220-4006 - Miller Smith Silverline 220 Series Two-Stage Analytical Regulator CGA 350

Technical Overview: Miller Smith 220-40-06

The Miller Smith 220-40-06 is a premium two-stage regulator engineered for high-purity, non-corrosive gas applications requiring a CGA 350 connection (typically Hydrogen, Methane, or Carbon Monoxide). This unit is part of the renowned Silverline 220 Series, known for its rugged brass bar stock construction and precise pressure management. The two-stage design is essential for applications requiring a constant delivery pressure; it automatically compensates for the drop in cylinder pressure as the gas is consumed, providing a stable 0-15 PSIG output from full to nearly empty cylinders.

Construction and Performance

At the heart of this regulator is a stainless steel diaphragm. This component provides precise control over outlet pressure and eliminates the risk of elastomeric contamination common in standard industrial regulators. The unit is rated for a maximum inlet pressure of 3500 PSIG and features a filtered seat design. This filtration is critical for high-purity applications, as it traps microscopic particles that could otherwise damage the seat or contaminate the process gas. The entire body and bonnet are plated to resist environmental corrosion and maintain a clean condition in laboratory settings.

Vacuum and Safety Features

The 220-40-06 is designed to withstand vacuums generated during purging operations, a common requirement in analytical setups to ensure lines are clear of atmospheric air before introducing process gas. It features an automatic reseating safety relief valve that protects regulator components and downstream instrumentation from over-pressurization. The relief valve is capturable, allowing for safe venting of hazardous gases if necessary. The regulator is equipped with large 2-1/2 inch gauges that provide clear readings of both inlet and outlet pressures.

Key Specifications

• Connection: CGA 350
• Max Inlet: 3500 PSIG
• Delivery Range: 0-15 PSIG
• Stage Type: Two-Stage
• Diaphragm: Stainless Steel

This regulator is ideally suited for the control of carrier gases or calibration mixtures used in gas chromatography, including thermal conductivity, flame ionization, flame photometry, and electron capture applications.