SERVOGESTEUERTES ELEKTROVENTIL

摘要

A servo-operated electrovalve includes a plurality of duct controlling pistons and fluid storing capacity means. One of the pistons controlls a fluid discharge duct and has a throttling hole, as well as calibrated spring means urging the piston away from a valve seat of the discharge duct. The valve is able - to carry-out a pre-set pressure time discharge curve, comprising a first sudden pressure drop as obtained during filling the capacity means, a second slow pressure decrease through the throttling hole and a third sudden pressure drop, when the force of the spring means overcomes the action of discharge pressure fluid on the piston and moves the same away from the seat, thus freeing the discharge duct.