Electroproportional solenoid valve unit

Details Electroproportional solenoid valve unit Electroproportional solenoid valve unit

1995-02-10

1997-01-14

Michalsky, Gerald A.

Fluid handling

Systems

Multi-way valve unit

13762568, 25112907, F15B 13044

Patent

active

055929729

ABSTRACT:
An electroproportional solenoid valve unit has a valve housing with hydraulic connectors for a hydraulic medium. A piston with a hollow interior is positioned in the valve housing and is slidable therein. A pressure spring is arranged at one end of the piston. A solenoid is connected to the valve housing and cooperates with the other end of the piston for moving the piston counter to the force of the spring. A first hydraulic chamber is located at the first end of the piston and a second hydraulic piston is located at the second end of the piston. The piston has a first annular channel adjacent to the first hydraulic chamber and a second annular channel adjacent to the second hydraulic chamber. The first and second annular channels are connectable to the hydraulic connectors. The second hydraulic chamber facing the solenoid is separated from the hollow interior of the piston and from the second annular channel. The first annular channel is connected to the hollow interior of the piston with at least one opening.

REFERENCES:
patent: 4491153 (1985-01-01), Barthomaus
patent: 5117869 (1992-06-01), Kolchinsky

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