Patent ID: 7959129
Filing Date: 2011-06-14
Classification: F16K

Abstract:
1. A two-port solenoid valve constructed by concentrically disposing, in a valve body along a valve axis, a fixed iron core and a movable iron core attracted to each other by a magnetic force generated by electricity to an excitation coil, a valve seat formed in a flow passage connecting two ports, a valve member for opening/closing the flow passage by approaching/separating from the valve seat by an action of the movable iron core, and a hollow first cap and a hollow second cap fitted so as to be capable of mutual displacement for transmitting an acting force of the movable iron core to the valve member, wherein the first cap is mounted at a front end portion of the movable iron core in a state for regulating forward movement with respect to the movable iron core and has an engagement recess portion that presses the movable iron core in a direction away from the fixed iron core by being biased by an iron-core return spring and is engaged with an engagement projection portion of the second cap; the second cap has the engagement projection portion at a location fitted in the first cap, and this engagement projection portion is engaged with the engagement recess portion capable of displacement and the valve member is housed in the second cap, capable of displacement, a regulating portion for regulating forward movement of the valve member is formed at a front end portion of the second cap and a buffer spring for biasing the valve member and the movable iron core in a direction separated from each other is interposed between the valve member and the movable iron core; biasing forces F when the excitation coil is not electrified and when the movable iron core and the first cap is made to occupy an initial position by the iron-core return spring and the valve member is pressed onto the valve seat by the buffer spring, gaps are interposed between the valve member and the regulating portion of the second cap and between the engagement projection portion of the second cap and a front end wall of the engagement recess portion in the first cap, respectively.