Magnetically linked multi-valve system

Abstract

A magnetically linked twin-valve assembly is electromagnetically actuated in response to excitation of a single solenoid winding. Valve-body structure features relatively thick non-magnetic and magnetic slabs which are bonded into a consolidated body block, in laminated alternation, prior to machining the same for dual-valve purposes. Two spaced guide bores through the body block accommodate movement of separate valve members of magnetic material; the upper end of each of these valve members is upwardly exposed in confronting relation with one to the exclusion of the other pole face of the U-shaped core of an electromagnet, whereby a single magnetic circuit, established by the U-shaped core and the valve members, relies upon the middle slab of magnetic material to complete the circuit by magnetically linking both valve members. Inlet and outlet flows of pressure fluid pass through separate chambers formed primarily in the lowermost slab on the respective guide-bore alignments. Except for a valve-seat and outlet, each valve chamber is closed at its lower end, and spring means reacting between the pole faces of the U-shaped core and the respective valve members normally urge the valve members into seated, valve-closed coaction with their valve seats. Electrical excitation is effective to displace both valve members to valve-open position, against spring action, for assured valve closure when the electrical excitation ceases.