Putzmeister 210109379, Operating Instructions Manual

Page: 101 / 434

Generaltechnicaldescription
313
AP02_004_1211EN
The Stransfer tube(5) is built into the hopper on the pump. Its wear
ring locates against the spectacle wear plate. Its other end is fitted in
the pressure connection(6) to which the delivery line is connected.
The transfer tube(5) is switched across by two switch cylinders.
The water box(2) is fitted between the drive cylinders and the
delivery cylinders. The water in the water box performs the following
functions:
− it cools the delivery pistons and the piston rods;
− it rinses the inner wall of the delivery cylinders.
The returning delivery piston sucks the medium in from the hopper.
At the same time, the advancing delivery piston forces the medium
which has previously been sucked in through the transfer tube into
the delivery line.
At the end of the stroke, the pump switches over, i.e. the transfer
tube is swung in front of the full delivery cylinder and the delivery
pistons reverse their direction of movement.
Reversal of the delivery pistons’ direction in the middle of the stroke
movement. The transfer tube switches over. The medium is still
pumped without interruption. Changing the stroke over helps prevent
the formation of a blockage.
The delivery pistons reverse their direction during the stroke move
ment for reverse pumping. The transfer tube does not switch over so
the pump now runs in reverse. The medium is sucked from the deliv
ery line and pumped back into the hopper and the pressure in the
delivery line is dumped.
S transfer tube
Water box
Pumping
Change-over
Reverse pumping