1 0991 491
EN
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23.08.2016
1.00
ENG
NGV-EK
V
ALVE
M
ANUAL
I
NSTALLATION
,U
SE AND
M
AINTENANCE
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1.2
LA SCHEDA NGV-EK01
The NGV-EK01 card
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Is designed for applications where you can not install a power unit with
a standard NGV A3 valve and in particular for those installations
where the interface with the control panel is typical of a power unit
with the 3010 valve or similar.
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Is particularly suitable in event of restructuring, modernization and / or
where the control panel, born to operate with a power unit with 3010
valve or similar, it is not suitable to be used with a standard NGV-A3
valve.
The NGV-EK01 card, also
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Can be extended with an additional device in order to manage the
uncontrolled movement of the car (amendment A3).
The NGV-EK01 card coupled to a power unit with NGV-EK valve, is
advantageous because :
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Can be installed on any system in which the control panel, both
existing and new, does not meet the requirements to control of a
power unit with standard NGV-A3 valve.
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interfaces itself with the control panel only using terminals and do not
requires changes to the electrical/working schema
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the absorbing power is less than two solenoid and does not require
changes to the control panel.
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the use of a bypass valve that allows the starting of the motor-pump
with the VB spool closed, makes easier the interfacing with the control
panel.
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Indicates the alarm status via a single relay contact (exchange
contact).
1.3
IL FLUIDO
GMV use and recommend an hydraulic fluid ISO VG 46 that :
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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.
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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.
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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.
1.4
HOW THE NGV EK WORKS
The NGV valve is made with a non-return valve VR, a control spool VB controlled by a stepping motor and by
a system with pilot operated non-return valve VRP - P(moved in opening by the electro-valve VMD).In case of
uncontrolled movement the P spool operates to avoid the lift downward
Valve VR
It is a valve that prevent , during the downward, the oil inlet to the pump.
It forces the oil coming from the VRP C2 to pass through the spool VB and then in the C3 and in
the tank T1.
Valve
VRP-P
It is the pilot operated non-return valve, requested by rules.
During upward the valve works only as ON/OFF, the spool VRP opens or closes depending on
the oil that comes. Its position is determined by the ratio between the pressure that develops in
the chamber C2 and the one that occurs in chamber C1
During downward, instead, it opens the oil way to the valve block (chamber C2). Its opening is
made by the pushing of the piston P that is opened by the pilot
operated VMD valve
Spool VB It’s the main part of the control block.
It adjusts the oil quantity that should be discharged and determines all the movements of the car
Its movement is controlled by a stepping motor coupled to the spool VB, through a screw-nut
coupling (necessary to transform the rotatory motion into translatory).
The spool adjusts both the upward phase (with a direct control of the oil that should be
discharged and, indirectly the oil for the cylinder) than that of downward (directly)
Valve
VBP
This solenoid valve controls the fluid flow from the motor-pump towards the valve, and
consequently towards the piston. The VBP, when de-energized deflects the flow in exhaust,
