0781-1422 - Victor SR 4G-346 High Pressure Air Regulator | 100-1500 PSIG | CGA 346

Victor SR 4G-346 High Pressure Air Regulator Overview

The Victor SR 4G-346 (SKU: 0781-1422) is a premium heavy-duty high-pressure piston regulator designed specifically for demanding industrial applications involving compressed air. Part of the renowned SR 4 series, this regulator is engineered to handle high delivery pressures ranging from 100 to 1500 PSIG, making it an essential tool for specialized tasks such as pressure vessel testing and dead-end testing where precision and safety are paramount.

Robust Construction and Design

Constructed with a machined brass body and housing cap, the SR 4G-346 is built to withstand the rigors of heavy industrial use. Unlike standard diaphragm regulators, this unit utilizes a brass piston-type actuation mechanism. Piston regulators are generally preferred for high-pressure applications because they are less susceptible to damage from pressure spikes and offer greater durability over time. The internal components feature a cartridge-type seat assembly with a PCTFE (Polychlorotrifluoroethylene) seat. PCTFE is chosen for its high compressive strength, low deformation under load, and excellent chemical stability, ensuring a reliable seal even under high-pressure conditions.

Precision and Safety Features

Operational smoothness is achieved through the inclusion of a Delrin cap bushing, which reduces friction and allows for precise pressure adjustments without binding. The regulator is equipped with 2.5-inch brass gauges that provide clear, easy-to-read monitoring of both inlet and delivery pressures. To protect the sensitive internal mechanisms, a sintered bronze inlet filter is integrated to trap particulates and debris from the gas source. Safety is further enhanced by an external adjustable relief valve, providing critical over-pressure protection. The unit connects via a CGA 346 inlet, the standard for high-pressure air up to 3000 PSIG, and features a 1/4" Swagelok outlet with a stainless steel tube fitting for secure downstream connections.

Application Suitability

This regulator is specifically categorized for heavy-duty gas service. Its ability to deliver up to 1500 PSIG makes it unsuitable for standard low-pressure applications but ideal for testing environments. Whether used in manufacturing facilities for leak testing or in field operations for pressure vessel certification, the Victor SR 4G-346 delivers consistent performance and reliability.