The difference between proportional valve and servo valve is mainly reflected in the following points:

Gradually approach the servo valve,

Proportional directional valve is a kind of proportional valve, with different characteristics such as hysteresis, dead band, bandwidth, filtering accuracy, etc. The rated pressure drop of the valve is different; The proportional directional valve has a neutral function similar to that of ordinary directional valve,

The performance of the proportional servo valve is between the servo valve and the proportional valve, so the application occasions are different. The servo valve and the servo proportional valve adopt the structure of valve core+valve sleeve. The types of median function are different Proportional valves of other structures are mainly used in open loop control system and closed loop speed control system; Because the performance of the proportional valve is getting better and better; 2 The frequency response (response frequency) of the servo valve is higher. The difference between servo valve and proportional valve is not strictly regulated.

, it can be up to about 200Hz, which requires fine filtration, while the middle position function of servo valve is only O type (E type of Rexroth product