221-4005 - Miller Smith Silverline 220 Series Two-Stage Analytical Regulator, CGA 346, 0-50 PSI

Precision Control for Analytical Applications

The Miller Smith 221-40-05 Silverline High Purity Analytical Two-Stage Regulator is engineered to meet the rigorous demands of laboratory and analytical environments. Designed specifically for high purity, non-corrosive pure gases and mixtures, this regulator is an essential component for applications where gas stream integrity and pressure stability are paramount. The Silverline 220 Series distinguishes itself with a robust construction that combines the durability of brass bar stock with the chemical resistance of a fully plated body, bonnet, and gauges. This plating ensures superior protection against environmental factors, maintaining the regulator's aesthetic and functional quality over years of service.

Advanced Two-Stage Design

One of the critical features of the 221-40-05 is its two-stage regulation mechanism. In analytical applications such as gas chromatography—including thermal conductivity, flame ionization, flame photometry, and electron capture—maintaining a constant delivery pressure is crucial for accurate results. Single-stage regulators often suffer from "decay," where the delivery pressure rises as the cylinder pressure falls. The Miller Smith two-stage design eliminates this issue, providing precise control from a full cylinder down to a nearly empty one. This stability ensures that carrier gases and calibration mixtures are delivered at a consistent rate, regardless of fluctuations in the supply cylinder.

Material Integrity and Safety

To preserve the purity of the gas stream, this regulator features a stainless steel diaphragm. Unlike elastomeric diaphragms that can outgas or absorb contaminants, stainless steel provides a non-reactive barrier that ensures the gas exiting the regulator is as pure as the gas entering it. Additionally, a filtered seat is incorporated to trap particulates, further enhancing purity and extending the service life of the seat mechanism. Safety is also a priority, with a built-in capturable preset safety relief valve that protects downstream components from over-pressurization. The regulator is also designed to withstand vacuums generated during purging operations, making it versatile for complex gas management systems.

Key Specifications

• Series: 220 Silverline
• Inlet Connection: CGA 346 (Air/Specialty Gas)
• Delivery Range: 0-50 PSIG
• Max Inlet Pressure: 3500 PSIG
• Gauges: 2-1/2 inch Single Scale