620-42080000 - Miller Smith 620 Series Silverline High Purity Oxygen Regulator, 2-Stage, CGA 540, 0-25 PSI

Precision Control for Analytical Applications

The Miller Smith 620 Series Silverline High Purity Brass Two-Stage Regulator is engineered specifically for non-corrosive specialty gas applications where maintaining gas stream purity and pressure stability is paramount. Designed for analytical laboratories, chromatography, and EPA protocol standards, this regulator addresses the critical need for contamination-free gas delivery. The core of its performance lies in the stainless steel diaphragm, which provides a non-permeable barrier that preserves the integrity of high-purity oxygen. Unlike standard rubber diaphragms that can off-gas or absorb impurities, the stainless steel construction ensures that the gas composition remains unaltered from the cylinder to the instrument.

This model features a metal-to-metal body-to-diaphragm seal, eliminating the need for O-rings that could introduce contaminants. The regulator is equipped with a filtered seat to further protect the gas stream from particulate matter, utilizing a 316 stainless steel filter for superior durability. With a delivery range of 0-25 PSI (gauge scale 0-30 PSI) and a maximum inlet pressure of 3500 PSI, it offers precise low-pressure control suitable for sensitive equipment. The two-stage design is critical for analytical work, as it compensates for the drop in cylinder pressure over time, delivering a flat, consistent outlet pressure without the need for constant manual adjustment.

Safety and versatility are built into the 620 Series. It includes a capturable vent in the bonnet (1/16" FNPT), allowing for the safe piping away of gases in the unlikely event of a diaphragm failure. The body is machined from brass bar stock and nickel-plated to resist environmental corrosion and maintain a clean aesthetic suitable for laboratory environments. This specific configuration comes with a 1/8" tube stainless steel needle valve, providing fine flow control right at the outlet. Whether used for carrier gases or calibration mixtures, the Miller Smith 620 Series delivers the reliability required for high-stakes analytical data.