What is the difference in principle between a proportional solenoid valve and an electric proportional valve?

First of all, the characteristics of the two are different:

1. The characteristics of the proportional valve: the transmission of electrical signals is convenient, and the remote control is simple; it can continuously control the pressure and flow of the hydraulic system in proportion, realize the control of the position, speed and force of the actuator, and reduce the impact when the pressure changes; the number of parts is reduced , The oil circuit is simplified.

2. The characteristics of ordinary valves (that is, ordinary hydraulic valves): flexible action, reliable action, small shock and vibration during operation, low noise, and long service life; when the fluid passes through the hydraulic valve, the pressure loss is small; when the valve port is closed, the sealing performance Good, small internal leakage, no external leakage; the controlled parameter (pressure or flow) is stable, and the change is small due to external interference.