Why is a check valve installed in an oxy-acetylene gas line?

A check valve is specifically designed to prevent reverse flow of gases in a system, ensuring that gas only flows in one direction. In the context of an oxy-acetylene gas line, this is critically important to maintain safety and prevent the mixing of acetylene and oxygen inappropriately. If backflow were to occur, it could lead to dangerous situations, including the risk of explosion or combustion when the gases mix.

The function of the check valve directly correlates to the safety of the welding operation. By preventing reverse flow, it ensures that the pressurized gases remain within their designated lines, maintaining the integrity and purity of each gas.

While increasing pressure, preventing gas leaks, and adjusting flow rates are important aspects of managing gas lines, they are not the primary functions of a check valve in this scenario. The design of a check valve focuses exclusively on controlling the direction of flow, making it an essential component for preventing hazardous conditions in oxy-acetylene applications.