620-03100000 - Miller Smith 620 Series Silverline High Purity 2-Stage Regulator, CGA 590, 0-25 PSI

Precision Control for High Purity Applications

The Miller Smith 620-03-10-00-00 Silverline High Purity Brass Two Stage Regulator is engineered to meet the rigorous demands of analytical instrumentation and specialty gas delivery systems. Designed for non-corrosive gases, this regulator exemplifies precision engineering with its two-stage architecture. Unlike single-stage regulators that suffer from delivery pressure decay (or rise) as the supply cylinder empties, the 620 Series maintains a constant outlet pressure of 0-25 PSI regardless of inlet pressure fluctuations up to 3500 PSI. This stability is critical for chromatography, emission analysis, and other laboratory applications where flow consistency is paramount.

Material Integrity and Cleanliness

Gas purity is maintained through the use of premium materials. The body is machined from brass bar stock and finished with nickel plating, offering a robust exterior that resists environmental corrosion while maintaining a clean internal flow path. Central to its high-purity designation is the stainless steel diaphragm. Unlike elastomeric diaphragms that can absorb and release contaminants (outgassing) or allow permeation of atmospheric gases, the stainless steel diaphragm provides a hermetic barrier. This is complemented by a metal-to-metal body-to-diaphragm seal, eliminating the need for O-rings in the diaphragm assembly and ensuring superior leak integrity.

Advanced Design Features

The regulator includes a filtered seat to further enhance gas stream purity, protecting the internal mechanism from microscopic particulates that could compromise performance. A 316 stainless steel filter is integrated into the inlet to trap debris before it enters the high-pressure stage. For safety and versatility, the bonnet features a capturable vent (1/16" FNPT), allowing users to pipe vented gases away from the work area if necessary—a crucial feature when working in confined spaces or with specific safety protocols. The unit is also designed to withstand internal vacuums, making it suitable for purging operations without damaging the diaphragm or internal seals.

Application Suitability

With a CGA 590 connection, this regulator is specifically configured for Industrial Air and compatible specialty gases. The 2-1/2 inch single scale gauge provides clear, easy-to-read pressure monitoring. Whether integrated into a laboratory bench or used in a high-tech manufacturing process, the Miller Smith 620 Series delivers the reliability and purity required for sensitive operations.