Counter Balance Valves 7AVB
Rev. 2 3.4.1
HYDRANOR
COUNTER BALANCE VALVES 7AVB
GENERAL DESCRIPTION
Figure 1 7AVB General Arrangement
The Counter Balance Valves 7AVB are seawater resistant load control valve. The valves are
designed for applications used in lowering operations and have the following characteristics:
Delivered as single valve or with check valve for free flow.
Delivered with sub plate with threaded ports, SAE flanges or for gasket mounting to a
valve unit.
Adjustable pilot pressure.
Delivered with flow capacity up to 650 l/min. (Version for 900 l/min will soon be
available)
For more details about types and options, please refer to section ’Modular Code’.
Counter Balance Valves 7AVB
Rev. 2 3.4.2
HYDRANOR
MODULAR CODE
Options
Remarks
Design Code
Fill in
Mounting
7AVB
SUB Plate
Single Valve
Threads
With check valve for
free flow
T
Flanges
U
SUB Plate
V
Adjustable pilot pressure
No options
1
1
Size
10 mm
150 l/min
2
20 mm
450 l/min
4
30 mm
650 l/min
6
Stabilize pilot pressure
Fixed nozzle
Adjustable throttle valve
1A
Drain
External drain connection
No options
L
L
In example a 7AVB valve with sub plate (the valve has check valve for free flow) 650 l/min
flow, adjustable throttle valve and external drain connection will have modular code:
7AVBV161AL.
7AVB1*1AL 7AVB1*L
7AVBT1*1AL 7AVBT1*L
Counter Balance Valves 7AVB
Rev. 2 3.4.3
HYDRANOR
DIMENSIONS
T P L
T
P
L
M
MS
Figure 2 7AVB Dimensions (Sub plate version)
7AVB:
Size [mm]
A
B
C
F
H
L1
L2
P1
P2
Q
Q1
10
85
30
200
64
60
33
72.5
18
62.5
8
-
20
104
30
242
84
80
43
92.5
25
74
10
32
30
143
30
281
114
110
58
130
33
102
15
31
Q2
S
S1
S2
T1
T2
X
Z
B2
F2
M/MS/S
10
70
52
32
-
42
39.5
25
9
36
99
¼” BSPP
20
85
70
40
89
55
47
45
9
44
119
¼” BSPP
30
121
95
41
127
77
77
58
60
17
44
139
¼” BSPP
Counter Balance Valves 7AVB
Rev. 2 3.4.4
HYDRANOR
T
L
P
T P L
M
MS
S
S
MS
Figure 3 7AVBT Dimensions (Thread port version included free flow checks)
7AVBT:
Size [mm]
A
B
C
D
F
G
H
L1
L2
P1
20
104
30
241
128
159
75
80
73
98.5
40
30
143
30
280
175
208
94
110
105
153
56.5
P2
Q
S
T1
T2
X
Z
B2
F2
20
81
9
119
97
48
45
9
44
119
30
107
12.5
162.5
118.5
56
60
13
44
139
Counter Balance Valves 7AVB
Rev. 2 3.4.5
HYDRANOR
S
MS
T P L
M
MS
S
Figure 4 7AVBU Dimensions (SAE 6000 version included free flow check)
7AVBU:
Size [mm]
A
B
B2
C
D
F
F2
G
H
L1
L2
30
143
30
44
280
175
224
139
110
110
105
153
P1
P2
Q
S
T1
T2
W
X
Y
Z
30
46
100
12.5
162.5
129
71
32
60
67
13
Counter Balance Valves 7AVB
Rev. 2 3.4.6
HYDRANOR
T
L
P
T P L
M
MS
S
S
MS
Figure 5 7AVBV Dimensions (Sub plate version included free flow checks)
7AVBV:
Size
[mm]
A
B
B2
C
D
F
F2
G
H
L1
L2
P1
20
104
30
44
241
87.5
140
119
56
80
43
76
25
30
143
30
44
280
125
194
139
80
110
58
112
33
P2
Q
Q1
Q2
S
S1
S2
T1
T2
X
Z
20
57.5
10
15.5
23.5
70
68.5
72.5
55
30,5
45
9
30
84
15
13
23
95
103
109
77
40
60
17
Counter Balance Valves 7AVB
Rev. 2 3.4.7
HYDRANOR
TECHNICAL DATA
Description
Symbol
Data
Max. operating pressure in port P, A, B, T
P
max
350 bar
Max. pressure in port L (always in use)
L
max
10 bar
Test Pressure
P
420 bar
Hydraulic fluid
Mineral oils for hydraulic system
Viscosity range:
v
10 to 350 mm
2
/s (cST)
Viscosity index:
VI
120
Filtration, recommended filter with 20 100
Class 9 according to NAS 1638,
18/15 according to ISO 4406
Fluid temperature range:
T
-20 C to + 70 C
Ambient temperature range
T
-20 C to + 50 C
Standard Body Material
EN-GJS-400-15 (GGG 40)
Standard O-rings
Nitrile shore 70
Flow and Weights:
Size
Flow
Weight
10 mm
150 l/min
3.5 kg
20 mm
450 l/min
6.5 kg
30 mm
650 l/min
13.6 kg
Counter Balance Valves 7AVB
Rev. 2 3.4.8
HYDRANOR
Interfaces:
7AVB(T)(V):
Size
Threads
MS/M/S
Screws
Tightening
Torque [Nm]
10 mm
½” BSPP
¼” BSPP
4 off M 8 – DIN 931
20
20 mm
1” BSPP
¼” BSPP
4 off M 8 – DIN 931
20
30 mm
1 ½” BSPP
¼” BSPP
4 off M 16 – DIN 931
80
O-rings (Sub-plate versions)
Size [mm]
10 mm
4 off
1 off
15.08 x 2.62
9.92 x 2.62
20 mm
4 off
1 off
22.20 x 3.00
9.92 x 2.62
30 mm
4 off
1 off
31.34 x 3.53
9.92 x 2.62
7AVBU:
Screws
Size
MS/M/S
SAE Flanges
8 off M 14
30 mm
¼” BSPP
1¼” SAE 6000
Counter Balance Valves 7AVB
Rev. 2 3.4.9
HYDRANOR
INSTALLATION
The Counter Balance Valves 7AVB have a sub plate and are connected to the pipes as
follows:
7AVBT - Threaded ports
7AVBU - SAE 6000 flanges
7AVBV – Valve unit
Please refer to ‘Interfaces’, for details about connections, flanges and screws.
OPERATION
Opening pressure adjustment.
Install pressure gauges for measuring of pilot pressure and flow, and turn the hexagon screws
until the requested pressures is achieved. Clockwise rotation increases the pilot pressure.
Recommend opening pressure is 40 bar or higher.
MAINTENANCE
Visually check the valve. If required, paint unpainted (damaged) areas.
STORAGE
If storage longer than 6 months is expected, the valve must be kept in a dry room, free from
dust and protected against sudden large temperature variations. For storage longer than 12
months, the valve must be filled with inhibition oil. Before use check all visible seals and
flush with clean oil.
MARKING
Inlets and outlets are marked, refer to figure in section ‘General Description’.
