Victor 0781-3505 Two Stage Oxygen Regulator 4-80 Psig

Product Description

The VICTOR 0781-3505 is a medium-duty, two-stage oxygen regulator from the VTS 250 Series designed to maintain a constant delivery pressure as inlet pressure decreases over the working life of a cylinder. The die-forged brass body and spring housing cap deliver the structural integrity required for high-pressure oxygen service. Delivery pressure ranges from 4 to 80 psig with a maximum inlet pressure of 3000 psig. The 0.082 Cv flow coefficient supports medium to high capacity general-purpose cutting, welding, and gas distribution applications. Licensed gas equipment technicians and welding professionals are the primary installers of this regulator.

The 0781-3505 is suited for applications where consistent, accurate outlet pressure is critical and where fluctuating delivery pressure would affect work quality or test results. The CGA 540 inlet connection pairs with standard high-pressure oxygen cylinders. The 9/16 inch-18 RH(M) outlet connection is standard for medium-duty oxygen service hoses and torches. This regulator is appropriate for general-purpose industrial, fabrication, and laboratory oxygen systems requiring stable two-stage regulation.

Key Features

• Two-stage regulation maintains constant delivery pressure across a decreasing inlet pressure range
• Die-forged brass body and spring housing cap for strength and durability in high-pressure service
• Fabric-reinforced neoprene diaphragm (1.3 inches and 1 3/4 inches) for precise, long-lasting performance
• Electroless nickel-plated bronze sintered inlet filter protects internal components
• Delrin insert bushing and stainless ball-in-key mechanism for smooth, easy pressure adjustment
• Precision-machined nozzle and stem-type seat mechanism for maximum flow control and positive sealing
• External self-reseating relief valve and pretested adjusting spring for quality assurance

Compatibility

Designed for use with standard high-pressure oxygen cylinders using a CGA 540 inlet connection. Outlet connection is 9/16 inch-18 RH(M), compatible with standard medium-duty oxygen service hoses and torch assemblies.

Installation Notes

Installation should be performed by a qualified welding equipment technician or licensed gas professional. Always close the cylinder valve and bleed all pressure from the regulator before connecting or disconnecting. Do not use thread sealants, lubricants, or oil on any oxygen regulator fitting, as contact with hydrocarbons in an oxygen-enriched environment creates a fire and explosion hazard. Verify all connections are wrench-tight and leak-tested with an approved oxygen-compatible leak detection solution before placing the regulator into service.

Technical Specifications

• Regulator Type: Two Stage, Medium Duty
• Gas Type: Oxygen
• Delivery Pressure Range: 4 to 80 psig
• Maximum Inlet Pressure: 3000 psig
• Inlet Gauge Range: 4000 psig
• Outlet Gauge Range: 100 psig
• Cv Flow Coefficient: 0.082
• Inlet Connection: CGA 540
• Outlet Connection: 9/16 inch-18 RH(M)
• Gauge Size: 2 inches steel
• Diaphragm: Fabric-reinforced neoprene, 1.3 inches and 1 3/4 inches
• Body Material: Die-forged brass
• Inlet Filter Material: Electroless nickel-plated bronze sintered
• Dimensions: 7 inches x 7.4 inches x 6.3 inches
• Weight: 4.2 pounds
• UPC: 716352093965

Standard Information

• Brand: VICTOR
• Manufacturer Part Number: 0781-3505