0781-2341 - Victor SR350 Heavy Duty Single Stage Oxygen Regulator, CGA-540

Industrial-Grade Precision and Durability

The Victor SR 350D-540 (SKU: 0781-2341) is a single-stage heavy/medium duty oxygen regulator engineered for professionals who demand reliability in industrial environments. Designed to manage high-capacity gas flows, this regulator features a robust die-forged brass body and spring housing cap, ensuring exceptional resistance to mechanical stress and workplace wear. The unit is specifically calibrated for oxygen service with a CGA-540 inlet connection and provides a delivery pressure range of 5 to 125 PSIG, making it versatile for a wide array of cutting, heating, and welding applications.

Technically, the SR 350 series distinguishes itself with a stem-type seat mechanism that enhances sealing integrity and longevity. The regulator utilizes a 2.75-inch fabric-reinforced neoprene diaphragm (in specific configurations) or stainless steel elements to maintain accurate pressure delivery even as cylinder pressure decays. With a flow coefficient (Cv) of 0.238, it ensures adequate flow rates for demanding tasks. The internal design includes a sintered bronze inlet filter to protect the seating mechanism from particulate contamination, while the external self-reseating relief valve provides a critical layer of safety by venting excess pressure if necessary. The precision-machined nozzle and Delrin insert bushing allow for smooth, low-friction adjustment of delivery pressure.

This regulator is optimized for applications where slight delivery pressure increases—common in single-stage regulators as cylinder pressure drops—will not critically affect the operation. It represents a balance of heavy-duty construction and cost-effective single-stage performance, suitable for manufacturing, fabrication, and maintenance operations.