HYDRAULIC AIR BLEED VALVE SYSTEM

摘要

An air bleed valve having a housing with hydraulic fluid therein and a first acoustic wave sensor mounted within the housing so as to be covered in the hydraulic fluid and a second acoustic wave sensor mounted within the housing so that it can detect when air is present in the housing sufficient to be vented outside upon the opening of an air vent valve and where both the first acoustic wave sensor and the second acoustic wave sensor and the air vent valve are electrically connected to a air bleed controller. In a preferred embodiment, the first and second acoustic wave sensors are of the type known as a shear horizontal surface acoustic sensor.