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A valve centre square with all four ports blocked.
Also known as: Closed centre condition, All ports blocked centre
In ISO 1219 fluid power diagrams a closed centre shows all four ports blocked in the rest position, holding a cylinder in place and leaving the pump deadheaded against the relief valve.
Blocks all four ports at rest, holding the actuator stationary.
Contexts: Technical drawing
Leaves the pump delivering against a closed circuit, so a closed centre valve requires either a relief path or a pressure-compensated pump.
Contexts: Technical drawing
The centre square of a directional valve containing four short strokes, each terminating against the square edge without joining any other.