322-67250000 - Miller Smith 320 Series High Purity Stainless Steel Two-Stage Regulator, CGA 660, 0-100 PSIG

High Purity Pressure Control for Corrosive Environments

The Miller Smith 322-67-25-00-00 is a premium component of the 320 Silverline Series, engineered specifically for the rigorous demands of high purity and corrosive gas regulation. This two-stage regulator is constructed from high-grade 316 stainless steel bar stock, ensuring that all wetted parts—including the body, diaphragm, and filtered seat—offer maximum resistance to chemical attack. The utilization of PCTFE (Polychlorotrifluoroethylene) for the seat material further enhances the unit's chemical compatibility and longevity, making it a critical tool for laboratories, petrochemical facilities, and semiconductor manufacturing where gas purity cannot be compromised.

Technically, the 320 Series distinguishes itself with a convoluted stainless steel diaphragm that provides exceptional sensitivity and precise control over delivery pressure. Unlike elastomeric diaphragms that can permeate gases or degrade over time, the metal-to-metal diaphragm seal employed here ensures superior leak integrity, a non-negotiable requirement when handling hazardous or expensive specialty gases. The two-stage reduction mechanism is pivotal for applications requiring stable outlet pressure; it effectively compensates for the "supply pressure effect" (decaying inlet pressure) as the cylinder empties, maintaining a constant 0-100 PSIG delivery without the need for constant manual adjustment.

Safety and operational versatility are integrated into the design through captured vent ports located in the bonnet (1/16" FNPT). These ports allow operators to pipe vented gases away to a safe discharge area in the unlikely event of a diaphragm failure, a crucial feature for personnel safety when working with toxic or asphyxiating media. Furthermore, the regulator is designed to withstand internal vacuums, facilitating effective purging operations essential for maintaining system purity during cylinder changeovers. The unit comes equipped with large, 2-1/2 inch single-scale gauges for clear readability and features a threaded front and rear bonnet to support panel mounting configurations.