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4.2
Function
The fine filter consists of an upper part and a combined lower part. In the
operating state "Filtration", the small upper filter is closed so that the water
can only flow through the main filter from the outside to the inside.
When the ball valve for "Backwashing" is opened, the filter is pressed down
until the water supply to the outside of the main filter is interrupted. At the
same time, the water flow through the upper filter is opened. The water
required for cleaning the filter flows through the upper sieve, the rotating
impeller and the main filter from the inside to the outside. This ensures effec-
tive cleaning of the filter across the entire surface of the sieve at full inlet pres-
sure. When the ball valve is closed again, the filter automatically resumes
normal operation.
The integrated pressure reducer operates on the basis of a force comparison
system. This means that the force of a spring counteracts the force of a dia-
phragm. The inlet pressure neither acts in the opening nor in the closing
direction. Therefore, pressure changes at the inlet pressure side do not affect
the outlet pressure.
4.3
Approvals, conformities, certifications
The product is DVGW-certified; the registration number are:
•
NW-9311AT2316 (WAF 04 R)
Product description
WAF 04 R
EN
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