D860MGB rev04
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2) Use some thick rubber to isolate both the cylinder head from its fixing collar and the cylinder bottom
from its support.
3) To connect the pump unit to the cylinder use a piece of flexible hose placed near the pump unit
which has to be at least 5/6 meters long.
4) Add some oil in the tank up to the maximum level allowed.
5) Make sure that the pipe discharging oil from the valve to the tank, always discharges under the tank
oil level.
6) Check that there is no air in the oil.
6.10
MANOMETER SHUT-OFF
The manometer, which is placed on the valve group, is supplied with an exclusion shut-off. During the
regular working of the lift, the manometer shut-off has to be perfectly closed to avoid possible oil losses or
damage to the manometer itself.
7 ADJUSTING AND TEST OF THE OMARLIFT RUPTURE VALVE
7.1
GENERAL INFORMATION
-
The rupture valve is the hydraulic parachute assembled on the cylinder. It operates against the free
fall or the down travel with an excessive speed.
-
The rupture valve has to be capable to stop the car during the down travel and keep it still, when the
downward speed exceeds the nominal speed +0,3 m/s at the latest.
-
Practically it is possible to fix a speed increase corresponding to 30% of the nominal speed. This
value covers all the applications until the max admitted speed for hydraulic installations: 1 m/sec.
-
The car speed changes with the variation of the oil which goes through the valve: adjusting a valve
means limiting the passage to a minimum value which lets an oil quantity, lower than the adjusting
value, run free and blocks the oil flow when the adjusting value is reached.
For the calibration procedure, the appropriate manufacturer's manual.
7.2
TEST AND WORKING OF THE RUPTURE VALVE
a)
Get the travel shaft free and be sure that the whole lift equipment is perfectly working.
b)
Load the car with the nominal load and take it to the upper floor.
c)
Activate the test parachute valve (VP) of the inverter.
d)
Make a travel from the upper floor to the lowest one.
e)
The car speed increases up to exceeding the nominal speed..
f)
The rupture valve intervenes when the downward speed increases by 30% about with respect to the
nominal speed. As a result, the car decelerates up to stop.
g)
If, after some-meter run at a speed higher than the nominal one, the rupture valve has not
intervened, stop the car pushing button "STOP"..
h)
The trial function VP is automatically disabled after each test. To repeat the trial restart from point C.
i)
When the test has finished, block the regulation screw with the lock nut and seal with red paint or link
the two proper holes, one located on the screw and the other on the valve block, with iron wire and plumb.
8
VALVE GROUP AND INVERTER’S PARAMETER CALIBRATION AND
ADJUSTMENT
8.1
GENERAL INFORMATION
The valve group is adjusted and tested in the factory together with shut-off valve, motor pump group and
inverter. When the regulation has been completed, a diagram is prepared which reproduces the speed
behavior during upward and downward travels. This diagram (see Figure 10) is supplied together with its