Counterbalance Valves Technical Information
154 SUS (33 cSt) hyd. oil @ 100° F (38° C)
psi bar
62
Dual Counterbalance - Hydraulic Vent
CP448-2
OPERATION
This dual valve, internally piloted HIC is a low leakage
counterbalance assembly with hydraulic vent. The CP448-2 uses
two CP448-1 8-size cartridges and allows free ow from the V ports
to the C ports and blocks ow in the reverse direction until the relief
setting is reached, or until adequate pilot pressure has been applied
to the opposite V port.
APPLICATIONS
Dual counterbalance HIC’s are used for controlling loads in bidirectional
motion such as wheel motor applications or for cylinders going over
center. They are also suitable for use on the boom and dipper cylinder on
an excavator.
SPECIFICATIONS SCHEMATIC
Rated pressure 350 bar [5075 psi]*
Rated ow at
22 bar (319 psi )
Weight 0.78 kg [1.72 lb]
Pilot ratio 3:1, 4.5:1, 8:1
Cavity CIB
* 350 bar with steel housing
210 bar with aluminum housing
20 l/min [5 US gal/min]
PERFORMANCE
30
435
363
290
218
145
25
20
15
Pressure drop
10
piloted open 1 2
free flow 2 1
8.0:1
4.5:1
3.0:1
73
BC332375678109en-000101 • February 2020
5
0
4L/min
1.1US gal/min
8121
Flow
2.13.2 4.2 5.3
0
CB - 23
DIMENSIONS
[0.63]
mm [in]
Counterbalance Valves Technical Information
Dual Counterbalance - Hydraulic Vent
CP448-2
turn ccw to increase
pressure setting
turn cw to decrease
pressure setting
63.50
[2.50]
EXAMPLE CIRCUITS
Bi-directional
Motion Control
8.38
[0.33]
88.90
[3.50]
57.91
[2.28]
9.65
[0.38]
30.99
[1.22]
C 1
16.00
79.50
[3.13]
C 2
CP448-2 CP448-2
31.75
[1.25]
31.75
[1.25]
16.00
[0.63]
Bi-directional
Load Holding
ORDERING INFORMATION
BC332375678109en-000101 • February 2020
CB - 24
Loading...