F - Mech Eng,Light,Heat,Weapons – 16 – K
Patent
F - Mech Eng,Light,Heat,Weapons
16
K
251/14
F16K 31/04 (2006.01) F16K 31/06 (2006.01)
Patent
CA 1215033
APPLICATION OF KENNETH E. BEYER AND WILHELM H. HORLACHER TWO-STAGE SOLENOID VALVE ABSTRACT A two-stage solenoid valve uses a pair of stacked coaxial armatures separated by a predetermined gap which is maintained by a first spring therebetween. A coaxial connecting rod extends between a first armature and the second armature and is attached to the first armature. A head on the unattached end of the rod bears against a bottom surface of a recess in the second armature to limit the expansion of the first spring. A second spring is arranged to contact the head of the rod and to extend therefrom to a plug in the end of a cylindrical housing surrounding the first and second armatures. The first armature is provided with a fluid sealing surface on a first end for sealing an adjacent fluid port in the valve in response to the spring force exerted by the second spring. A first and a second solenoid coil assembly are coaxially stacked to surround the cylindrical sleeve housing adjacent to respective ones of the first and second armatures. The coils are connected in series with a center tap connection therebetween to allow either parallel or single coil energization. A first and a second source of energizing power is used to selectively energize the first and second electromagnetic solenoid coil assemblies to control the positioning of the first and second armatures to provide a first and a second spacing of the sealing surface from the orifice during an open state of the valve to provide a first and a second flow rate, respectively, through the valve. During a deenergized state of the valve, the second spring acts through the connecting rod and the first armature to urge the sealing surface against the orifice. - 2 -
438888
Beyer Kenneth E.
Horlacher Wilhelm H.
Parker-Hannifin Corporation
Smart & Biggar
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