How many ports and positions does a standard 4/3-way directional control valve have?

• A. 4 ports and 3 positions
• B. 3 ports and 4 positions
• C. 4 ports and 2 positions
• D. 5 ports and 3 positions

Answer: (A)

In directional control valves, the numbers in the designation show how many ports and how many positions the valve has. A 4/3-way valve uses four ports: P for the pressure source, T for the tank or exhaust, and two work ports (A and B) that connect to the actuator. It has three positions, meaning the internal passages can be set in three distinct ways: two active states where P is routed to one work port and the other work port is vented to T, and a neutral center position where flow paths are typically blocked or vented, depending on design. This combination—four ports and three positions—is what defines a standard 4/3-way directional control valve.