CV-21L - Uniweld CV-21L Torch Check Valve - Fuel Gas B-Fitting

Uniweld CV-21L: Reliable Reverse Flow Protection

Upgrade your oxy-fuel safety setup with the Uniweld CV-21L Torch Check Valve. Designed specifically for the fuel gas side of your equipment, this valve serves as the first line of defense against reverse flow conditions. Reverse flow can occur when a tip becomes clogged or when one cylinder runs empty, potentially allowing gas to travel back up the hose. The CV-21L utilizes a spring-loaded valve mechanism that closes instantly if pressure on the downstream side exceeds the upstream pressure, effectively stopping backflow before it becomes a hazard.

Robust Construction

Built to withstand the rigors of industrial environments, the CV-21L features a rugged brass body and internal components designed for longevity. It connects easily to any standard torch handle with "B" size (9/16"-18) fuel inlets. The Left-Hand thread ensures it cannot be accidentally mismatched with oxygen equipment. Unlike bulky flashback arrestors, this check valve is streamlined and lightweight, making it ideal for applications where torch balance and maneuverability are critical.

Why Use Check Valves?

While flashback arrestors stop flames, check valves are designed to stop the mixture of gases that causes the explosion in the first place. By installing the CV-21L at the torch, you prevent fuel gas from backing into the oxygen hose (or vice versa if paired with an oxygen check valve), significantly reducing the risk of a hose explosion. It is a cost-effective and simple safety upgrade that every professional welder and fabricator should utilize.

Compatibility

This unit is compatible with all standard fuel gases used in welding and cutting. Whether you are running Acetylene, Propane, or MAPP gas, the CV-21L provides consistent, reliable performance. Note that check valves should be tested regularly to ensure they are sealing correctly and free from debris.