221-2000 - Miller Smith Silverline 220 Series High Purity Two-Stage Regulator, 0-50 PSI

Precision Control for Analytical Applications

The Miller Smith 221-20-00 Silverline High Purity Analytical Two Stage Regulator is engineered to meet the exacting demands of laboratory and analytical environments. In applications such as gas chromatography—including thermal conductivity, flame ionization, flame photometry, and electron capture—stability and purity are paramount. This regulator addresses these needs with a sophisticated two-stage design that isolates the delivery pressure from fluctuations in the supply cylinder. As a high-pressure cylinder empties, the outlet pressure of a single-stage regulator can drift; however, the 220 Series maintains a steady 0-60 PSIG output (nominal 50 PSI application) from a full cylinder down to nearly empty, ensuring your calibration mixtures and carrier gases remain consistent throughout the process.

Constructed from rugged brass bar stock, the body, bonnet, and gauges are fully plated to provide superior protection against environmental corrosion and wear. The heart of the regulator features a stainless steel diaphragm. Unlike elastomeric diaphragms that can absorb or outgas impurities, stainless steel ensures that the gas stream remains unadulterated, preserving the integrity of high-purity, non-corrosive gases. This material choice also provides a precise response to pressure changes, allowing for fine-tuned control essential for sensitive instrumentation.

Operational safety and longevity are built into the design. The unit includes a built-in capturable preset safety relief valve that protects downstream components from over-pressurization. Additionally, a filtered seat mechanism traps microscopic particles that could otherwise damage the seating surface, thereby extending the service life of the regulator and maintaining a leak-tight seal. The regulator is also designed to withstand vacuums generated during purging operations, a critical feature for maintaining system purity during cylinder changeouts. With large, easy-to-read 2-1/2 inch single scale gauges and a 1/4" FNPT connection configuration, the Miller Smith 221-20-00 is the professional's choice for analytical gas delivery.