Y Strainers take their name from their configuration. They are typically used in application where the amount of solid to be removed is small, and where frequent clean - out is not required. They are most commonly used in pressurized line, gas or liquid, but can also be used in suction or vacuum conditions.
A Y-Strainer has the advantage of being able to be installed in either a horizontal or vertical position. However, in both cases, the screening element or "leg" must be on the "downside" of the strainer body so that entrapped solids can be properly collected and held for disposal. A blow down plug on the drain port will allow clean- out without removal of the screen, and without interrupting the process flow.