Fluid dynamic valve with direct electromagnetic control with slider-latching device

Claim 1

An electromagnetic actuated hydraulic valve comprising a valve body having a plurality of channels for the flow of a hydraulic fluid, a slider mounted for sliding movement within said valve body to control the flow of fluid within said channels, electromagnet means mounted on said valve body and including an electric coiling, a cylinder fixedly secured to said body within said coiling, a fixed magnetic counter armature having a coaxial throughbore, a movable magnetic armature slidably guided within said cylinder, a pusher freely extending through said counter armature coaxial with said cylinder between said movable armature and said slider for transferring motion of said movable armature to said slider, said pusher having the shape of a cylindrical rod with at least one annular groove and being carried by said movable magnetic armature, said magnetic counter armature having in that end thereof remote from said movable armature a cylindrical axial cavity terminating at an inner end in a plane wall disposed normal to said pusher, resilient mechanical latching means at least partially seated in said cavity for permitting the sliding of said slider by said pusher in the axial direction under the action of said movable armature while ensuring the stoppage of said slider in certain predetermined positions when the thrust action of said movable armature ceases overcoming forces tending to axially displace said slider; said resilient latching means including a wire means disposed in a plane and being shaped to comprise two symmetrical substantially semicircular inner portions radially urged against said pusher passing therebetween so as to contact the major part of the circumferential surface of the pusher and being snapable into said annular groove thereof, and two symmetrical substantially semicircular outer portions, radially urged against the inner wall of the cylindrical cavity of said counter armature so as to contact the major part of the circumferential surface thereof.