621-00000000 - Miller Smith 620 Series Silverline Two-Stage Regulator 0-60 PSI

Technical Overview: Miller Smith 620 Silverline Series

The Miller Smith 621-00-00-00-00 is a premium component of the 620 Silverline Series, engineered specifically for high-purity gas applications where precision and contamination control are paramount. This two-stage regulator is constructed from nickel-plated brass bar stock, offering a robust solution for non-corrosive gas management. The two-stage architecture is critical for applications requiring unvarying delivery pressure; by reducing pressure in two steps, the regulator effectively negates the supply pressure effect (SPE), maintaining a constant outlet flow even as the supply cylinder or line pressure decays.

Central to its performance is the stainless steel diaphragm, which provides superior sensitivity and longevity compared to elastomeric alternatives. The diaphragm utilizes a metal-to-metal seal with the body, eliminating the potential for off-gassing or contamination associated with O-rings or gaskets in the gas stream. This design feature, combined with a filtered seat and a 316 stainless steel inlet filter, ensures that the gas purity is maintained from inlet to outlet. The unit is rated for a maximum inlet pressure of 3500 PSIG and provides a precise delivery range of 0-60 PSIG.

For safety and versatility in laboratory or industrial setups, the regulator includes capturable vent ports (1/16" FNPT) on the bonnet, allowing for the safe piping of vented gases in the event of a diaphragm breach. The device is also designed to withstand internal vacuums, making it suitable for purge cycles essential in high-purity systems. The 1/4" FNPT inlet and outlet connections offer flexibility for custom plumbing or panel mounting, supported by the threaded front and rear bonnet design.