621-20090000 - Miller Smith 620 Silverline High Purity 2-Stage Regulator CGA 580

Technical Overview of the Miller Smith 620 Silverline Regulator

The Miller Smith 621-20-09-00-00 is a premium component within the 620 Silverline Series, engineered specifically for non-corrosive specialty gas applications requiring high purity and precise pressure control. This two-stage regulator is designed to provide a constant delivery pressure ranging from 0 to 60 PSIG, regardless of fluctuations in the inlet pressure, making it an essential tool for analytical laboratories and high-precision industrial processes. The unit is rated for a maximum inlet pressure of 3500 PSIG and connects via a CGA 580 fitting, suitable for inert gases such as Nitrogen, Argon, and Helium.

Construction quality is paramount in the 620 Silverline series. The body is machined from nickel-plated brass bar stock, offering a robust housing that resists environmental corrosion while maintaining a high level of cleanliness. A key feature of this model is its stainless steel diaphragm, which provides superior sensitivity and accuracy compared to elastomeric alternatives. The diaphragm utilizes a metal-to-metal seal with the body, eliminating the need for gaskets that could outgas or degrade over time, thereby preserving the purity of the gas stream. Additionally, the regulator includes a 316 stainless steel filter at the inlet to prevent particulate contamination from entering the seat assembly.

Safety and versatility are also addressed in the design. The bonnet features a capturable vent (1/16" FNPT) on both stages, allowing for the safe piping of vented gases in the event of a diaphragm failure—a critical feature when working in enclosed environments. The regulator is also designed to withstand internal vacuums, making it compatible with purging operations essential for maintaining system purity. A 1/4" MNPT needle valve is included on the outlet for precise flow control.