How to realize the flow regulation of solenoid valve?

First of all, it should be clear that the solenoid valve only has two states of on flow and off flow, because the response speed of the solenoid valve is very fast, both of which are millisecond level. The instantaneous suction of the solenoid valve, its stroke is generally mm to cm, whether it is electromagnetic effect or inertia. According to the law of nature, the valve core can not hover, let alone control at any position where the control valve sends 4-20mA signal.

As early as the 1980s and 1990s, there were solenoid valve designers in Europe. Through different caliber solenoid valves, two, three, four or more solenoid valves of different caliber can be connected in parallel, and dozens of flow control schemes can be realized.