Mobile valves (AMCA) - Fluitronics GmbH

The operation of the proportional directional valve with electrically controlled pilot stage (MEV) is explained below. When solenoid a is actuated, it pushes the control spool (control piston) toward solenoid b and opens spool cross-section 1. This releases control pressure to spring chamber 1 (speed controlled by adjustable orifice 5) and through orifice 3 to the end of the spool opposite solenoid a. The balancing force on the control spool is the force of the solenoid, which is proportional to the electrical input signal. The balancing force corresponds to the control pressure in the solenoid b and also in the spring chamber 1.This pressure presses the main spool against the spring in the spring chamber 2 and thus assumes a position proportional to the electrical input signal. The screws on the spring chambers can be used to limit the maximum flow by screwing in the screws and thus limiting the stroke of the main spool. In addition to the sectional design, the APV series is also available in the so-called plate-mounted design. This is characterized by the fact that the individual control sections are connected via a common base plate. This can have advantages if certain connectio