Lutz-Jesco MEMDOS SMART LK, Руководство по эксплуатации

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Hydraulic installation
Hydraulic accessories
28
© Lutz-Jesco GmbH 2014
BA-10103-02-V01
Stepper Motor-driven Diaphragm Dosing Pump MEMDOS SMART LK Operating instructions
8.7.8 Dosing of suspensions
When dosing suspensions, the dosing head must be rinsed regularly to
prevent depositing. To do this, you install a feed line for the rinsing
medium (water) in the suction side installation.
햲
햳
햶
햹
햴
햻
햵
햺
햸
햷
Fig. 26: Dosing of suspensions
No. Description
햲
Main line
햳
Injection nozzle with shut-off valve
햴
Pressure line
햵
Dosing tank
햶
Dosing pump MEMDOS SMART LK
햷
Wall bracket
햸
Suction line
햹
Shut-off valve
햺
Shut-off valve
햻
Line for rinsing the dosing head
Tab. 18: Designation of components
8.7.9 Suction pressure regulator
A suction pressure regulator may be necessary if the suction-side
installation of the system demonstrates a varying suction pressure or
supply pressure:

Dosing pumps that are installed above dosing tanks deliver less as the
tank empties, since the suction head increases.

Dosing pumps that are installed below dosing tanks deliver less as the
tank empties, since the positive delivery pressure reduces.
Further problems that can occur:

Greater wear on the dosing pump, e.g. diaphragm rupture due to the
effects of heavy forces with particularly high tanks and high-density
dosing media.

Idling of the dosing tank in the case of a diaphragm rupture or pipe
breakage.

Impermissibly high forces in the pump transmission that occur when
dosing pumps receive the dosing medium directly from the pressure
line.

Reduced performance or destruction of fi ttings due to cavitation with
long suction lines.
Installing a suction pressure regulator is a remedy for the problems
above. The suction pressure regulator is opened by the dosing pump's
suction pressure. This ensures that no dosing medium can fl ow if the
dosing pump is not running or no vacuum can be generated following a
pipe fracture.
Notes on assembly:

When using a large suction pressure regulator, you should provide a
pulsation dampener on the suction side.
햲
햳
햶
햴
햸
햵
햷
햹
햺
Fig. 27: Installation with a suction pressure regulator