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D846MGB -Rev. 04
11/14
This table describes the function of each element.
TABLE OF VALVE SETTINGS FOR 1 and 2-speed
HOMELIFT valve
SCREW
DESCRIPTION
SETTINGS
N.1
Maximum valve
pressure
calibration
Tighten to increase
maximum calibration
pressure.
Loosen to decrease
maximum calibration
pressure.
N.2
Low speed
setting
Tighten to increase low
speed
Loosen to decrease low
speed
N.3
Calibration of rod
counterpressure
and rope anti-
fleeting
Tighten to prevent the
rod descending alone in
an emergency
Loosen to enable rod to
descend alone in an
emergency
N.4
Stop valve test
If screw is tightened
completely the cabin
speed tends to exceed
nominal speed and
triggers the parachute
valve
N.5
Choke device for
deceleration from
high to low speed
(ascent and
descent)
Tighten to brake more
slowly.
Loosen to brake faster
N.6
Ascent speed
limiter
Tighten to reduce ascent
speed
Loosen to increase
ascent speed to
maximum pump
capacity
N.7
Choke device for
pressurising and
ascent start
Tighten to delay
pressurisation with
consequent gentle start-
up
Loosen to obtain
immediate
pressurisation with
rapid start-up
N.8
Descent speed
adjuster
1 speed
(2 SPEED)
1 Vel
– Unscrew to
increase the downward
speed
2 VEL
– Screw to
increase the downward
speed
N.9
Calibration of
hand pump
pressure
Tighten to increase hand
pump calibration
pressure
Loosen to decrease
hand pump calibration
pressure
Table 4
6
Maintenance, inspection, repair and safety
emergency
6.1
General points
The hydraulic components are not subject to heavy
wear, are safe and require little maintenance. In
order to obtain these results, the components must
be chosen carefully and be of the correct
dimensions and the oil must be appropriate to the
system features.
6.2
EM manual emergency valve
Also the seal of the hand push button is provided
by a sphere and can be compromised by dirt
entering between the seat and sphere. When the
emergency switch is actuated a jet of oil is noted
that should cease completely when the switch is
released. If this does not occur, there may be leaks
from the emergency valve but also leaks from the
solenoid valve EVD HDU, ( if installed ) which
discharges from the same point.
The following checks, including those of
point c) must be performed with pressure
inside the valve. Extreme caution must
therefore be exercised.
In order to check the seal of the emergency valve,
use the emergen
cy valve’s hexagon to unscrew
the emergency unit completely, dry off the oil
remaining in the hole and check that no other oil
escapes from the sphere (see 15).
Figure 75
If there are oil leaks from the sphere, it will
be necessary to replace the entire descent
block or carry out a repair as explained in
the next point.
EM
screw 3
