GMV VC 3006 Instruction

This device consists of a valve which stops (completely or partially) the oil flow when downward speed exceeds the
preset value. This device ensure a deceleration lower than g
This valves are designed and manufactured to a safety factor greater than 1,7 with respect to the proof stress
(non-proportional elongation) calculated on a pressure 2,3 times the maximum static one (45 bar).

SETTING OF THE RUPTURE VALVE:

- Calculate the tripping flow with the following formula:
⋅ 1,3 ) ⋅ 6 ⋅ A ⋅ N
(
V
d
=
Q
i
c
m
where:
Q = maximum tripping flow of the valve [l/min]
i
V = rated downward speed of the car [m/s]
d
2
A = ram area [cm ]
N = number of jack connected to the rupture valve
vc
c = reeving ratio (1 for direct installation 1:1, 2 for indirect installation 2:1)
m
ram 50 60
2
A [cm ] 19,63 28,27
Table 2 - equivalent area for telescopic jacks with hydraulic synchronization
jack type
C2 (2 stages)
A [cm
C3 (3 stages)
Table 3 - equivalent area for telescopic jacks with mechanical synchronization (by chains)
jack type
-2N, Y (2 stages)
A [cm
-3Y (3 stages)
- Remove the cap from the adjusting screw and untight the locking nut.
- Screw the adjustment screw in to stop and measure the quote Xo (valve completely closed).
- Read on the diagram for valve setting the quote X with respect to the tripping flow and to the valve dimension
(e.g.: VC 3006/B 1"1/4; Q = 150 l/min; X = 9mm)
i
- Screw out the adjustment screw to obtain the requested quote X + Xo

CHECKING OF THE RUPTURE VALVE:

- Call the car with full load to the top floor.
- Tight screw #5 to stop and call the lift back to the bottom floor.
- When the lift reaches the downward speed according the tripping flow, the rupture valve closes and the car stops.
In case of ruture valve with by-pass, the car will continue to descend with low speed. If the valve does not close it is
necessary to re-adjust it:
- Untight the locking nut and screw in the adjustment screw one turn.
- Call the lift to the top floor and then back to the bottom floor.
- Repeat these operation until the valve closes.
- Screw out #5 to stop and be sure the valve does not trip during a normal down travel.
IMPORTANT!!!
Once the check is done re-assemble the cap on the adjusting screw.
INSTRUCTION FOR
RUPTURE VALVE SETTING
RUPTURE VALVE VC 3006 - types A, B, C, E, G, R
vc
Table 1 - area for single ram jacks
70 80 90
38,48 50,27 63,62 78,54
T42 T50
21,14 29,40
2
]
33,25 44,04
(TCS/EC 45) TCS/EC 60
(22,50) 36,76
2
]
(29,93) 45,95
2
(9,81 m/s ).
n
100 110 120 130
95,03 113,10 132,73 176,71 254,47 314,16 444,88
T63 T70
44,22 59,59
66,63 88,83
TCS/EC 75 TCS/EC 90
54,55 75,87
65,50 88,59
data sheet : 06.005 - 1/2
date : 14.01.1998
150 180 200 238
T85 T100
84,94 117,61
132,27 176,15
TCS/EC 105 TCS/EC 120
100,73 129,12
115,22 *****