313-00210000 - Miller Smith Silverline 313 Series Stainless Steel Regulator, 0-250 PSIG, CGA 326

Technical Overview of the Miller Smith 313 Series Silverline Regulator

The Miller Smith 313-00-21-00-00 is a premium component within the Silverline 310 Series, engineered specifically for high-purity gas delivery applications where contamination control and corrosion resistance are paramount. This single-stage regulator is precision-machined from 316 stainless steel bar stock, ensuring compatibility with a wide spectrum of corrosive, non-corrosive, and toxic gases. The unit is designed to accept an inlet pressure of up to 3500 PSIG and provides a stable delivery pressure range of 0-250 PSIG, making it suitable for analytical instrumentation, process control, and laboratory environments.

At the core of the 313 Series is a convoluted stainless steel diaphragm. Unlike elastomeric diaphragms that can outgas or degrade over time, this stainless steel diaphragm provides a non-contaminating pressure boundary. It utilizes a metal-to-metal seal against the body, ensuring maximum leak integrity—a critical specification when handling hazardous or high-cost specialty gases. The regulator also features a 316 stainless steel filtered seat utilizing PCTFE material. This combination offers excellent chemical resistance and mechanical stability, significantly extending the service life of the regulator by preventing particulate damage to the seating surface.

Safety and integration are key aspects of the design. The bonnet includes a captured vent port (1/16" FNPT), which allows operators to pipe vented gases away to a safe disposal system in the event of a diaphragm failure, a mandatory feature for toxic gas service. The regulator is equipped with large, easy-to-read 2-1/2" single scale gauges that provide clear visual indication of cylinder and delivery pressures. For system integration, the bonnet is threaded for front panel mounting, and the body is tapped for rear panel mounting, offering versatile installation options in gas cabinets or benchtop setups. The inlet connection is a CGA 326, typically associated with specific corrosive or oxidizer gas services (such as Nitrous Oxide in certain purity grades), and the outlet is a standard 1/4" FNPT.