221-4109 - Miller Smith Silverline 220 Series High Purity Two-Stage Regulator, CGA 580

Technical Overview of the Miller Smith 221-41-09

The Miller Smith 221-41-09 is a premium component of the Silverline 220 Series, engineered specifically for high-purity analytical applications. This two-stage regulator is designed to provide a constant delivery pressure ranging from 0 to 60 PSIG, regardless of fluctuations in the supply cylinder pressure. This characteristic is critical for sensitive instrumentation where pressure stability directly impacts data accuracy. The unit features a CGA 580 inlet connection, making it compatible with standard inert gas cylinders such as Nitrogen, Argon, and Helium, and is rated for a maximum inlet pressure of 3500 PSIG.

Construction quality is paramount in the 221-41-09. The body and bonnet are machined from rugged brass bar stock and finished with a high-quality plating. This plating, combined with the internal design, ensures the regulator is suitable for non-corrosive pure gases and mixtures. A key technical feature is the stainless steel diaphragm, which offers superior sensitivity for precise pressure control compared to elastomeric alternatives. Furthermore, the stainless steel material prevents off-gassing and absorption, maintaining the integrity of the gas stream. The seat assembly includes a filter to trap particulates, protecting the seating surface and extending the service life of the device.

Safety and operational utility are addressed through several design elements. The regulator includes a built-in capturable preset safety relief valve that protects downstream components from over-pressurization. The gauges are large, 2-1/2 inch single-scale dials that allow for precise reading of both cylinder and delivery pressures. Additionally, the design is robust enough to withstand vacuums generated during purging operations, a common procedure in high-purity gas handling to eliminate atmospheric contamination before use.