Solenoid fluid valves

An alternating current valve including in combination;

• valve body means having a fluid duct therethrough, valve seat means in fixed position intermediate said duct having a fluid passage therethrough forming a fluid orifice;
• and
• adadjacent solenoid means having a coil with ferrous core means and ferrous armature means extending therein with adjacent ends thereof forming substantially planar cooperative magnetic poles having transverse working gap means extending therebetween;
• with
• said armature having a portion adapted for sealing closure of said orifice thereby defining the de-energized limit of motion of said armature, a ferrous structure exterior of said coil forming with said core and said armature a loop magnetic circuit:
• and
• a tubular housing extending within said coil with said armature being disposed therein for operative motion axially co-extensive of said core thereby defining the energized limit of motion of said armature;
• the improvement thereof comprising,
• said housing for said armature being constructed of ferro-magnetic material of substantially the same wall thickness throughout the tubular length thereof;
• with
• said exterior ferrous structure being of unit construction formed from a strip of ferrous material of elongate rectangular plan, said loop magnetic circuit comprising only said four specified ferrous elements;
• and
• the operative travel of said armature being dimensionally less than the diameter of said fluid passage to thereby in substantial part establish the open gap or inrush electrical impedance and wattage consumption of said solenoid according to the diameter of said orifice and the unporting force to be met by said solenoid.