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Parker Hannifin Corporation
Open-Center Directional Control Valve
VO40
Catalog HY17-8505/UK
3010
20
7.92.6 5.3
50
13.2
Flow
0
LPM
GPM
0
43.5 3
87.0
6
130.5 9
174.0
217.5
PSI
12
15
Bar
Pressure
40
10.6
Pressure Drop - Open Center P T
Top Inlet to Top Outlet
→
T
P
8 Section Valve
3 Section Valve
1 Section Valve
3010
20
7.92.6 5.3
50
13.2
Flow
0
LPM
GPM
0
43.5 3
87.0
6
130.5 9
174.0
217.5
PSI
12
15
Bar
Pressure
40
10.6
Pressure Drop - Open Center P T
Side Inlet to Side Outlet
→
P
T
8 Section Valve
3 Section Valve
1 Section Valve
3010
20
7.92.6 5.3
50
13.2
Flow
0
LPM
GPM
0
43.5 3
87.0
6
130.5 9
174.0
217.5
PSI
12
15
Bar
Pressure
40
10.6
Pressure Drop - A T
Cylinder Port to Side Outlet
→
3010
20
7.92.6 5.3
50
13.2
Flow
0
LPM
GPM
0
43.5 3
87.0
6
130.5 9
174.0
217.5
PSI
12
15
Bar
Pressure
40
10.6
Pressure Drop - P A
Top Inlet to Cylinder Port
→
A
P
8 Section Valve
3 Section Valve
1 Section Valve
8 Section Valve
3 Section Valve
1 Section Valve
T
A
Environmental Characteristics
The valve can be mounted in all conceivable directions.
However, the mounting base should be flat and stable so
that the valve is not subjected to strain.
While the o-rings in the valve are normally of nitrile rub-
ber, there are a number of special fluorocarbon variants.
Please contact Parker for further information.
Temperature
Oil temperature, working range:
+20°C to 90 °C (68 to 194 °F)*
Filtration
Filtration must be arranged so that Target Contamination
Class 20/18/14 according to ISO 4406 is not exceeded.
For the pilot circuit, Target Contamination Class 18/16/13
according to ISO 4406 must not be exceeded.
Hydraulic Fluids
Best performance is obtained using mineral-base oil of
high quality and cleanliness in the hydraulic system.
Hydraulic fluids of type HLP (DIN 51524), oil for automatic
gearboxes Type A and engine oil type API CD can be
used.
Viscosity, working range: 15-380 mm
2
/s (15-380 cST)**
Technical information in this catalog is applicable at
an oil viscosity of 30 mm
2
/s (30 cST) and temperature
of 50 °C (122 °F) using nitrile rubber seals.
* Product operating limits are broadly within the above range, but
satisfactory operation within the specification may not be accom-
plished. Leakage and response will be affected when used at tem-
perature extremes and it is up to the user to determine acceptability
at these levels.
** Performance efficiency will be reduced if outside the ideal values.
These extreme conditions must be evaluated by the user to establish
suitability of the product’s performance.
NOTE: ISO VG 46 oil @ 50 °C
Performance Curves
Technical Information