221-4000 - Miller Smith Silverline 220 Series High Purity Two-Stage Regulator 0-50 PSI

Precision Control for Analytical Applications

The Miller Smith 221-40-00 Silverline High Purity Analytical Two Stage Regulator is engineered to meet the rigorous demands of laboratory and analytical environments. Designed specifically for non-corrosive, high-purity gases, this regulator ensures that the integrity of your gas stream is maintained from the cylinder to the instrument. It is part of the renowned 220 Silverline Series, which is synonymous with reliability and precision in the specialty gas industry.

Advanced Two-Stage Design

In analytical applications such as gas chromatography, stability is paramount. The 221-40-00 utilizes a true two-stage reduction mechanism. The first stage reduces the high-pressure cylinder gas to an intermediate pressure, while the second stage reduces it to the final delivery pressure (0-50 PSIG). This configuration eliminates the "decay" or "rise" in delivery pressure often seen in single-stage regulators as the supply cylinder empties. The result is a constant, unwavering flow of carrier gas or calibration mixture, ensuring the accuracy of your thermal conductivity, flame ionization, or electron capture detectors.

Material Integrity and Purity

Contamination is the enemy of high-purity applications. This regulator features a stainless steel diaphragm, which provides a non-permeable barrier that prevents atmospheric contamination and ensures precise pressure response. Unlike elastomeric diaphragms, stainless steel does not absorb or release gases. Additionally, the regulator includes a filtered seat that traps particulates, further protecting the gas stream purity and extending the service life of the internal components. The body, bonnet, and gauges are fully plated to resist corrosion and maintain a clean, professional appearance in laboratory settings.

Versatile Connectivity

Equipped with 1/4" FNPT inlet and outlet connections, the 221-40-00 offers flexibility for various installation requirements. Whether integrating into a custom manifold system or connecting directly to instrument lines, the standard NPT threading allows for secure, leak-free connections. The unit also features a built-in capturable preset safety relief valve, adding a layer of safety by venting over-pressure away from the user and sensitive equipment.