Two-Way Directional Valve
A two-way directional valve consists of two ports connected to each other with
passages, which are connected and disconnected. In one extreme spool position, port
A is open to port B; the flow path through the valve is open. In the other extreme,
the large diameter of the spool closes the path between A and B; the flow path is
blocked. A two-way directional valve gives an on-off function.
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