188W20 - 3/4 Inch Oxygen Poppet Check Valve

Industrial Grade Oxygen Backflow Prevention

The ESAB 188W20 is a high-capacity Check Valve designed specifically for Oxygen service in industrial oxy-fuel applications. Engineered with a 3/4-inch connection, this valve is intended for use in manifold systems, station drops, or heavy-duty supply lines where standard torch-mount valves are insufficient for the required flow rates. The primary function of this component is to permit gas flow in only one direction, effectively preventing the reverse flow of gases which can lead to dangerous contamination or hazardous gas mixtures within the piping system.

The internal mechanism utilizes a poppet-style design. Unlike simple swing checks or ball checks, a poppet valve typically employs a spring-loaded sealing element that presses against a machined seat. This ensures a positive seal even at low back-pressures and allows for installation in various orientations, although flow direction must always be observed. The poppet design is favored in gas applications for its quick response time to flow reversal and its ability to minimize pressure drop across the valve during normal operation, which is critical for maintaining stable downstream pressure for cutting or heating operations.

Constructed from high-quality brass, the body of the 188W20 is built to withstand the rigors of industrial environments and is compatible with oxygen service requirements. Proper cleaning for oxygen service is implied for such components to prevent combustion hazards. This valve acts as a critical line of defense in gas distribution networks, protecting upstream equipment and gas sources from the potential ingress of fuel gases or atmospheric contaminants. It is a fundamental component for facility managers and welding engineers designing or maintaining compliant and safe gas distribution systems.