LRV-1 lift control valve
1 General, product description
13/86
300-I-9010050-E-28/02.2012
1.6.3
Factory settings
All valves are factory-set to the values for the particular installation and
then tested.
S
Pressure-relief valve set to the maximum working pressure
S
Bypass pressure as per the calculated minimum static pressure
S
Emergency-lowering valve set to 5…10% of maximum DOWN
speed
S
Mechanical zero point of the feedback sensor
1.6.4
Description of function
The lift control valve can be subdivided into 3 main functions.
1. UP section / pressure-relief valve
4
1
16
S
Initial position:
UP spool (
16
) is open in the 0 position; pump flow goes directly to
tank
S
Up travel / acceleration:
UP spool (
16
) is progressively closed by the electro-proportional
valve (UP solenoid); this results in smooth acceleration of the lift up
to maximum speed
S
Deceleration:
UP spool (
16
) is progressively opened by the electro-proportional
valve (UP solenoid); this results in smooth deceleration of the lift to
standstill
S
Overload:
pressure-relief valve (
4
) and UP spool (
16
) open when the maximum
working pressure set with screw (
1
) is reached