In most cases this is the gas supply pressure for nozzles that spray two mixed fluids, a liquid and a gas. Since the unit may differ from that used in the nozzle manufacturer's catalog, the SGS provides a function that allows units to be converted to a common unit of your choice for displaying search results.
The pressure of the Assist Gas that is usually measured in pounds per square inch (psi). With oxygen, gas pressure can range from 15 to 50 psi. With inert gases, the gas pressure can range from 30 to 200 psi.