Midilift SL
Installation Guide
October 2016
Version 9
24
4.3
Rupture valve adjustment
Checking and adjustment of the Rupture Valve
Remove the ram from the lift and lay it on the floor. (See Midilift SL maintenance manual for
removal of ram procedure).
Remove the rupture valve from inside the ram. This can be done by inserting pins in the
holes and turning. The valve is generally only finger tight.
Using feeler gauges, check the gap of the valve. The gap should be set to:
Lifts with rated speed of 0.08m/s:
•
2.1 and 3.1
m
Rams =
0.575
mm
±0.025
Lifts with rated speed of 0.15m/s:
•
2.1 and 3.1
m
Rams =
1.1mm
±0.05
•
3.5, 3.8, 4.1, 4.4, 4.8 and 5.1
m
Rams =
1.1mm
±0.05
•
Stage Rams =
1.25
mm
±0
Note - The gap tends not to be uniform around the valve, so set the gap to an average.
Replace the valve back into the ram base and screw in until finger tight. - DO NOT
OVERTIGHTEN.
Re-install the ram back into the lift.
Run the lift up and down a couple of times before re-checking the operation of the rupture
valve.
In the event of the valve not working, the valve gap will need to be reduced by 0.1mm
increments until the correct operation is achieved.
With the rupture valve working correctly, check that with full load on the platform the
valve does not operate during normal running of the lift.
gap
