951001 - ESAB Fuel Gas Reverse Flow Check Valve B-Size

Reliable Reverse Flow Prevention for Industrial Safety

The ESAB 951001 Fuel Gas Check Valve is a critical safety component designed for professional oxy-fuel cutting, welding, and heating applications. Engineered to meet stringent industrial safety standards, this valve serves a singular, vital purpose: to prevent the reverse flow of gases. In oxy-fuel systems, a pressure imbalance can inadvertently force oxygen into the fuel line or vice versa, creating a volatile mixture within the hose or regulator. This check valve utilizes a spring-loaded mechanism that remains open during normal flow but instantly seals shut if back-pressure is detected, effectively isolating the fuel line from reverse flow contamination.

Robust Construction and Compatibility

Manufactured from high-quality brass, the ESAB 951001 offers superior durability and resistance to corrosion, ensuring a long service life even in harsh workshop environments. The unit features standard B-Size (5/8"-18 LH) connections, making it universally compatible with most industrial fuel gas hoses, torches, and regulators in the North American market. The Left-Hand (LH) thread specifically designates it for fuel gas service (Acetylene, Propane, Propylene, Natural Gas), preventing accidental connection to oxygen lines. Its compact form factor ensures that it does not add significant weight or bulk to the torch assembly, maintaining operator ergonomics during extended use.

Essential for Compliance and Risk Mitigation

While often confused with flashback arrestors, check valves are a distinct and necessary first line of defense. While they do not stop a flame front, they prevent the conditions—mixed gases in the hose—that allow a flashback to occur in the first place. Integrating the ESAB 951001 into your gas distribution system is a proactive measure to protect personnel and equipment. It is highly recommended to inspect check valves regularly for flow capacity and leak integrity to maintain optimal safety performance.

• Gas Compatibility: Suitable for all standard fuel gases.


• Connection Style: Male/Female B-Size (CGA 023 equivalent specs).


• Mechanism: Spring-actuated plunger for immediate sealing.