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:
May. 14, 2002
Filed:
Sep. 14, 2000
Walter W. Powell, Sugar Land, TX (US);
Flow Safe, Inc., Orchard Park, NY (US);
Abstract
A non-flowing pilot valve is disclosed having a sense piston assembly ( ) and a feedback sleeve ( ) co-axially mounted within a valve body ( ). A dome-line chamber ( ) and an exhaust-line chamber ( ) are isolated from each other by a feedback sleeve top shoulder ( ) contacting a pop seal ( ) on the valve body ( ) below set pressure. At a few percentage points of inlet ( ) pressure below set pressure, a reseat seal of a foot ( ) portion of the sense piston ( ) contacts the bottom shoulder ( ) of the feedback sleeve ( ) thereby closing off the dome-line chamber ( ) from below and above and “locking in” dome line pressure. An increase in inlet ( ) pressure above set pressure causes the sense piston ( ) to move up simultaneously carrying feedback sleeve ( ) with it thereby opening the dome-line chamber ( ) to the exhaust-line chamber ( ) below the open top shoulder ( ).