320-85220000 - Miller Smith 320 Series High Purity Stainless Steel Two-Stage Regulator, 0-25 PSI, CGA 330

Uncompromised Purity and Precision

The Miller Smith 320 Series High Purity Two-Stage Regulator represents the pinnacle of gas control technology for laboratory and industrial environments requiring absolute precision. Model 320-85-22-00-00 is meticulously crafted to handle both corrosive and non-corrosive gases, making it a versatile asset for facilities utilizing specialty gases. The core of its construction is 316 stainless steel bar stock, used for the body and all wetted parts. This material selection is critical; unlike brass or standard steels, 316 stainless steel offers superior resistance to chemical attack, preventing the leaching of contaminants into the gas stream and ensuring the structural integrity of the regulator over years of service.

Gas purity is further safeguarded by a 316 stainless steel filtered seat. This component plays a dual role: it traps microscopic particulates that could damage the seat or disrupt flow, and it maintains the cleanliness of the gas as it moves from the high-pressure cylinder to the low-pressure application. The regulator utilizes a convoluted stainless steel diaphragm, engineered for high sensitivity. This design allows for extremely fine adjustments to the delivery pressure, ensuring that the output matches the exact requirements of sensitive analytical instruments or chemical processes. The metal-to-metal diaphragm seal eliminates the need for elastomeric seals that can degrade or outgas, providing maximum leak integrity—a non-negotiable feature when handling toxic or pyrophoric gases.

One of the defining characteristics of this model is its two-stage reduction mechanism. In a single-stage regulator, the outlet pressure can drift as the inlet pressure from the cylinder drops—a phenomenon known as the decaying inlet characteristic. The 320 Series eliminates this issue by reducing the pressure in two steps, providing a constant delivery pressure of 0-25 PSI regardless of the cylinder's status. This stability allows researchers and technicians to focus on their work without constantly monitoring and adjusting gas settings.

Safety and integration are also key aspects of the 320 Series design. The bonnet features a captured vent port with a 1/16” FNPT connection. This allows safety officers to pipe any potential venting away from the workspace to a safe discharge area, a critical safety protocol for hazardous gas systems. Additionally, the regulator is designed to withstand internal vacuums, facilitating effective purging operations during cylinder changes. The unit comes equipped with a CGA 330 connection, specifically designated for certain corrosive gases, and large 2-1/2 inch gauges for clear visibility. Whether for chromatography, emissions monitoring, or chemical synthesis, this Miller Smith regulator delivers the reliability and performance required for high-stakes applications.