ENG
1 0991 486
EN
-
29.09.2016
6 / 11
DLV
VALVE MANUAL
I
NSTALLATION
,
U
SE AND
M
AINTENANCE
GMV use and recommend an hydraulic fluid ISO VG 46 that :
• Thanks to classification as category HEES, as rule ISO-UNI 6743-4 and its
biodegradability index > 90%, according to standard CEC L33-A-93, is
acceptable from an environmental point of view.
• Thanks to the synthetic base (ISO VG 46 ) and its viscosity index (>140),
higher than the traditional mineral oil, allowing greater stability, ensuring
better performance against wear and aging on systems as lifts for
persons and goods, in accordance with the environmental directive
2006/118/EC.
• Thanks to a flash point above 220°C compared to the 140°C of the
traditional mineral oil it is safer and reduces the risk of fire.
1.5 CLEANING AND SAFETY PROTECTIONS
Ensure there is no dirty inside.The impurities could damage the sealing of the piston and of the valve block and
can cause failures.All the components to remove for control and repair,should be clean before the re-
installation.
Any leakage of fluid should be adsorbed with rags during the maintenance to avoid any release.
2 DLV A3 WORKING DESCRIPTION
2.1 DESCRIPTION
The DLV A3 is a pilot-operated downward non-return valve,normally closed,primarly made by an aluminium
body.
The F side must be connected to the primary valve.The H side must be connected to the ball valve and then to
the jack (see pict. 2 in sect.).Here below is shown the flow upward
Pict 1
So let’s see what must be done during the normal working of the lift :
Upward:If the DLV A3 works as a standard non-return valve opening by the oil pressure,nothing is requested.
Downward:the valve DLV A3, has two working ways:
1. Contemporaneous
The DLV A3 is energized and de-energized at the same time of the main downward solenoid valve VMD.
In this way both valves are working as hydraulic valves in series and they require to be monitored. The
monitoring requires the type examination certificate. This monitoring must be done once a day by performing
(automatically)a specific sequence of actions.
[F] IN
[H] OUT
To Next Page
Loading...
