In principle it is possible to proportionally control the plunger with variable DC voltage, however in practice static friction on the guide points of the plunger impairs the sensitivity of the valve, which results in greater hysteresis effects (the phenomenon in which the value of a physical property lags behind changes in the effect causing it). Proportional solenoid valvesįigure 1: Functional Principle of direct-acting Solenoid Control Valves Operating Principle In a direct-operated proportional solenoid valve, the plunger is the restrictor. A proportional control solenoid valve utilizes a solenoid as an actuator for variable valve positioning.Ī direct-operated 2-way standard proportional solenoid valve operates very similar to a direct-operated solenoid valve with the difference that the former operates through a range of valve positioning while the later only provides two switching states (i.e. In an automatic control valve, the restrictor is directed by a signal from a controller called an actuator.

The other minor parameters include: weight, thickness, humidity, density, Ph, color and viscosity.

The regulated flow rate subsequently adjusts parameters affecting a process in a system, mainly level, pressure and temperature. Proportional Solenoid Valve - How They WorkĪ proportional control valve is a valve used to control fluid flow rate by varying the size of the flow passage via a restrictor.

Electric solenoid valve hydraulic