RUPTURE VALVE VC 3006 - types A*,B,R,G,E*
This device consists of a valve which stops (completely or partially) the oil flow when downward speed exceeds the
preset value. This device ensures a deceleration lower than g
n
(9,81 m/s
2
).
These 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:
Q
i
=
where:
Q
i
= maximum tripping flow of the valve [l/min]
V
d
= rated downward speed of the car [m/s]
A
= ram area [cm
2
]
N
vc
= number of jack connected to the rupture valve
c
m
= reeving ratio (1 for direct installation 1:1,2 for indirect installation 2:1)
- 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
(es: VC 3006/B 1"1/4; Qi = 150 l/min; X = 9mm)
- 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 rupture 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 this 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.
(*) not certified
Table 1 - area for single ram jacks
ram
HL 55
HL 65
HL 75
A [cm
2
] 28,26 38,46 50,24
ram
50
60
70
80
90
100
110
120
130
140
150
180
200
238
A [cm
2
]
19,63
28,27
38,48
50,27
63,62
78,54
95,03
113,10 132,73 153,94 176,71 254,47 314,16 444,88
Table 2 - equivalent area for telescopic jacks with hydraulic synchronization
jack type
T42
T50
T63
T70
T85
T100
C2 (2 stages)
A [cm
2
]
21,14
29,40
44,22
59,59
84,94
117,61
C3 (3 stages)
33,25
44,04
66,63
88,83
132,27
176,15
Table 3 - equivalent area for telescopic jacks with mechanical synchronization (by chains)
jack type
TCS/EC 60
TCS/EC 75
TCS/EC 90
TCS/EC 105
TCS/EC 120
-2N, Y (2 stages)
A [cm
2
]
36,76
54,55
75,87
100,73
129,12
-3Y (3 stages)
45,95
65,50
88,59
115,22
*****
-4Y (4 stages)
56,32
77,64
102,50
*****
*****
V
(
d
1 3
)
6 A N
vc
⋅ ⋅ ⋅
,
⋅
c
m
--------------------------------------------------------
INSTRUCTION FOR
RUPTURE VALVE SETTING
table :
date :
06.005
revision :
page :
D
19/01/1998
1/3
09/11/2017
