221-4002 - Miller Smith Silverline 2-Stage High Purity Regulator CGA 320 (0-50 PSI)

Precision Analytical Control with Miller Smith Silverline

The Miller Smith 221-40-02 Silverline High Purity Analytical Two Stage Regulator is engineered for the rigorous demands of laboratory and analytical environments. Part of the esteemed 220 Silverline Series, this regulator is specifically designed to manage high purity, non-corrosive gases and mixtures where maintaining gas integrity is paramount. The unit features a CGA 320 inlet connection, making it the standard choice for high-purity Carbon Dioxide (CO2) applications often found in chromatography and other sensitive scientific processes.

At the core of this regulator's performance is its two-stage design. Unlike single-stage counterparts, a two-stage regulator reduces cylinder pressure in two steps, providing a constant delivery pressure regardless of fluctuations in the supply cylinder's pressure. This characteristic is critical in analytical applications where even minor deviations in flow or pressure can compromise test results. The regulator allows for precise control from a full cylinder down to a nearly empty one, ensuring maximum utilization of gas supplies without sacrificing stability.

Material construction is a key differentiator for the 221-40-02. It utilizes a stainless steel diaphragm which offers superior sensitivity for precise pressure control while ensuring that the gas stream remains uncontaminated by the regulator's internal components. The body, bonnet, and gauges are constructed from rugged brass bar stock and are fully plated. This plating not only provides an aesthetic finish but, more importantly, offers superior protection against environmental corrosion and wear. The seat is filtered to trap particulates, further enhancing gas stream purity and significantly extending the service life of the seat assembly.

Safety and usability are also prioritized. The regulator includes a built-in capturable preset safety relief valve that protects downstream components from over-pressurization. The large 2-1/2 inch single scale gauges are easy to read, allowing operators to monitor cylinder and delivery pressure at a glance. Furthermore, 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.