User Manual

Hydraulic System UNIWRAP TIC
64 UNI-h-Kap4 11/04
Description of function:
No volume flow flowing,
the solenoid valves are not
actuated.
Due to the two pressure springs located at the face end, spool (1) is
positioned so (see figure) that port P is shut off.
Port B is sealed by non-return valve (2).
Raise wrapping table Solenoid coil (Y138) is actuated by the UNIWRAP electronics module and
moves spool (1) to the right.
Volume flow flows from channel P via the spool gap in front of the lock-up
valve unit non-return valve (734-2). Pressure is built up which:
- opens the lock-up valve unit non-return valve (734-2) and
- moves the piston (4) to the left.
The volume flow flows via port B and via the open lock-up valve unit non-
return valve (734-2) into the rod spaces of the hydraulic cylinders – the
wrapping table is raised.
Lower wrapping table Solenoid coil (Y137) is actuated by the UNIWRAP electronics module and
moves spool (1) to the left.
Volume flow flows from channel P via the spool gap in front of the lock-up
valve unit non-return valve (734-1). Pressure is built up which:
- opens the lock-up valve unit non-return valve (734-1)
(without importance here since port A is closed) and
- moves the piston (4) to the right.
The movement of the piston (4) to the right opens the lock-up valve unit
non-return valve (734-2). Port B (rod spaces of hydraulic cylinders) is
connected with the tank (T1) via the open lock-up valve unit non-return
valve (734-2) and the spool (1).