The Wilhelmsen Unitor W-66S Oxygen Flashback Arrestor is a professional gas safety device designed for installation in oxygen lines used in oxy-fuel welding, cutting and heating systems.
The W-66S provides multiple layers of protection against potentially dangerous gas-flow and flame conditions. It incorporates a non-return valve to prevent reverse gas flow, while its flame-arresting element helps stop a flame front from travelling backwards through the gas line.
The unit also incorporates pressure- and temperature-activated safety functions designed to shut off gas flow when abnormal conditions occur. A blue signal/reset lever provides an indication of activation of the pressure-sensitive shut-off and allows the device to be manually reset when appropriate.
With a published maximum flow rate of 10.5 m³/h, the W-66S is designed for professional oxy-fuel gas installations where reliable flashback protection is required.
Key Features
- Brand: Wilhelmsen Unitor
- Model: W-66S
- Part Number: 302976
- Gas: Oxygen
- Maximum Flow Rate: 10.5 m³/h
- Professional oxygen flashback arrestor
- Helps prevent dangerous flame propagation
- Integrated non-return valve
- Helps prevent reverse gas flow
- Pressure-sensitive gas shut-off
- Temperature-sensitive gas shut-off
- Blue signal/reset lever
- Heavy-duty construction
- Designed for oxy-fuel welding and cutting systems
- Suitable for professional workshop and industrial applications
Safety Functions
Flashback Protection:
The internal flame-arresting element helps prevent a flame front from travelling backwards through the oxygen supply line.
Non-Return Valve:
The integrated non-return valve prevents gas from flowing backwards through the system, helping reduce the risk of oxygen and fuel gas mixing.
Pressure Shut-Off:
The pressure-sensitive safety mechanism is designed to shut off the gas supply when abnormal pressure conditions associated with a flashback are detected.
Thermal Shut-Off:
The temperature-sensitive mechanism provides additional protection by shutting off gas flow when excessive heat reaches the arrestor.
Signal/Reset Lever:
The blue lever provides a visual indication of activation and allows the safety mechanism to be manually reset when the operating conditions have been checked and it is safe to do so.
Technical Specifications
- Manufacturer: Wilhelmsen Unitor
- Model: W-66S
- Part Number: 302976
- Gas: Oxygen
- Maximum Flow: 10.5 m³/h
- Product Type: Oxygen flashback arrestor
- Application: Oxy-fuel welding, cutting and heating
- Safety Functions: Flame arresting, non-return, pressure shut-off and thermal shut-off
- Reset: Manual reset via signal/reset lever
- Standard: EN 730-1 / ISO 5175
Suitable For
- Oxy-acetylene welding systems
- Oxy-fuel cutting systems
- Gas welding workshops
- Metal fabrication
- Engineering workshops
- Industrial gas installations
- Flame heating applications
- Welding and cutting equipment
- Professional maintenance and repair operations
Why Use a Flashback Arrestor?
Flashback can occur when a flame travels backwards from the torch towards the gas supply. In an oxy-fuel system, this can create serious hazards for hoses, regulators and other connected equipment.
A correctly selected flashback arrestor provides an additional layer of protection by combining flame arresting and non-return functions with automatic safety shut-off mechanisms.
The Unitor W-66S is therefore suitable for users who require professional protection for oxygen gas lines in oxy-fuel welding and cutting installations.
Important Installation & Safety Note
This is a safety-critical oxygen gas component. It must be installed in the correct gas line and matched to the applicable gas, connection, flow rate and operating conditions.
The oxygen version must not be substituted with an acetylene/fuel-gas version. Installation, testing, inspection and resetting should be carried out in accordance with the manufacturer’s instructions and applicable oxy-fuel safety requirements.
Do not modify, dismantle or bypass the flashback arrestor.
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