Rain Bird HDF 1X2, User Manual

Page: 7 / 21

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4.2 Backflushing Phase
Through the feeding of the three-ways valves
chamber, the inlet of water to the filter closes,
beginning the inner of the filter with the drainage
manifold, thus starting the backflushing cleaning.
The filtered water given by the Special backflushing T,
is introduced in the filter.
The available hydraulic power is used to overcome the
pressure exerted by the spring on the discs stack,
generating a decompression due to the piston
displacement (raising).
The release of the discs creates rotation due to the
tangential projection of the water coming from the
feeder bars which at the same time are used as a
structural shoulder for the discs stack.
The end of the backflushing coincides with the closure
of the drainage outlet and the opening of the outlet
manifold, allowing water coming from the feeder
manifold to come into the interior of the filter. This
allows the systems to re-establish the filtration phase.