API · ASME · DIN · EN standard industrial valves
Strainers
In-line filtration devices protecting pumps, valves and instruments from solid contamination.
Last updated: 2026-11
Family specifications
| designs | Y-Type, Simplex Basket, Duplex Basket |
|---|---|
| body materials | WCB (ASTM A216), LCB, LCC (ASTM A352), F11, F22 (ASTM A182), CF8, CF8M (ASTM A351), F316, F316L (ASTM A182), F51/2205 duplex (ASTM A182), F53, F55/2507 super duplex (ASTM A182), C95400, C95800 aluminium bronze (ASTM B148), nickel-chromium alloy 625, nickel-copper alloy 400, nickel-molybdenum alloy C276 (ASTM B564) |
| design focus | Structural strength under line pressure, open area and flow distribution, differential pressure behaviour, ease of maintenance and element replacement |
| operation | Continuous flow during element cleaning (duplex basket), Shutdown required for cleaning (Y-type, simplex basket) |
| size range | DN25 to DN500 |
| pressure class | ANSI Class 150 to Class 300 |
| testing standards | API 598 |
| temperature range | 0 to 200°C (ductile iron Y-type strainer, water/steam/gas media) |
| document basis | Selection, installation and maintenance guidance follows the FCI Engineering Specification for the Selection, Installation and Maintenance of Pipeline Strainers (Fluid Controls Institute, Pipeline Strainer Section, 2021). |
| retention range | The common strainer particle-retention range runs from 1 inch down to 40 micron (0.0016 inch), set by the choice of perforated metal, mesh or wedge-wire straining element. |
| vertical installation | On vertical piping a Y strainer must be installed with its screen pointing downward so sediment is trapped in the debris collection chamber; install the strainer with the debris chamber at the lowest possible position. |
| duplex purpose | Duplex/twin basket strainers exist for lines that cannot be shut down for basket cleanout: flow switches to the second basket while the first is removed, cleaned and replaced. |
| maintenance practice | Schedule cleaning from the established clogging rate: pressure gauges on each side of the strainer show when cleaning is required, and differential pressure switches can drive warning lights or alarms. |
| basket construction | The basket or screen is the heart of the strainer; baskets are offered in stainless steel, nickel-copper alloy or brass across a wide range of perforations and mesh, removing solids from 1/2 inch and larger down to 40 microns. |
| stn1 npt pressure temperature ratings | 250 PSIG @ 406°F - Steam, 400 PSIG @ 150°F - WOG |
| stn1 flanged pressure temperature ratings | 125# FLG 125 PSIG @ 450°F - Steam, 125# FLG 200 PSIG @ 150°F - WOG, 250# FLG 250 PSIG @ 450°F - Steam, 250# FLG 500 PSIG @ 150°F - WOG |
| stn1 screen seat fit | Machined seat assures perfect fit for screen |
| stn1 screen maintenance features | Blowdown connection and easily removable stainless steel cylindrical screens for easy maintenance |
| stn1 body construction | Durable cast iron body |
| stn1 wog rating definition | WOG = Water, Oil or Gas |
| stn1 installation orientation | installed in the flow direction as indicated on the body in either a vertical down or horizontal pipeline |
| stn1 maintenance access | The strainer must be accessible for periodic cleaning. |
| stn2 body construction | Flanged cast iron strainer |
| stn2 port design | Pre-drilled ports |
| stn2 service media | works for steam, air, water, oil and gas lines |
| stn2 system fit | Ideal for lower capacity piping systems |
| stn2 cover cleaning design | blow-off bottom cover for easy cleaning without removing the screen |
| stn2 screen design | self-aligning cylindrical screens |
| stn2 standard screen material | Stainless steel screen is standard |
| stn2 material screen options | body castings and strainer screens are available in a variety of materials, perforations and mesh linings |
| stn2 steam rating | Use for steam applications up to 125 psi at 350°F. |
| stn2 wog rating | Use for water, oil and gas applications up to 175 psi at 150°F. |
| stn3 applicable fluids | Steam, Air, Water |
| stn3 body materials | Stainless Steel, Cast Iron, Ductile Cast Iron |
| stn3 connection types | Screwed, Flanged |
| stn3 y3 model envelope | Y3 Stainless Steel Screwed 15 - 50 2.1 220 60 |
| stn3 yf model envelope | YF Cast Iron Flanged 15 - 350 0.98 200 40 |
| stn3 ydf model envelope | YDF Ductile Cast Iron Flanged 15 - 250 0.98** 40 |
| stn3 double layer screen | Double-layer stainless steel screen with large surface area ensures trouble-free operation |
| stn3 inline cleaning design | Designed for easy inline cleaning and maintenance |
| stn3 y3 all stainless design | Model Y3 made entirely of stainless steel |
Ordering & documentation
Documents
Ask for the documentation set with the inquiry — typical items (material certificates, test reports to the listed inspection standard, dimensional drawings) are confirmed and supplied with the quotation.
Quotation
Send the medium, temperature, pressure, size and connection for a quotation-ready inquiry. Lead time, MOQ and price are confirmed at quotation, together with the documents to be supplied with the order.
Sample & supply
Supply terms, order quantities and lead time are agreed per order — state the destination country and required schedule with the inquiry.
Storage & shipping
Store valves with seats and seals protected from UV, ozone and deformation, and keep end-face protectors on until installation; storage limits and shipping arrangements for the selected materials are confirmed at quotation.
Frequently asked questions
What sizes and pressure ratings are available for strainers?
The published size range is DN25 to DN500, and the published pressure ratings are ANSI Class 150 to Class 300. Availability of a specific size and rating is confirmed at quotation.
What materials are strainers available in?
The published specification lists body materials: WCB (ASTM A216), LCB, LCC (ASTM A352), F11, F22 (ASTM A182), CF8, CF8M (ASTM A351), F316, F316L (ASTM A182), F51/2205 duplex (ASTM A182), F53, F55/2507 super duplex (ASTM A182), C95400, C95800 aluminium bronze (ASTM B148), nickel-chromium alloy 625, nickel-copper alloy 400, nickel-molybdenum alloy C276 (ASTM B564). Material availability for a specific size and rating is confirmed at quotation.
What working temperature range do strainers cover?
The published working temperature range is 0 to 200°C (ductile iron Y-type strainer, water/steam/gas media). For a medium at the edge of the range, confirm the suitability of the selected seat and body materials at quotation.
What should a quotation inquiry for strainers include?
The governing standard and class, nominal size, body and seat materials, the service medium with temperature, and the destination — anything missing is confirmed during quotation.
Types in this family
Type
Y Strainers
Y strainers fit inline like a check valve, their angled leg holding a perforated or mesh screen that catches weld beads, scale, sand and other debris ahead of p
View specifications →Type
Simplex Basket Strainers
Simplex basket strainers house a single removable basket in a vertical-chamber body: flow passes into the basket, debris stays behind, and clean liquid leaves t
View specifications →Type
Duplex Basket Strainers
Duplex basket strainers put two straining chambers and a changeover valve in one assembly, so one basket keeps working while the other is switched in and cleane
View specifications →Request a quote for strainers
Submit the requirement here — a quotation-ready inquiry states the governing standard and class, size, materials, medium, temperature and destination.
What happens to your details is described in our privacy notice.
Get a quotation for Strainers
Send the standard, pressure class and size for a quotation-ready inquiry — answered with documents and terms.