Patent ID: 8950381
Filing Date: 2015-02-10
Classification: F02B,F02D,F02M,F16K,G01D,Y10T

Abstract:
1. An electrically operated fluid valve for controlling a fluid flow in a fluid passage in a fuel supply unit of an internal combustion engine, the fluid valve comprising: an axially movable plunger including a permanent magnet having its magnetic direction axially oriented providing a front pole and a real pole; an axially extending chamber with two opposite located valve seats limiting the axial movement of the plunger, a front valve seat facing the front pole and a rear valve seat facing the rear pole; at least one front ferromagnetic element at the front valve seat and a rear ferromagnetic element at the rear valve seat, enabling two stable valve positions, a closed position, when the plunger rests at the front valve seat, preventing fluid flow in the fluid passage, and an open position, when the plunger rests at least one rear valve seat, allowing fluid flow in the fluid passage, by designing the forces between the magnet and respectively ferromagnetic element so that the magnetic force between the front pole and the front ferromagnetic force between the front pole and the front ferromagnetic element is stronger than the magnetic force between the rear pole and the rear ferromagnetic element when the plunger is at the front valve seat and so that the magnetic force between the rear pole and the rear ferromagnetic element is stronger than the magnetic force between the front pole and the front ferromagnetic element when the plunger is at the rear valve seat; electromagnetically operating means to axially snap the plunger between the two stable valve positions when energized; and at the closed respectively open position the magnet of the plunger and the ferromagnetic element of the corresponding valve seat are distanced from direct contact with each other.