35-50-580 - Smith Series 35 Two-Stage Nitrogen/Inert Regulator, 0-50 PSIG, CGA 580

Technical Overview: Smith Series 35 Two-Stage Inert Regulator

The Smith Equipment 35-50-580 is a premium Series 35 two-stage regulator designed specifically for inert gas applications, including Nitrogen, Helium, and Argon. Engineered for environments where precise pressure control is critical, this regulator utilizes a two-stage reduction mechanism. The first stage reduces the high-pressure cylinder gas to an intermediate pressure, while the second stage reduces it to the final working pressure (0-50 PSIG). This configuration isolates the delivery pressure from the decaying inlet pressure of the cylinder, ensuring a flat flow characteristic and eliminating the 'droop' often associated with single-stage regulators as the tank empties.

The unit features a CGA 580 inlet connection, compatible with standard inert gas cylinders, and is rated for a maximum inlet pressure of 3000 PSIG. The body is machined from solid brass, providing thermal stability and durability, while the bonnet is nickel-plated to resist corrosion in harsh industrial environments. Internally, the regulator employs a neoprene composite diaphragm which offers superior sensitivity and flexibility compared to stainless steel diaphragms in this pressure range, allowing for fine-tuned pressure adjustments.

A key technical feature is the proprietary Sure Seat filtered seat technology. This design incorporates a filter directly into the high-pressure seat assembly, preventing microscopic particles and contaminants from entering the seating area. This significantly reduces the risk of seat failure, creep, and costly repairs. Safety is managed via an external relief valve that automatically resets after releasing excessive pressure, protecting the regulator housing and downstream instrumentation from pressure spikes. The 2.0-inch gauges are encased in polished brass and protected by shatter-resistant polycarbonate lenses, ensuring readability and safety.