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Purge Assemblies

Safely removing contaminants

Purging is an important procedure that is often overlooked in gas processes. This process should be done to remove contaminants such as air and water vapor from the gas delivery system before initial and subsequent system startups. To improve safety in the workplace, purging should also be done to remove residual corrosive or toxic gases before changing out cylinders.

Purge assemblies provide a safe means to introduce the purge gas into a system after the service gas cylinder has been connected. Air Liquide offers a variety of purge assemblies designed specifically for this service, allowing you to securely purge delivery systems while the gas cylinder is still connected.

Available products

Tee Purge Assemblies 
Model P5
Model P5 tee purge assemblies are designed to be used as a complete assembly between the gas pressure regulator and the cylinder outlet. They have a 1/4" NPT Male connection that can be assembled into the regulator inlet port in place of the normal cylinder fitting.


Cross Purge Assemblies 
Model P74
These cross purge assemblies have been developed to permit the user to flush a regulator with inert gas both prior to use and after use. They are commonly used when controlling a toxic, corrosive or pyrophoric gas and are primarily designed for stainless steel regulators, such as Models 213, 217 and 2172.


SilcoNert® Treated Cross Purge Assemblies
Model SN4P74
Model SN4P74 cross purge assemblies are ideal for use with low level reactive calibration gas mixtures. Used between the gas cylinder and gas pressure regulator, they provide a means to introduce the purge gas into the system, isolate the regulator and flush contaminants through a vent valve. These assemblies are designed for incorporation into Models SN206 and SN216 (SilcoNert 2000 treated regulators). The SilcoNert 2000 treatment eliminates surface adsorption of reactive gases for unsurpassed analytical accuracy. Each unit is supplied with a check valve and shut-off valve.