# US 4,392,634 A · Electromagnetic valve

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- Number: US 4,392,634 A
- Document ID: US4392634A
- Status: Granted
- Kind: A
- Application number: 06/231,320
- Filed: 1981-02-04
- Granted: 1983-07-12
- Earliest claimed: 1980-02-04
- Assignees: Fujikin International, Inc.
- Inventors: Toshio Kita
- Web page: https://patentgrep.com/patent/US4392634A

## CPC

- F16K 31/0655: {Lift valves}
- F16K: VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING {(devices for emptying and evacuating the excess liquid in valves or conduits F16L55/07)}

## Abstract

An electromagnetic valve comprises a valve case having incorporated therein a member for closing a fluid channel through the valve case, a stationary core, a movable core aligned with the core, an exciting coil surrounding the cores, a support member fixed to the valve case for guiding the movement of the movable core, and a shading coil provided on one end of the stationary core which end is opposed to the movable core. The movable core is movable by a magnetic attracting force generated by the exciting coil to thereby operate the closing member. The support member extends toward the stationary core, and the extension is integrally formed with a disk portion in contact with the surface of the small-diameter end and a projecting edge covering the periphery of the small-diameter end. This end is fitted in the projecting edge, which is welded at its forward end to the stationary core.

## Claims

### Claim 1

An electromagnetic valve comprising:
a valve case having a fluid inlet, a fluid outlet and a channel holding the inlet in communication with the outlet, the channel being provided with a valve seat,
a valve stem having a closing member for blocking the channel by contact with the valve seat,
a movable core supporting the valve stem movably to bring the closing member into or out of contact with the valve seat,
a spring biasing the valve stem in a direction to bring the closing member into contact with the valve seat,
a support comprising a hollow cylindrical portion and an attaching portion fixed to the valve case for supporting the movable core movably,
a stationary core aligned with the movable core,
an exciting coil surrounding the movable core and the stationary core, and
a shading coil provided on an end surface of the stationary core which surface is opposed to the movable core,
the stationary core having a small diameter at the end thereof provided with the shading coil,
the cylindrical portion of the support extending toward the stationary core,
the cylindrical portion being integrally formed with a disk portion in contact with the end surface of the stationary core and a projecting edge covering the periphery of the small-diameter end of the stationary core,
the small-diameter end fitting in the projecting edge with the forward end of the projecting edge welded to the stationary core.

### Claim 2 (depends on 1)

An electromagnetic valve as defined in claim 1 wherein the valve case, the valve stem, the movable core and the support are made of a corrosion-resistant material.

### Claim 3 (depends on 1)

An electromagnetic valve as defined in claim 1 wherein the support is made of a nonmagnetic material.