Fluid handling – Systems – Multi-way valve unit
Patent
1989-12-01
1991-04-02
Michalsky, Gerald A.
Fluid handling
Systems
Multi-way valve unit
25112916, 25112918, F15B 13044
Patent
active
050044400
ABSTRACT:
A pressure control valve includes a spool valve slidable in a valve sleeve having a supply port, an output port and an exhaust port, and adapted to receive a load caused by an electromagnet and applies through a push rod, a spring load, and an output pressure feedback load. The balance among the loads is arranged to control the output pressure at a level corresponding to the electric signal input to the electromagnet. Provision is made for preselecting the gradient of the attractive force of the electromagnet with respect to the stroke of a plunger slidable within the core of the electromagnet and for adjusting the axial position of the plunger. Specifically, the electromagnet includes a coil assembly, a cylindrical core having an axially extending opening through which receives the push rod, and a cup-shaped plunger fixed to one end of the push rod and covering the core. The inner cylindrical surface of the cup-shaped plunger is tapered to converge toward the bottom of the plunger. The push rod position is adjusted by bringing the tip of the push rod into contact with a screw member threaded into a hole in a cylindrical portion extending from the center for a cover of the electromagnet portion. The push rod axial position is adjusted by inserting a ring between the mutually confronting tips of the push rod and a distal column portion of the spool valve.
REFERENCES:
patent: 1939912 (1933-12-01), McNeal
patent: 3749128 (1973-07-01), Sallberg et al.
patent: 3858135 (1974-12-01), Gray
patent: 4635683 (1987-01-01), Nielsen
patent: 4f838313 (1989-06-01), Kobayashi et al.
patent: 4838517 (1989-06-01), Miki et al.
patent: 4838518 (1989-06-01), Kobayashi et al.
Aisin AW Kabushiki Kaisha
Michalsky Gerald A.
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