F311 High Flow Duplex Strainer

F311 duplex strainers provide uninterrupted flow capability from 30 –  635 m3/h. Flow can be switched by using a lever, allowing for easy maintenance. F311 duplex basket strainers are supplied in cast iron (GG-25, GGG-50) with corrosion protection. Mesh baskets are available in Carbon Steel or Stainless Steel,  micron ratings from 20 – 3000 micron.  

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Duplex basket strainer 
Model F311-BU (Clamped)
Model F311S (Stud bolts)
Model F311-HE (Lever lock)

DN65 – DN300

Flow rate
30 – 635 m3/h

Design pressure
6 bar, 10 bar, 16 bar

Materials (Body & lid)
F311-BU: GG-25/GGG-50
F311S: GG-25/GGG-50
F311-HE: Steel

Materials (Basket)
F311-BU & F311S: Steel, Steel/1.4401,1.4301, 1.4301/1.4401
F311-HE: 1.4571/1.4401, Hastelloy C4

Surface treatment 
Inside:  Primer or epoxy resin
Outside: Synthetic enamel RAL 5018, turquoise

Filter closure
Model F311-BU (Clamped)
Model F311S (Stud bolts)
Model F311-HE (Lever lock)

Basket micron ratings
20 – 3000 micron

Connection type

PED compliance
GROUP 2 Liquids