Hydraulic installation
Hydraulic accessories
25
© Lutz-Jesco GmbH 2014
Subject to technical changes.
140725
BA-10103-02-V01
Stepper Motor-driven Diaphragm Dosing Pump
MEMDOS SMART LK
Operating instructions
햲
햳
햴
햷
햶
햹
햺
햵
햸
Fig. 21: Installation with pressure relief valve – returning to the dosing tank
No.
Description
햲
Main line
햳
Injection nozzle with shut-off valve
햴
Pressure-relief valve
햵
Dosing tank
햶
Pressure line
햷
Dosing pump MEMDOS SMART LK
햸
Wall bracket
햹
Shut-off valve
햺
Suction line
Tab. 13: Designation of components
8.7.4 Back-pressure valve
Back-pressure control valves are necessary if:
there are considerably fl uctuating system pressures,
the pressure on the suction side is higher than on the discharge side
or if you intend to carry out dosing into depressurized lines.
In cases like this, if you do not use a back-pressure valve, imprecise
dosing results will occur or overloading will result. The back pressure
valve solves these problems by generating a defi ned, constant back
pressure.
In some circumstances, a back pressure valve is unnecessary if you use a
hose injection nozzle and if the back pressure that it generates is
adequate.
햲
햳
햴
햷
햵
햸
햺
햶
햻
햹
Fig. 22: Installation with a back-pressure valve
No.
Description
햲
Main line
햳
Injection nozzle with shut-off valve
햴
Back-pressure valve
햵
Pressure-relief valve
햶
Dosing tank
Tab. 14: Designation of components