121-2008 - Miller Smith Silverline 120 Series 2-Stage Regulator, CGA 540, 0-50 PSI

Technical Specification and Construction

The Miller Smith 121-20-08 is a premium component of the Silverline 120 Series, engineered for general purpose applications requiring precise control of inert and non-corrosive gases. This two-stage regulator is designed to maintain a constant delivery pressure ranging from 0 to 50 PSIG, regardless of fluctuations in the cylinder supply pressure. This characteristic makes it superior to single-stage alternatives for laboratory, testing, and calibration environments where pressure stability is critical.

Constructed from rugged brass bar stock, the body and bonnet are plated to provide superior protection against environmental corrosion and wear. The internal mechanism features a large 1-7/8 inch diaphragm, which enhances sensitivity and control accuracy. A key technical advantage is the inclusion of Sure-Seat technology, which utilizes a filtered seat to prevent debris from entering the high-pressure seating area, thereby extending the service life of the regulator and maintaining gas stream purity.

The unit is equipped with a CGA 540 inlet connection, typically associated with Oxygen service, but specified here for general purpose use with compatible inert gases as per the manufacturer's series designation. It features a 1/4" MNPT outlet connection (indicated by the SKU nomenclature) and is rated for a maximum inlet pressure of 3,500 PSIG. The regulator includes two 2-1/2 inch single-scale gauges for easy monitoring of inlet and delivery pressures. For integration into fixed systems, the body is tapped to facilitate rear panel mounting.