622-40000000 - Miller Smith 620 Silverline 2-Stage High Purity Regulator 0-100 PSI 1/4 FNPT

Miller Smith 622-40-00-00-00 Silverline High Purity Brass Two Stage Regulator

The Miller Smith 622-40-00-00-00 is a premium component of the 620 Silverline Series, engineered specifically for the precise management of non-corrosive specialty gases. In analytical and laboratory environments where gas purity is paramount, this regulator stands out with its high-integrity construction. The core of its performance lies in the stainless steel diaphragm, which provides a non-contaminating surface for the gas stream. Unlike standard rubber diaphragms that can off-gas or degrade, the stainless steel interface ensures that the high purity of your source gas is maintained all the way to your instrument or process.

This unit features a two-stage design, a critical attribute for applications requiring unwavering pressure stability. As a gas cylinder empties, the inlet pressure drops significantly. In single-stage regulators, this drop can cause the outlet pressure to rise (a phenomenon known as the decaying inlet characteristic). The 622-40-00-00-00 eliminates this issue by stepping the pressure down in two stages, delivering a constant 0-100 PSI outlet pressure regardless of fluctuations in the supply cylinder. This stability is essential for gas chromatography, mass spectrometry, and other sensitive analytical techniques.

Constructed from nickel-plated brass bar stock, the body is both durable and resistant to environmental corrosion. The regulator utilizes a metal-to-metal seal between the body and the diaphragm, further eliminating the need for soft seals that could introduce impurities. For safety and versatility, the bonnet includes a capturable vent (1/16" FNPT), allowing users to pipe vented gases away safely if the diaphragm were to fail—a necessary feature when handling hazardous or asphyxiating gases. With 1/4" FNPT inlet and outlet connections, this regulator is ready for panel mounting or integration into custom gas delivery manifolds.

Key Features:

• High Purity Construction: Filtered seat and stainless steel diaphragm prevent contamination.


• Stable Delivery: Two-stage mechanism provides constant outlet pressure up to 100 PSI.


• Versatile Connections: 1/4" FNPT ports allow for flexible installation in lines or panels.


• Safety First: Capturable bonnet vent allows for the safe diversion of vented gases.