High Pressure System (Option Code Hp) - Dellmeco DM 08/10 Instruction Manual

16.7 High Pressure System (option code HP)

DELLMECO diaphragm pumps can be fitted with High Pressure option. It is a very compact unit that can be
mounted directly to the filter press. It has been designed for charging filter presses with chemical wastes and special
sludge. An extern pressure booster doubles or quadruples the delivery pressure.
Filter presses with DELLMECO HP pump
Automatic adaptation
When slurry is transferred to a chamber filter press, first the chambers get filled while the pressure tends to zero.
Under the increasing filling-level the solids assemble at the filter cloths. This requires a pressure that continuously rises
with the increasing content of solids. Under a constant flow quantity the pressure would rise extremely fast.
The drive of the HP pump by compressed air causes a diminution of the flow quantity according to the increasing
counter-pressure in the filter press. This produces a soft filtration curve, automatically self-regulating according to the
filling level of the filter press. This is independent from the properties of the slurry. No pressure tank nor pressure
transmitter nor speed control are required. The complete HP pump works without electric energy.
End of filtration process
When the filter press is filled with the solids so far that no more slurry can be taken up, the pressing period is
terminated. The air operation of the DELLMECO pumps then reduces the flow rate to zero while the outlet pressure
holds the required level compressing the filter cake. Excellent results in drying are obtained. At the end of the pressing
period the pump simply stops.
Pressure adjustment
The required pressure in the filter press is comfortably adjusted by the height of the air pressure supplying the
charging station. For a required pressure of 12 bar the HP pump has to be supplied with 6 bar when the pump with a
pressure transmission of 1:2 is applied. In the case that higher pressures are necessary or there is only a lower air
pressure available, the HP pump with 1:4 transmission is applied.
Low air consumption
The charging stations needs the maximum air quantity only during the filling period. The more the press is filled, the
more slowly the pump works. So the air consumption slowly reaches zero during progressing filtration.
Appearance and dimensions of high pressure system (pump with HP option)
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38 I DELLMECO I AODD DIAPHRAGM PUMPS
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