How does a proportional valve differ from a servo valve in a hydraulic system, and what are their respective applications?

Proportional valves and servo valves are both types of electro-hydraulic valves used to control flow or pressure in a hydraulic system proportionally to an electrical input signal, but they differ in precision, response time, and complexity. A proportional valve typically uses a solenoid or torque motor to position a spool, which controls the flow path. The spool position is proportional to the input current or voltage. Proportional valves generally offer good control and are suitable for applications where moderate precision and response time are sufficient. They often....