DUPLEX FILTER F311 Application The Duplex Filter F311 is a multi-purpose filter for liquid media. It is characterized by continuous operation during the cleaning phase as well as a high degree of filtration down to very low microns. As a special feature, the maintenance and strainer access can be optimized by choosing different filter cover solutions. The degree of contamination can be optionally monitored with various differential pressure indicators. Further options, for example magnetic inserts or the sacrificial anode enable an application-specific customization. Function The Duplex Filter consists of two single filters which are connected via a flanged switch-over device (A300) and can be operated alternately or in parallel. The filter size DN65 has an integrated switch-over device. The standard filter design consists of a cast housing and a cover which is fixed either with a clam bloc, lever lock or with stud bolts and nuts. Venting devices in the covers and draining devices in the housing are included in the scope of supply. The filter is equipped with a basket or ring-type strainer. The medium to be filtered flows through the strainer from the inside to the outside. The strainer is made out of a perforated plate which can be covered optionally with mesh in different mesh sizes. A rotary vane is used to switch between the filters which ensures an easy changeover even for the larger filter sizes. In case the filter is installed on the suction side, the rotary vane shall be equipped with a lock. Technical Data In- / outlet: Operating medium: Volume flow: Design pressure: Basket strainer Ring-type strainer 80 – 1000 µm (fabric / perforated plate) 10 – 60 µm ≥ 1 mm (perforated plate) acc. customer’s specification Cover with clamp lock (type F311-BÜ) Cover with lever lock (type F311-HE) Cover with stud bolts and nuts (type F311-S) Ball valve; Screw (brass) acc. customer’s specification Ball valve; Valve (brass) acc. customer’s specification Flange acc. DIN EN 1092-2 acc. customer’s specification Grade of filtration: Filter cover: Drainage: Ventilation: Connection: Materials Cover gasket: Strainer (perforated plate / fabric): acc. customer’s specification EPDM, FPM, PTFE, MTQ .4571, 1.4571 / 1.4401, brass / Bronze, Hastelloy C4 Surface Treatment Housing inside: Corrosion protection primer Epoxy coating, Housing outside: Options Differential pressure indicator (optical / electrical), sacrificial anode, filter support, magnetic insert Further options and customer specific solutions are available upon request.

Flow capacity BS = Basket strainer RS = Ring-type strainer Larger filter sizes, higher operating pressures as well as further customer specific designs and features are available upon request. The above mentioned flow capacity is valid for inlet velocities of 2,5 m/s in pressure pipes, a viscosity of 1 mPas (water) and a grade of filtration ≥ 80 µm. For suction pipes we recommend half of the above mentioned flow capacity values.