Solenoid valve for a fuel system

A solenoid valve for a fuel system, the solenoid valve comprising:

• a housing comprising an inner shoulder;
• an electric coil disposed in the housing;
• a magnetic core disposed in the housing;
• a valve base body comprising a valve seat;
• a valve member;
• a valve spring;
• an armature plate;
• wherein the valve member, the valve spring, the armature plate, and the valve base body comprising the valve seat are all connected captively to each other outside of the housing to form an integral preassembled valve unit;
• wherein in the integral preassembled valve unit, outside of the housing, the valve base body comprising the valve seat is loosely and captively secured with clearance between the valve member and the armature plate;
• wherein the solenoid valve is configured such that the integral preassembled valve unit is insertable from outside of the housing into an open end of the housing without disassembling the integral preassembled valve unit;
• wherein the integral preassembled valve unit is secured in the housing and wherein the valve spring, when the integral preassembled valve unit is secured in the housing, contacts the inner shoulder of the housing;
• wherein the armature plate forms, together with the magnetic core, a magnetic circuit;
• wherein the valve member is supported on the armature plate;
• wherein the valve seat comprises an outlet and the valve member is configured to be switched to open and close the outlet;
• wherein, when the electric coil is supplied with current, a magnetic field is generated in the magnetic core and the armature plate is attracted by the magnetic core into an operative valve position;
• wherein the valve spring is configured to return the armature plate from the operative valve position into a rest position when the coil is currentless;
• wherein the solenoid valve is configured to be in an open state when no current is supplied.

A solenoid valve for a fuel system, the solenoid valve comprising:

• a housing comprising an inner shoulder;
• an electric coil disposed in the housing;
• a magnetic core disposed in the housing;
• a valve base body comprising a valve seat;
• a valve member;
• a valve spring;
• an armature plate;
• wherein the valve member, the valve spring, the armature plate, and the valve base body comprising the valve seat are all connected captively to each other outside of the housing to form an integral preassembled valve unit;
• wherein in the integral preassembled valve unit, outside of the housing, the valve base body comprising the valve seat is loosely and captively secured with clearance between the valve member and the armature plate;
• wherein the integral preassembled valve unit is secured in the housing and wherein the valve spring, when the integral preassembled valve unit is secured inside the housing, contacts the inner shoulder of the housing;
• wherein the solenoid valve is configured such that the integral preassembled valve unit is mountable by inserting the integral preassembled valve unit from outside of the housing into an open end of the housing without disassembling the integral preassembled valve unit;
• wherein the integral preassembled valve unit is reproducibly insertable into the open end of the housing such that the valve spring is free of any spring forces when the integral preassembled valve unit is completely mounted;
• wherein the armature plate forms, together with the magnetic core, a magnetic circuit;
• wherein the valve member is supported on the armature plate;
• wherein the valve seat comprises an outlet and the valve member is configured to be switched to open and close the outlet;
• wherein, when the electric coil is supplied with current, a magnetic field is generated in the magnetic core and the armature plate is attracted by the magnetic core into an operative valve position;
• wherein the valve spring is configured to return the armature plate from the operative valve position into a rest position when the coil is currentless.