Directional Control Valves Classification by Port/Position Count
The port count indicates the number of connectable lines, and the position count indicates the number of change- overs in the directional control valves. Table 4.1 lists the classifications. The valves with four ports and three
positions are very popular. The four ports include: pump port (P), tank port (T), and cylinder ports (A and B). The symbols are often appended with graphic symbols of the directional control valves.
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