Electrohydraulic proportional controls modulate hydraulic parameters according to the electronic reference signals. Proportional electrohydraulics is the ideal interface between hydraulics and electronic systems to achieve fast, smooth and accurate motions required by today’s modern machines and plants.
Atos proportional valves allow better performances in comparison with the servovalves while maintaining the typical benefits of proportional hydraulics: Less sensitivity, coarse filtration, intrinsic stability and easier servicing.
What is a proportional Valve??
The core of electrohydraulic controls is the proportional valve that regulates pressure or flow according to the reference input signal supplied by the CNC machine. Particularly, the proportional valve must be operated by an electronic driver which regulates a proper electrical current supplied to the valve’s solenoid according to the reference signal. The solenoid converts the electric current in to mechanical force which moves the spool against a return spring; rising of current produces corresponding input in the output force and consequent compression of the return spring. The proportional valves can be single stage or piloted, with or without pressure/position transducer. Proportional valves with transducer provide better regulation accuracy. In pilot operated executions, the proportional pilot valve regulates flow and pressure acting on the main operated stage. When electrical failure occurs, return springs restore the neutral position according to valve configuration, to ensure a fail-safe operation.
These valves are suitable for applications where parameters are to be controlled with high precision, acceleration/deceleration is needed (like simulators), etc.