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, 1999
Filed:
Aug. 11, 1997
Raud A Wilke, Dousman, WI (US);
Xiaolong Yang, Germantown, WI (US);
HUSCO International Inc., Waukesha, WI (US);
Abstract
A pilot operated control valve has a housing defining an inlet and an outlet. A main valve poppet selectively engages a valve seat to control flow of fluid between the inlet and outlet. An aperture in the main valve poppet opens into a control chamber on a side of the main poppet remote from the valve seat. A pilot passage is formed in the main valve poppet with an inlet section between the inlet and the control chamber, and an outlet section between the aperture and the control chamber. A pilot poppet has a body that selectively seals communication between the control chamber and the aperture, and a pressure balancing stem attached to the body extends into the aperture. The pressure balancing stem having a recess which is acted upon by pressure in the outlet section and having an end which is acted upon by pressure in the inlet section. The pilot operated control valve also incorporates a compression check valve and/or a reverse flow check valve.