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. 09, 2004
Filed:
Aug. 06, 2002
Edward A. Flynn, Pewaukee, WI (US);
Curt L. VanWeelden, Sussex, WI (US);
Husco International, Inc., Waukesha, WI (US);
Abstract
A valve has a body has a bore into which open an inlet, an outlet, and a workport. A first valve seat is between the inlet and the workport, and a second valve seat is between the outlet and work ports. A poppet slides within the bore and a spring biases the poppet toward the first valve seat. Pressure at the inlet acts on surfaces of the poppet producing opposing forces that respectively tend to move the poppet toward the first and second valve seats. Because of differing surface areas, the nominal inlet port pressure exerts a net force on the poppet which substantially counteracts the spring force. Thus a solenoid actuator needs only to produce a relatively small force to move the poppet away from the first valve seat into engagement with the second valve seat.