121-0008 - Miller Smith Silverline 2-Stage Oxygen Regulator, CGA 540, 0-60 PSI

Technical Overview: Miller Smith Silverline 121-00-08

The Miller Smith 121-00-08 is a premium component within the Silverline 120 Series, engineered specifically for general purpose applications requiring precise and constant delivery pressure. As a two-stage regulator, it functions by reducing the high-pressure cylinder gas to an intermediate pressure in the first stage, and then to the final delivery pressure in the second stage. This mechanical configuration provides a significant technical advantage: the output pressure remains stable and consistent even as the inlet pressure decays during cylinder depletion. This characteristic makes it superior to single-stage counterparts for applications where pressure stability is critical, such as in laboratory settings, calibration stations, or precision maintenance shops.

Constructed from rugged brass bar stock, the body and bonnet are designed to withstand the rigors of industrial environments while maintaining a high degree of accuracy. The unit features a CGA 540 inlet connection, standard for Oxygen service in the United States, and a 1/4-inch Female NPT outlet, allowing for versatile integration into various piping or hose systems. The internal mechanism utilizes Miller's proprietary Sure-Seat technology, which incorporates a filtered seat to prevent debris from entering the high-velocity gas stream, thereby extending the seat life and ensuring gas purity. The large 1-7/8 inch diaphragm enhances sensitivity, allowing for fine-tuned pressure adjustments within the 0-60 PSIG delivery range.

Safety and durability are paramount in the design. The regulator includes a preset safety relief valve that vents to the atmosphere, protecting the downstream equipment from over-pressurization. The entire assembly, including the body, bonnet, and the large 2-1/2 inch gauges, is plated to resist corrosion and wear. The gauges are single-scale and easy to read, providing clear visual indication of both cylinder and delivery pressures. With a maximum inlet pressure rating of 3500 PSIG, this regulator is compatible with standard high-pressure cylinders.