases, specifically those requiring a CGA 326 connection (commonly used for Nitrous Oxide). The unit features a robust two-stage reduction mechanism. Unlike single-stage regulators that allow delivery pressure to rise as the cylinder pressure falls (the decaying cylinder effect), this two-stage system maintains a constant, unwavering outlet pressure throughout the entire life of the cylinder. This characteristic makes it an indispensable tool for laboratory environments, gas chromatography, and analytical instrumentation where consistency is critical.

Superior Materials and Construction

Constructed from high-grade nickel-plated brass bar stock, the body of the regulator offers excellent durability and resistance to environmental corrosion while maintaining a pristine flow path. A key feature of the 621-40-03-00-00 is its 316 stainless steel diaphragm. This diaphragm provides a metal-to-metal seal against the body, completely eliminating the need for elastomeric seals that can degrade over time or introduce contaminants through off-gassing. The result is a diffusion-resistant, packless design that preserves the high purity of the gas stream from the cylinder to the application point. Additionally, a 10-micron 316 stainless steel filter is integrated into the seat assembly to trap particulates, further protecting the internal components and ensuring longevity.

Safety and Versatility

Safety is a core component of the Miller Smith design. The regulator includes capturable vents in the bonnet (1/16" FNPT), allowing users to pipe vented gases away to a safe location—a critical feature when working with asphyxiants or hazardous gases in confined spaces. The regulator is rated for a maximum inlet pressure of 3500 PSIG and provides a precise delivery range of 0-60 PSIG. The large 2-1/2 inch single scale gauge ensures that pressure readings are legible and accurate. Whether for research, industrial process control, or calibration, the Miller Smith 621-40-03-00-00 delivers the reliability and purity required for the most demanding tasks.