639209 - Victor 88-4 CVR Regulator Mount Check Valve Set

Reliable Reverse Flow Prevention for Oxy-Fuel Regulators

The Victor 88-4 CVR Regulator Check Valve (SKU: 639209) is an essential safety component designed to prevent the reverse flow of gases in oxy-fuel welding and cutting systems. Reverse flow occurs when unequal pressures in the oxygen and fuel gas lines cause one gas to back up into the other's hose or regulator. If these gases mix, they create a highly explosive compound that can lead to catastrophic equipment failure or injury. The 88-4 CVR series is specifically engineered to mount directly onto the regulator outlets, stopping this backflow at the source before it can enter the delicate regulator diaphragm or the cylinder.

Constructed from high-quality brass, these check valves are built to withstand the rigorous demands of industrial environments. The internal mechanism features a spring-loaded valve that remains open during normal flow but snaps shut instantly if downstream pressure exceeds upstream pressure. This "Check Valve Regulator" (CVR) configuration is distinct from torch-mount models, ensuring that the safety device is positioned to protect the most expensive components of your gas delivery system. The set typically includes valves for both oxygen and fuel gas, utilizing standard "B" size (9/16"-18) connections—right-hand threads for oxygen and left-hand threads (notched) for fuel—to prevent cross-connection errors during installation.

While check valves are a vital safety measure, it is important to note that they do not stop a flame front (flashback). For complete protection, they should be used in conjunction with flashback arrestors. However, the 88-4 CVR offers low cracking pressure, meaning it introduces minimal resistance to gas flow, maintaining the performance of your torch while adding a necessary layer of security. Regular testing and inspection of check valves are recommended to ensure the internal springs and seals remain functional and free of contaminants.