0781-1450 - Victor SR4J-680 High Pressure Inert Gas Piston Regulator, 3000 PSIG Delivery

Technical Overview of the Victor SR4J-680 High Pressure Regulator

The Victor SR4J-680 (SKU: 0781-1450) is a premium industrial-grade regulator designed specifically for high-pressure inert gas applications. Part of the renowned SR 4 Heavy Duty series, this unit is engineered to handle the rigorous demands of pressure vessel testing and dead-end testing where precision and safety are paramount. Unlike standard diaphragm regulators, the SR4J utilizes a robust piston-type actuation mechanism constructed from brass. This design choice is critical for managing high delivery pressures ranging from 200 to 3000 PSIG without the risk of diaphragm rupture or fatigue.

The regulator's body and housing cap are machined from solid brass, providing exceptional structural integrity and resistance to deformation under high loads. The internal architecture features a cartridge-type seat assembly equipped with a PCTFE (Polychlorotrifluoroethylene) seat. PCTFE is selected for its high compressive strength, low deformation under load, and excellent chemical resistance, making it the ideal material for sealing against inlet pressures that can reach up to 5500 PSIG. To ensure the longevity of the seat and internal components, a sintered bronze inlet filter is integrated to trap particulates and debris from the gas stream.

Operational precision is enhanced by a Delrin cap bushing, which reduces friction during adjustment, allowing for smooth and accurate setting of delivery pressure. The unit comes equipped with a CGA 680 inlet connection, standard for high-pressure inert gas cylinders, and features a 1/4-inch Swagelok outlet connection with a 1/4-inch stainless tube fitting, facilitating secure and leak-free integration into testing setups. Dual 2.5-inch brass gauges provide clear visual confirmation of both cylinder and delivery pressures. The SR4J-680 represents the pinnacle of Victor's high-pressure gas control technology, offering reliability for critical industrial testing environments.