What is the reason why the FESTO proportional valve is not closed?
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Reasons: Variety: FESTO proportional control valve spool and valve seat cavity space with a large tolerance, can not be completely closed; spool due to packing damping parts and other poor assembly and friction caused by the valve spool action is not in place; spool movement is dead Zone, although the dead zone is unavoidable, but the dead zone range is too large to completely shut down; the proportional controller has an offset that can't output a zero signal; the electromagnet of the FESTO proportional control valve has hysteresis characteristics and the electromagnet is left Magnetically induced; the signal to the proportional controller cannot reach the true zero signal state; the proportional controller or proportional valve is subjected to electromagnetic interference; the differential pressure across the valve is too large, and the damping and static friction are poor.
The throttling gap is expanded, such as wear and scratches, and the valve stem stroke is short. Foreign matter stuck, such as carbon residue, impurities. Actuator output thrust is not enough, such as wind pressure, springs, feedback. The cause of a failure is ever-changing, but the specific reason for a failure may have only one or a few interactions. Therefore, although the experience is important, it can only be known if it actually arrives at the scene and is actually observed.