CB - Counterbalance Valves
Counterbalance Valves Catalog
CB - 18
11141737 • Rev AB • November 2013
OPERATION
APPLICATIONS
SPECIFICATIONS
SCHEMATIC
PERFORMANCE
This counterbalance valve is a 12 size metric, 3-ported, externally
piloted low leakage, cartridge style valve with atmospheric vent. The
check section allows free ow from the directional valve (port 2) to
the load (port 3), while normally blocking ow from port 3 to port 2.
Reverse ow is blocked until pilot pressure is applied at port 1. When
the pressure at port 3 rises above the pressure setting, the integral relief
valve is activated and vents the area behind the pilot piston.
Rated pressure 350 bar [5075 psi]*
Rated ow at
22 bar (319 psi )
140 l/min [37 US gal/min]
Weight 0.93 kg [2.05 lb]
Pilot ratio 4.7:1, 5.9:1, 6.9:1
Cavity NCS12-3
* 350 bar with steel housing
210 bar with aluminum housing
VCB12-CN
Atmospheric Vent
Atmospheric vented valves are applied when it is not practical to connect a separate vent line to the tank. Use a
single counterbalance valve when the load is unidirectional, such as aerial lifts, cranes, or winches. In load holding
applications, they are suitable for use as hose-break valves when installed near or within an actuator. Dual cartridges
can be used for controlling loads bi-directionally in motor applications, or for cylinders going over center. Since this
valve is piloted at port 1, no cross port drilling is required when dual cartridges are mounted nose to nose in an HIC.
35 70 105
140
10 20 30
l/min
0
5
10
15
20
0
50
100
150
200
250
psi
bar
US gal/min
3
2
3
2
Pressure drop
26 cSt [125 SUS] hyd.oil @ 20° C[68°F]
VCB12-CN
CB - Counterbalance Valves
Counterbalance Valves Catalog
CB - 19
mm [in]
11141737 • Rev AB • November 2013
DIMENSIONS
EXAMPLE CIRCUITS
ORDERING INFORMATION
10mm
128Max
17mm
13-17 Nm
[9-12 lbf*ft]
[2.6]
[0.63]
16
66
2
3
[Ø1.48]
Ø37.5
1
65-70 Nm [47-52 lbf*ft]
38mm
M 33x2
turn cw to increase
pressure setting
turn ccw to decrease
pressure setting
Atmospheric Vent
VCB12-CN
VCB12-CN
VCB12-CN
VCB12-CN
Load Holding -
Single Actuator
Load Holding -
Double
Actuator
VCB12-CN
