312-00210000 - Miller Smith Silverline 310 SS High Purity Regulator, CGA 326, 0-100 PSIG

Technical Overview of the Miller Smith 310 Series Silverline Regulator

The Miller Smith 312-00-21-00-00 is a premium single-stage regulator from the Silverline 310 Series, engineered specifically for the control of high purity, corrosive, non-corrosive, and toxic gases. This unit is meticulously constructed from 316 stainless steel bar stock, ensuring compatibility with aggressive media that would degrade standard brass components. The regulator features a CGA 326 inlet connection, typically utilized for specific nitrous oxide mixtures or other specialty gas applications requiring stainless steel hardware. With a delivery pressure range of 0-100 PSIG, it provides precise downstream pressure control suitable for analytical instrumentation, process control, and laboratory applications.

Material Composition and Leak Integrity

To maintain the integrity of high-purity gas streams (up to Grade 6.0), the regulator employs a metal-to-metal diaphragm seal. This design eliminates the use of elastomeric seals in the diaphragm assembly, which can be sources of outgassing or permeation. The diaphragm itself is a convoluted stainless steel component, engineered to provide sensitive pressure response and stable regulation despite fluctuations in inlet pressure. All wetted parts—components exposed to the gas stream—are manufactured from 316 PCTFE (Polychlorotrifluoroethylene) or 316 stainless steel. PCTFE is chosen for the seat material due to its excellent chemical resistance and mechanical stability, ensuring a reliable shut-off and extended service life even in corrosive environments.

Safety and Mounting Features

Safety is paramount when handling hazardous gases. The 310 Series bonnet includes a captured vent port (1/16" FNPT), allowing operators to pipe vented gases away to a safe disposal system in the unlikely event of a diaphragm failure. This feature is critical for installations involving toxic or flammable media. The regulator is also designed for versatility in installation; the bonnet is threaded for front panel mounting, and the body includes taps for rear panel mounting, facilitating integration into gas cabinets or control panels. The unit is equipped with large, 2-1/2 inch single-scale gauges that provide clear readings of both inlet and delivery pressures.

Operational Specifications

This model supports a maximum inlet pressure of 3500 PSIG. The outlet connection is a standard 1/4" FNPT, allowing for easy adaptation to various tube fittings or piping systems. It is important to note that for hazardous gas applications, a cross-purge assembly is recommended to ensure effective purging of the system during cylinder changes, preventing atmospheric contamination or operator exposure.