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. 11, 2008
Filed:
Mar. 07, 2006
Dwight B. Stephenson, Oconomowoc, WI (US);
Xiaolong Yang, Germantown, WI (US);
Randall J. Jackson, Burlington, WI (US);
R. Christopher Hughes, Wind Lake, WI (US);
Dwight B. Stephenson, Oconomowoc, WI (US);
Xiaolong Yang, Germantown, WI (US);
Randall J. Jackson, Burlington, WI (US);
R. Christopher Hughes, Wind Lake, WI (US);
HUSCO International, Inc., Waukesha, WI (US);
Abstract
A pilot operated valve has a main poppet that selectively controls flow of fluid between first and second ports in response to pressure in a control chamber on one side of the main poppet. The main poppet has an aperture extending between the control chamber and the first port. A pilot piston slides within the aperture and has the pilot passage with a pilot orifice and a first disk spring biases the pilot piston with respect to the main poppet. A pilot valve element selectively engages the pilot orifice to open and close the pilot passage and thereby controls motion of the main poppet. Forces from the first disk spring and a pressure differential between control and pilot chambers alter a position of the pilot valve seat with respect to the main poppet. The change in position compensates for effects on valve operation due to variation of the pressure at the two ports.