Ä More information on: Druckmessgerät D40 - D63 [WIKA]
4.2.4
Backflow preventer BA295S
The backflow preventer protects drinking water systems from back pressure, backflow and
reverse suction. The backflow preventer prevents process water or disinfectant solution
from the station from flowing back into the public mains water supply grid.
Fluids can be safeguarded up to fluid category 4 as defined in DIN EN 1717 in
conjunction with DIN 1988-100.
Ä More information on: Backflow preventer BA295S
4.2.5
Non-return valve PN40
Ä More information on: Non-return valve PN40
4.2.6
Metering pump DOSATec D25 RE 09
The quantity of chemicals metered is always proportional to the volume of
water, even if there are fluctuations in throughput and pressure.
Ä More information on: Metering pump DOSATec D25 RE 09
4.3
R&I flow chart
The R&I flow chart of the station can be found in the
The PN40 non-return valve's body consists of two screwed parts.
The DOSATec D25 metering pump is a hydromotor metering pump and is operated
with water pressure. The metering pump sucks in the concentrate, meters the desired
percentage and homogenises the solution in the mixing chamber with the driving process
water. The solution thus produced is then transported into the water pipe.
Functional description
Ä " Appendix" on page 92 .
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MAN048969, Ver. 5-05.2024