MUREX FLASHBACK ARRESTOR FOR WELDING REGULATOR OXYGEN (BLUE) / ACETYLENCE (RED)

MUREX FLASHBACK ARRESTOR Description

The MUREX Flashback Arrestor is a gas safety device designed to prevent personal injury and equipment damage from a severe flashback during oxy-fuel welding and cutting operations.

Based on common models like the MUREX VFA 83 Series, here is a general description and a list of key features:

General Description
The Murex Flashback Arrestor is typically used in pairs—one for the oxygen line and one for the fuel gas line (e.g., Acetylene, Propane, Natural Gas). They are generally fitted either to the regulator outlet or to the torch inlet to prevent a flame or a reverse flow of gases from traveling upstream into the hoses, regulators, and ultimately the gas cylinders, which could cause a catastrophic explosion.

Key Features and Safety Elements
MUREX flashback arrestors usually incorporate multiple safety features, which may vary slightly by model (e.g., VFA 83 series or torch-mounted versions):

Sintered Metal Flame Arresting Filter (FA):

This is the core component that quenches (extinguishes) the flame from a flashback. It is a porous metal element that cools the flame front below the ignition temperature of the gas mixture.


Built-in Non-return Valve (NV) / Check Valve:

Designed to prevent the reverse flow of gas, which stops a dangerous mixture of oxygen and fuel gas from forming in the hose or equipment. Many MUREX models feature an automatic reset non-return valve.

Pressure-Sensitive Cut-off Valve (PV) (on some models):

This component (often on regulator-mounted units) is activated by the pressure shock of a flashback and automatically cuts off the gas supply. Resettable versions may have an indicator to show it has been activated.

Temperature-Activated Cut-off Valve (TV) (on some models):

This is a heat-sensitive component that automatically closes and stops the gas flow in the event of a sustained burn-back or fire when the temperature rises to a set point (e.g., around 100