Strainer Valve 6-Inch

Export-Ready for Water, Power & Industrial Projects Worldwide

origin Mumbai (JNPT) | CIF worldwide | EN 10204 3.1 certs | IBR available

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Bucket Strainer — 6" Class 150 Flanged

Supreme Valves India manufactures Bucket Strainers (also called basket strainers) in sizes 1/2" to 24" with Class 150 and PN16 pressure ratings. The 6" (DN150) flanged bucket strainer is designed to protect pumps, meters, and downstream equipment in water supply, cooling water, and industrial process pipelines by removing suspended solids such as rust, scale, sand, and organic matter. The bucket/basket design provides up to 4× the screen area of a comparable Y-type strainer, significantly reducing pressure loss and extending time between cleanings. Available in cast iron ASTM A126B for general water service and ductile iron ASTM A395 for higher pressure ratings or demanding applications. The filter screen is SS304 as standard, with SS316L available for corrosive service.

Strainer Type Selection — Y-Type vs. Basket (Bucket)

Y-Type Strainer

  • Compact — fits in limited spaces
  • Ideal for sizes 1/2\" to 4\"
  • Blow-off cap for quick cleaning
  • Lower screen area (more pressure drop)
  • Lower cost for small sizes
  • Not ideal for high-solids applications

Basket (Bucket) Strainer — Recommended for 6"

  • Large debris-holding capacity
  • Recommended for sizes above DN100 (4\")
  • Removable basket for thorough cleaning
  • High screen area = minimal pressure drop
  • Handles raw water and high-solids service
  • Ideal for pump suction strainers

Materials of Construction (MOC)

Component Material Specification
Body & Bonnet Ductile Iron (ASTM A536 / EN-GJS-400-15)
Stem / Spindle SS 410 / SS 420
Seat / Trim EPDM / NBR / Bronze

Technical Specifications

Parameter Specification / Standard
Manufacturing / Design Standard EN 1171 / AWWA C509 / BS 5163
Testing Standard API 598 / EN 12266-1
Pressure Rating PN16 / PN25

Frequently Asked Questions

What is the difference between a Y-type strainer and a basket (bucket) strainer?

Y-type and basket (bucket) strainers differ in design, capacity, and maintenance approach. Y-type strainers have a Y-shaped body with the screen element forming one leg of the Y. They are compact and suitable for smaller pipe sizes (1/2" to 4") and for applications where the collected debris volume is low. The blow-off cap allows cleaning without removal. Basket strainers have a rectangular or cylindrical 'basket' element that hangs within the strainer body — offering significantly larger screen surface area and debris-holding capacity. Basket strainers are preferred for: large pipe sizes (above DN100/4"), high-solids applications (raw water, cooling towers, river intake), and where longer intervals between cleaning are desired. The basket is removed for cleaning rather than blown off.

What is the maximum working pressure of a 6 inch Class 150 cast iron strainer?

A 6-inch Class 150 cast iron (ASTM A126B) strainer is rated for a maximum working pressure of 285 PSI (19.6 bar) at 38°C per ASME B16.42 (the standard for Class 125 and Class 250 cast iron flanged fittings). At 200°C, the rating reduces to approximately 180 PSI. For comparison, a ductile iron (ASTM A395) strainer at the same rating can handle approximately 480 PSI at 38°C due to ductile iron's higher yield strength, making it preferred for higher-pressure applications or where pressure surges are expected.

What screen perforation options are available for a 6 inch strainer?

For a 6-inch (DN150) strainer, standard screen perforation options range from 0.5mm to 5.0mm. For raw water intake: 3.0mm to 5.0mm (coarse). For cooling tower water: 1.0mm to 2.0mm (medium). For boiler feedwater and steam: 0.5mm to 1.0mm (fine). For instrument air: 40-mesh to 100-mesh (very fine). The screen is typically constructed from SS304 for general service and SS316L for corrosive or offshore environments. The screen area of a 6-inch basket strainer is typically 3–5× the pipe cross-sectional area, providing low pressure drop even at high solids loading.

Is a 6 inch strainer considered a 'bucket' strainer?

The term 'bucket strainer' refers specifically to a strainer with a basket-shaped screen element that captures debris in a collection chamber — not a Y-shaped screen. For a 6-inch (DN150) strainer, both Y-type and basket designs are available, but the basket design is far more common at this size due to its superior debris-holding capacity. A Y-type 6-inch strainer has a significantly larger body than a 4-inch but the basket design provides 3–4× more screen area. For the inquiry's 'Bucket Strainer' specification, we recommend a basket-type design for DN150.

What applications is a 6 inch Class 150 strainer typically used for?

A 6-inch Class 150 strainer is typically used in: cooling water systems for power plants and industrial facilities (cooling tower sump pumps, condenser water), municipal water treatment plant intake screens (raw water from reservoirs or rivers), fire protection systems (suction strainers for fire pumps), process water supply lines for refineries and chemical plants, and steam boiler feedwater pre-filtration. At 6-inch size, it is typically installed on pump suction lines, main header isolation points, and upstream of flow meters or control valves that require clean water.