320-69220000 - Miller Smith 320 Series High Purity Stainless Steel Two-Stage Regulator CGA 330

Precision Control for Corrosive and Specialty Gases

The Miller Smith 320 Series High Purity Two-Stage Regulator is engineered specifically for the rigorous demands of specialty gas delivery. When handling corrosive gases or applications requiring ultra-high purity, standard brass regulators simply cannot provide the necessary durability or contamination control. This model (320-69-22-00-00) features a robust 316 stainless steel bar stock body and a 316 stainless steel filtered seat, ensuring that the gas stream remains pure and the regulator resists the damaging effects of corrosive media. The use of PCTFE for wetted parts further enhances its chemical resistance, making it an ideal choice for laboratories and industrial facilities handling hazardous gases.

One of the critical challenges in gas delivery is maintaining a constant outlet pressure as the supply cylinder drains. Single-stage regulators often suffer from "decay," where the delivery pressure rises as the inlet pressure falls. The Miller 320 Series utilizes a sophisticated two-stage design that eliminates this issue, providing a steady 0-25 PSI delivery pressure regardless of inlet fluctuations up to 3500 PSIG. This stability is crucial for analytical instruments and sensitive processes where even minor pressure variances can compromise results.

Safety is paramount when working with the types of gases typically associated with a CGA 330 connection. This regulator is designed with a metal-to-metal diaphragm seal for maximum leak integrity, minimizing the risk of fugitive emissions. Furthermore, the bonnet features captured vent ports (1/16" FNPT), allowing operators to pipe vented gases away to a safe disposal system in the unlikely event of a diaphragm failure. The unit is also capable of withstanding internal vacuums, facilitating effective purging operations during cylinder changes to ensure operator safety and system purity.

Key Features for Gas Professionals:

• Material Integrity: Full 316 stainless steel construction prevents corrosion and contamination.


• Stable Delivery: Two-stage mechanism ensures consistent pressure output throughout the life of the cylinder.


• Safety First: Captured vent ports and metal-to-metal seals protect personnel from hazardous leaks.


• Versatile Mounting: Threaded bonnets allow for secure panel mounting in gas cabinets or instrument benches.