C
−
LRV lift control valve
Product description
300−I−9010212−E−10/08.08
1.3.2
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
Mechanical null point of the feedback sensor
S
Emergency−lowering valve set to 5−10% of maximum DOWN speed
1.3.3
Description of function
The lift control valve can be subdivided into 3 main functions.
1. Up section / pressure−relief valve
4
16
1
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
