Which valve transforms an analog electrical input signal into proportional opening cross-sections at the outputs?

Which valve transforms an analog electrical input signal into proportional opening cross-sections at the outputs?

• A. 4/3-way proportional valve
• B. 4/3-way regulating valve
• C. 4/2-way directional valve
• D. 4/2-way proportional valve

Answer: (A)

Translating an analog electrical signal into a smooth, variable hydraulic flow requires a valve that responds proportionally to the input. A four-port, three-position proportional valve is designed for this: the electrical signal moves the spool continuously, changing the openings of the two work ports in direct proportion to the input. That means the flow (and thus the actuator movement or force) can ramp smoothly rather than jump in steps. This setup provides two controlled output openings (the two work ports) while the supply and return paths are kept separate, allowing proportional control of the hydraulic circuit. Other valves are not inherently proportional: a four/2-way valve mainly offers on/off switching with fixed openings; a four/3-way regulating valve uses feedback to regulate a condition (like pressure or flow) rather than mapping the input signal to proportional openings.

Translating an analog electrical signal into a smooth, variable hydraulic flow requires a valve that responds proportionally to the input. A four-port, three-position proportional valve is designed for this: the electrical signal moves the spool continuously, changing the openings of the two work ports in direct proportion to the input. That means the flow (and thus the actuator movement or force) can ramp smoothly rather than jump in steps.

This setup provides two controlled output openings (the two work ports) while the supply and return paths are kept separate, allowing proportional control of the hydraulic circuit. Other valves are not inherently proportional: a four/2-way valve mainly offers on/off switching with fixed openings; a four/3-way regulating valve uses feedback to regulate a condition (like pressure or flow) rather than mapping the input signal to proportional openings.