621-00030000 - Miller Smith 620 Series Silverline Two-Stage Regulator, CGA 326, 0-50 PSI

Precision Control for High Purity Applications

The Miller Smith 621-00-03-00-00 is a distinguished member of the 620 Silverline Series, engineered to meet the rigorous demands of high-purity gas delivery systems. Designed specifically for non-corrosive specialty gases utilizing a CGA 326 connection, this regulator exemplifies precision engineering. At its core lies a stainless steel diaphragm that forms a metal-to-metal seal with the body. This construction eliminates the use of elastomeric seals in the gas stream, thereby preventing outgassing and ensuring that the purity of the gas is maintained from the cylinder to the application point. The diaphragm is designed to provide maximum sensitivity and accuracy, making it an ideal choice for analytical laboratories and process control environments.

One of the defining features of this model is its two-stage regulation architecture. In critical applications, maintaining a stable delivery pressure is paramount. Single-stage regulators often suffer from a phenomenon known as "decay," where the outlet pressure rises as the cylinder pressure falls. The 621-00-03-00-00 eliminates this issue by stepping down the pressure in two stages, ensuring a constant 0-50 PSI delivery pressure regardless of inlet fluctuations up to 3500 PSI. This stability allows operators to set the pressure once and rely on consistent performance throughout the lifespan of the cylinder.

Durability and safety are woven into the design. The body is machined from brass bar stock and finished with nickel plating, offering robust protection against environmental corrosion and wear. To protect the internal mechanism, a 316 stainless steel filter is integrated into the seat, preventing particulate matter from causing damage or leaks. For safety in hazardous environments, the bonnet features capturable 1/16" FNPT vent ports, allowing for the safe piping of vented gases in the unlikely event of a diaphragm failure. Additionally, the unit is capable of withstanding internal vacuums, facilitating effective purging operations without compromising seal integrity. With threaded bonnets for panel mounting, this regulator offers versatile installation options for sophisticated gas management systems.