121-2000 - Miller Smith Silverline 2-Stage General Purpose Regulator 0-50 PSI 1/4" FNPT

Precision Control for Inert Gas Applications

The Miller Smith 121-20-00 Silverline Series General Purpose Two Stage Regulator is a premium solution designed for laboratories, industrial plants, and maintenance facilities requiring exacting control over inert and non-corrosive gases. Engineered by Miller Electric, a leader in industrial gas equipment, this regulator belongs to the esteemed Silverline 120 Series, known for combining durability with precision performance. The unit is specifically calibrated for a delivery range of 0-50 PSIG, making it ideal for applications where low-to-medium pressure stability is critical.

Unlike single-stage regulators that allow delivery pressure to rise as the supply cylinder empties (a phenomenon known as the decaying cylinder effect), this two-stage regulator reduces pressure in two steps. This mechanical advantage ensures that the output pressure remains constant throughout the life of the cylinder, providing reliable flow for sensitive instrumentation, testing equipment, or shielding gas lines. The regulator features a 1/4" FNPT inlet connection, making it versatile for panel mounting or hard-piped manifold systems rather than direct cylinder attachment.

Robust Construction and Purity

Durability is at the core of the 121-20-00's design. It is machined from rugged brass bar stock and finished with a plated body and bonnet, offering superior protection against corrosion and wear in shop environments. Inside, Miller's proprietary Sure-Seat technology utilizes a filtered seat to prevent debris from entering the high-pressure stream, significantly extending the service life of the component and maintaining gas purity. The large 1-7/8 inch diaphragm allows for highly responsive pressure adjustments, while the 2-1/2 inch single-scale gauges provide clear, easy-to-read metrics for operators.

This regulator is suitable for use with Air, Nitrogen, Carbon Dioxide (CO2), and Argon. It includes a preset safety relief valve that vents to the atmosphere, ensuring safe operation with non-hazardous gases. Whether you are outfitting a research lab or a general maintenance shop, the Miller Smith 121-20-00 delivers the consistency and reliability professionals demand.