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Parker Hannifin Corporation
Open-Center Directional Control Valve
VO40
Catalog HY17-8505/UK
Contents
Introduction .............................................................................................................................................................1
Technical Information
General Description ..........................................................................................................................................3
Operation ..........................................................................................................................................................3
Benefits ............................................................................................................................................................3
Specifications ...................................................................................................................................................4
Weights .............................................................................................................................................................4
Connections .....................................................................................................................................................4
Performance Curves .........................................................................................................................................5
Environmental Characteristics ..........................................................................................................................5
Schematic Circuit Types ...................................................................................................................................6
Dimensions ....................................................................................................................................................7-8
Handle Actuation vs. Spool Direction ...............................................................................................................9
Ordering Information
How to Order ..................................................................................................................................................10
General Valve Assembly .................................................................................................................................11
Inlet Cover .................................................................................................................................................12-13
Outlet Cover ..............................................................................................................................................14-15
Work Sections ...........................................................................................................................................16-20
Mid-Inlet ..........................................................................................................................................................21
Assembly Configuration Form ............................................................................................................................22