Three-way three-position control valve having a piezoelectric or magnetostrictive actuator, and fuel injection system comprising this valve

摘要

Described herein is an electrically actuated control valve (1) comprising three mouths (2, 4, 6) and three operating positions (P1, P2, P3), in which the three mouths (2, 4, 6) comprise: - a first mouth (2) for inlet of a working fluid, and - a second mouth (4) and a third mouth (6) for outlet of the working fluid, and wherein the three operating positions (P1, P2, P3) comprise: - a first operating position (P1) in which a passage of fluid from the first mouth (2) to the second mouth (4) and the third mouth (6) is enabled, - a second operating position (P2) in which a passage of fluid from the first mouth (2) to only one (6) of said second and third mouths (4, 6) is enabled, and - a third operating position (P3) in which the passage of fluid from the first (2) to the second mouth (4) and the third mouth (6) is disabled. The control valve (1) further comprises an electric or electromagnetic actuator (8), which can be controlled for causing a switching of the operating position (P1, P2, P3) and a moving element comprising a first valve element (12) and a second valve element (14) designed to co-operate, respectively, with a first valve seat (A1) and a second valve seat (A2) for controlling the passage of fluid from the first mouth to the second and third mouths providing the aforesaid three operating positions (P1, P2, P3). The electric actuator is of a type chosen between a piezoelectric actuator and a magnetostrictive actuator.