30
Tanco Autowrap 1300 EH
Operator’s manual
OTHER VALVES
"Closed / Open center" plug
= Valve V6-V7
Safety limit valve
= Valve S1, gate
Power limit valve for wrapping arm
= Valve S3
Stop limit valve for wrapping arm
= Valve S4
Regulating valve
= gate
13.4
WRAPPING ARM VALVE BLOCK.
The wrapping arm valve block is attached to the wrapping arm motor, and includes 4 valves.
These valves have carefully set in the factory and should not be tampered with.
When the wrapping arm starts, the oil pressure also goes to the brake so it is released. But we want a
little delay here to prevent a too hard stop when the brake goes on. This is obtained by the mounting of a
nozzle inside the fitting to the brake.
a)
Non return valve.
It shall prevent the oil going back to the control valve for wrapping arm speed. It is placed inside
the block, and can only be reached by removing the whole block from the motor.
b)
Safety valve on the plus side.
(S3, fig.13-2).
This valve shall provide a gradual stop of the wrapping arm and prevent accumulation of
pressure on the motor's outlet side when the arm stops. The valve lets the oil flow from the outlet
side of the motor to the input side.
c)
Safety valve on the minus side.
(S4, fig.13-2).
This valve limits the max. torque of the wrapping arm. The valve lets the additional oil over to the
motors' outlet side. It is adjusted so that the pull force on the far end of the arm is approx. 35 KG.
d)
Holding valve.
(S 1, fig. 13-2)
This valve regulates the oil flow on the outlet side to be able to hold a constant input pressure to
the wrapping arm motor. This makes the motor go smooth, and the brake is not activated even if
the wrapping arm rotates easy "downwards". (If the machine is in an angle while wrapping).
IMPORTANT: All these valves have been carefully set in the factory. Incorrect adjustment
of these may cause damage to the machine. Always ensure that trained personnel only adjust
the settings of these valves.
Fig. 13-2
