The Kleerflo self-cleaning filter is designed to remove suspended solids from water utilising an integral backwash system. It can be supplied in a wide range of pipeline sizes, flow rates and element apertures.
A unique control system, which can be electrically or pneumatically operated, allows for automatic backwashing of the filter elements. The backwashing cycle can be initiated by pressure differential, by a timer, an external command or manually. Actuation for backwashing can be achieved utilising either compressed air or the water line pressure where this is above 200kPa. (2 Bar)
Principle of Operation (Click Here for Diagram)
Contaminated water entering at the filter inlet is allowed
to pass freely through the tubular filter elements (B),
which consist of stainless steel inverted wedge wire wound
spirally onto support bars and with a pitch that defines
the aperture & hence the size of suspended particles that
are retained. The filtered water exits at the outlet flange.
When the filter is dirty, water flow is restricted and the
pressure differential `between the inlet & outlet increases.
By fitting a differential pressure switch, which is fed from
both inlet & outlet pressures, the degree of dirt in the filter
can be determined. A micro-switch energises the control system
which automatically backwashes the filter elements.
Backwash is achieved by simultaneously sealing the water inlet
to the filter element (A) & opening the top of the element to
the backwash outlet. This causes a reversal of flow on the
element being backwashed with filtered water from the other
element(s) passing from the outside to the inside of the
element lifting the contaminate & discharging it through the
backwash outlet to atmosphere. After a pre-set time the
element is re-opened at the inlet and sealed at the backwash
Kleerflo Automatic Self-cleaning Filter
'Kleerflo' - Self-cleaning Filter
Click here to view Operation
On completion of this operation the control system causes the backwash operation to be carried out on each of the other filter elements with a suitable dwell period between each element backwashing to allow for system recovery. A minimum of two elements is always fitted into a filter so that during backwashing a minimal flow loss is achieved.