Dávkovací čerpadlo DC 50 / DC 200
I. USE
Dosing pump, series DC, is used for dosing liquid additives to a concrete flow at realisation
of dry-sprayed or wet-sprayed concrete technology.
The additive is used for increasing speed of the concrete hardening process, increasing the
resistance at low temperatures, etc.
The pump may be used in the environment with outside temperatures of +5 ÷ +35 °C.
The source of electric power from the network 3 x 400V / 50Hz must be available.
The source carrying the minimum pressure of 0.3 MPa shall be used as the pressured water
intake.
The equipment is designated for the environment free of any danger of a methane explosion
(SNM-0) and flammable gases according to the Czech National Standard (ČSN) EN 1127-2.
II. PRINCIPLE OF FUNCTION; DESCRIPTION
The basic unit of the pump is a hose pump providing for accurate dosage, easy maintenance,
dry-operation, long service life, etc.
The pump is driven by the electric motor equipped with the ballast resister permitting the
dosed quantity be mechanically controlled.
The pressure switch situated within the circuit provides for the pump automatic switch-off
and switch-on according to a rise or drop of the pressure caused by closing and opening the
closure on the spraying nozzle of the concrete spraying machine.
The system of a reverse valve avoids any leak of chemical liquid additive into the water
distribution branch.
The control (regulation) of the dosed quantity is carried out by change of rotations of the
pump rotor. The rotations are controlled at the driving shaft and the number of them is
transferred to a display on the converter showing the quantity of supplied liquid additives in
litres. The operating staff may operatively adjust the optimum dosage at various and
changing conditions of spraying, e.g. output of water at the place of spraying.
Distributions water section:
-closing valve (1) at the input with a quick coupler (2) for connection of the pressured
water
-reduction valve (3) for setting the input pressure –set at 0.55 MPa
-reverse valve (4) avoiding the access of a liquid mix to the distribution water section
-safety valve (5) set at 0.6 MPa
-
The mixing section (6) is connected to the water supply and rising branch from the hose
pump (7).
