0781-1445 - Victor SR4J-540 High Pressure Oxygen Piston Regulator, 3000 PSIG Delivery

Victor SR 4J-540 High Pressure Oxygen Regulator Overview

The Victor SR 4J-540 (0781-1445) is a premium heavy-duty high-pressure piston regulator designed to meet the rigorous demands of industrial testing and high-pressure gas delivery. Engineered by Victor, a leader in gas control equipment, this regulator is part of the SR 4 Series, specifically tailored for applications requiring substantial delivery pressures ranging from 200 to 3000 PSIG. Unlike standard regulators that utilize a diaphragm, the SR 4J-540 employs a brass piston actuation mechanism. This design choice is critical for high-pressure environments, as pistons offer superior durability and resistance to the wear and tear associated with high-pressure spikes and dead-end testing scenarios.

Constructed with a machined brass body and housing cap, the SR 4J-540 is built to withstand harsh industrial environments. The internal components are equally robust, featuring a cartridge-type seat assembly with a PCTFE seat. This material selection ensures a reliable seal and long service life, even under the stress of 3000 PSIG inlet pressures. The regulator also incorporates a Delrin cap bushing, which facilitates smooth and precise adjustments, allowing operators to dial in the exact pressure required for sensitive pressure vessel testing without the stick-slip phenomenon often found in lesser regulators.

Safety and longevity are further enhanced by the inclusion of a sintered bronze inlet filter. This filter prevents particulate matter and debris from entering the regulator, protecting the seat and piston from damage that could lead to leaks or failure. The unit comes equipped with large, easy-to-read 2.5-inch brass gauges that provide clear visual confirmation of both cylinder and delivery pressures. The inlet connection is a standard CGA 540 for oxygen service, while the outlet is fitted with a 1/4-inch Swagelok connection (1/4" stainless tube fitting), ensuring a secure, leak-free interface with testing equipment.

This regulator is specifically recommended for pressure vessel testing and dead-end testing where high delivery pressures are mandatory. Its robust design and high delivery range make it an indispensable tool for maintenance, repair, and operations (MRO) professionals dealing with high-pressure oxygen systems. Whether used in a laboratory setting or a heavy industrial fabrication shop, the Victor SR 4J-540 delivers the performance, safety, and reliability that professionals trust.