ACETYLENE / OXYGEN MUREX CHECK VALVES FOR CUTTING TORCH USE

The MUREX Oxygen and Acetylene Check Valves for cutting torch use are essential safety accessories designed for oxy-fuel welding, cutting, and heating applications. They function as a first line of defense against dangerous gas conditions.

It is important to note that these are Check Valves, not Flashback Arrestors, and should be used in conjunction with regulator-mounted Flashback Arrestors for complete protection.

Description and Key Function
A check valve is essentially a Gas Non-Return Valve (NV).

The primary function of the MUREX Check Valve is to:

Prevent Reverse Gas Flow: They allow gas to flow in only one direction (from the hose to the torch). In the event of an imbalance in pressure, such as a slight back-pressure or when the torch is shut off, the valve closes instantly to stop the backward movement of gas.

Stop Dangerous Gas Mixing: By preventing reverse flow, the check valves ensure that oxygen cannot flow back into the fuel gas line (like acetylene) and the fuel gas cannot flow back into the oxygen line. If the two gases mix upstream, they create a highly explosive environment in the hoses or regulators.

Typical Features and Application
Application Location: They are typically installed at the inlet of the cutting torch or welding shank (where the hoses connect to the torch handle).

Construction: MUREX check valves are usually constructed with a durable copper or brass body.

Color-Coding: They are often color-coded for safety and to prevent cross-connection:

Oxygen (usually blue or green)

Fuel Gas (Acetylene, Propane, etc. - usually red or black)

Thread Specification: They come with standard welding thread sizes and handedness to match the torch connections:

Oxygen: Right-Hand (RH) threads.

Fuel Gas (Acetylene/Propane): Left-Hand (LH) threads.

Safety Role: They provide basic, immediate protection against a gas back-surge, which can be caused by improper shut-down procedures or pressure fluctuations.

In summary, the MUREX Check Valve is a dedicated non-return valve whose sole purpose is to maintain the one-way flow of gas and prevent the mixing of oxygen and fuel gas in the hose and torch lines. For comprehensive safety, they are always recommended as a pairing with full-feature Flashback Arrestors mounted at the regulator.