The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 14, 2000
Filed:
Aug. 25, 1998
Applicant:
Inventor:
Richard A Wade, Shelby, NC (US);
Assignee:
Fasco Controls Corp., Shelby, NC (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F16K / ; F16K / ; F16K / ;
U.S. Cl.
CPC ...
251 3004 ; 123 4112 ; 123 4149 ; 251 38 ; 251 44 ;
Abstract
Solenoid-actuated control valves having low hysteresis include an annular flux housing with an axial bore extending therethrough. A coil configured to generate a magnetic field is disposed within the flux housing. A magnetic pole piece is disposed within the flux housing axial bore. A magnetic armature is slidably secured within the flux housing axial bore. A spring, positioned between the pole piece and armature, is configured to urge the armature away from the pole piece. A spool valve, slidably secured within a spool sleeve, is mechanically coupled with the armature such that the spool valve follows movement of the armature as a slave.