Flanged Y-Type Strainers
Flanged Y-type strainers are filter fittings bolted between flanges ahead of equipment such as control valves, heat exchangers, pumps and meters on heating, cooling, steam and process lines, continuously holding back dirt on large-bore pipework. The screen chamber is closed by a bolted cover; cleaning is done by removing the cover.
Body material is chosen to suit the operating conditions: grey cast iron PN6 and PN16, ductile iron PN16 and PN25, cast steel PN25 and PN40, cast stainless PN16–PN40. Sizes start at DN15; cast steel bodies go up to DN500, with straight-through types from DN250 upwards. Face-to-face length follows EN 558 series 1, so the line dimension is kept with valves of the same size.
Main Applications
- Central heating and cooling circuits
- Steam distribution and condensate lines
- Heat exchanger and control valve inlets
- Cooling tower and chiller circuits
- Stainless lines in chemical and food processes
Technical Data
| Connection | Flanged; EN 1092-1 / EN 1092-2 |
|---|---|
| Face-to-face | EN 558 series 1: 130 mm (DN15) · 600 mm (DN200) · 1350 mm (DN500) |
| Grey cast iron | PN6 / PN16, DN15–300, up to 300 °C |
| Ductile iron | PN16 DN15–300, PN25 DN15–150, up to 350 °C |
| Cast steel | PN25 / PN40, DN15–500, up to 450 °C |
| Cast stainless | PN16–PN40, DN15–200, up to 400 °C |
| Standard screen | 1 mm (DN15–50) · 1.25 mm (DN65–80) · 1.6 mm (DN100–300) · 3 mm (DN350–500) |
| Fine screen | 0.25 mm (DN15–300) · 0.8 mm (DN350–500) |
| Kvs (clean screen) | 6.9 (DN15) · 61 (DN50) · 234 (DN100) · 1873 m³/h (DN300) |
| Pressure at temperature | Cast steel PN40: 23.8 bar at 400 °C |
| Screen reinforcement | Ring from DN50, support basket from DN150 |
| Magnet option | Bar magnet up to 450 °C, permanent magnet up to 210 °C |
Material Options
| Part | PN16 · grey cast iron | PN25 · ductile iron | PN40 · cast steel | PN40 · stainless |
|---|---|---|---|---|
| Body | EN-GJL-250 (EN-JL1040) | EN-GJS-400-18U-LT (EN-JS1049) | GP240GH+N (1.0619+N) | GX5CrNiMo19-11-2 (1.4408) |
| Cover | Same as body | Same as body | Same as body | Same as body |
| Screen | Stainless steel | Stainless steel | Stainless steel | Stainless steel |
| Cover gasket | Depending on model | Depending on model | Depending on model | Depending on model |
| Cover bolts | Depending on model | Depending on model | Depending on model | Stainless, depending on model |
| Drain plug | On the cover | On the cover | On the cover | On the cover |
Selection note: Screen mesh is chosen according to the smallest passage in the protected equipment; since a fine screen increases pressure loss, it can be used during commissioning and then replaced with the standard screen. On large sizes, fitting a pressure gauge before and after the strainer allows screen blockage to be monitored by differential pressure.
Advantages
Line Length Match
- EN 558 series 1 face-to-face.
- Easy to place instead of or beside a valve.
Four Body Options
- Grey iron, ductile iron, steel, stainless.
- The right class for pressure and temperature.
High Kvs
- 234 m³/h at DN100 with a clean screen.
- Low pressure loss.
Reinforced Screen
- Ring and basket on large sizes.
- The screen does not collapse at high differential pressure.
Magnet Option
- Catches iron particles separately.
- Effective in condensate and closed circuits.
Construction and Design Features
- Flanged Y body with angled screen chamber
- Bolted cover with drain plug on the cover
- Perforated cylindrical stainless screen
- Reinforced screen design from DN50
- Straight-through body option on large sizes
Send the size, pressure class, fluid, temperature and required screen mesh through the Request a Quote form; we will prepare the flanged strainer in the right body material.
How to Choose?
- Define pressure and temperatureIf the operating point exceeds 300 °C for grey iron or 350 °C for ductile iron, move to a steel body.
- Match size to the lineKeep the strainer size the same as the pipe and valve size.
- Choose screen meshSelect a standard or fine screen according to the narrowest passage in the protected device.
- Check pressure lossCalculate the loss with a clean and a dirty screen from the Kvs value.
- Leave maintenance spaceAllow room for the cover and screen to be pulled out during installation.
Complementary Products
Why ORFA?
Other Y-Type Strainers
Our Flanged Y-Type Strainers
ORFA supplies flanged y-type strainers in a range of pressure classes, sizes and connection types to suit your application. Descriptions, technical specifications, materials and dimension tables are available on each detail page.
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