Y strainers are devices for mechanically removingsolids from flowing liquids or gases by means ofa perforated or wire mesh straining element. They are used in pipelines to protect equipment suchas pumps, meters, control valves, steam traps and regulators.Although there are occasional exceptions, the use ofY strainers generally follows several rules.First, they are ordinarily employed where the amount of material to be removed is small. Size forsize, their dirt holding capacity is less than a basket strainer. Next, Y strainers are usually installedwhen frequent clean-out is not needed. There are Y strainers in service on steam lines, forexample, that are not cleaned more than once a year. Generally, Y strainers are used with gasessuch as steam or air. Basket strainers are used with liquids.