Y-Strainer Selection & Sizing Guide

A Y-strainer (wye strainer) protects pumps, valves, meters, and nozzles by trapping pipe scale, weld slag, and debris before it reaches sensitive equipment. Getting the screen and orientation right is what makes it work.

Screen: mesh vs. perforation

Strainer screens come as perforated (round holes, coarser — for general pipe debris) or mesh (woven wire, finer — for protecting pumps, meters, and spray nozzles). For most liquid service, a 20-mesh screen is a common starting point; finer mesh protects tighter equipment but clogs faster. To convert mesh to particle size, see our mesh-to-micron conversion chart.

Orientation matters

Install so the screen pocket can collect and be blown down: on horizontal liquid lines, point the pocket down. On steam or gas lines, point the pocket horizontally (sideways) so condensate doesn't pool in it. Flow must enter through the inlet marked by the body arrow.

Add a blowdown valve

Fit a blowdown valve (or plug) at the bottom of the screen pocket so you can flush trapped debris without removing the cap. On dirty start-up lines this saves a lot of downtime.

Sizing

Strainers are sized to the line, but check pressure drop: a clogged screen raises ΔP fast. For pump protection, confirm the clean-screen pressure drop is acceptable and plan a cleaning interval. Larger straining area (a basket strainer) is better for very dirty service or where you can't shut down often.

Material

Match the body to the service — see the body material guide. Stainless screens resist corrosion and last longer than plated steel.

Shop strainers

Browse Y-strainers and wye strainers: view strainers. Need help sizing for a pump or meter? Contact us with your line size and flow.