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Parker Hannifin Corporation
Open-Center Directional Control Valve
VO40
Catalog HY17-8505/UK
Handle Actuation vs. Spool Direction
Push Handle
Pull Handle
• Spool Out
• Energize port “B”
• Port “A” to tank
• Spool In
• Energize port “A”
• Port “B” to tank
Left-Hand Joystick
Spool OUT - Section 1
Power to “B” Port
Spool IN – Section 1
Power to “A” Port
Spool IN – Section 2
Power to “A” Port
Spool OUT – Section 2
Power to “B” Port
Right-Hand Joystick
Spool OUT - Section 2
Power to “B” Port
Spool IN – Section 2
Power to “A” Port
Spool OUT – Section 1
Power to “B” Port
Spool IN – Section 1
Power to “A” Port
A B
TANK
OPEN
CENTER
PARALLEL
PATH
TANK
OPEN
CENTER
PARALLEL
PATH
Note:
Circuit reflects spool
position, not handle
position.
Technical Information