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:
Jun. 03, 2008
Filed:
Dec. 31, 2003
John Michael Roll, Fawkham, GB;
Peter Michael Woodard, Horndon-on-the-Hill, GB;
Andrew Albert Ellingham, Dartford, GB;
Terence William Thomas Young, Gravesend, GB;
John Michael Roll, Fawkham, GB;
Peter Michael Woodard, Horndon-on-the-Hill, GB;
Andrew Albert Ellingham, Dartford, GB;
Terence William Thomas Young, Gravesend, GB;
AAF-MCQUAY, Inc., Louisville, KY (US);
Abstract
A valve comprises a housing () having an inlet () and an outlet (), and a pressure sensing port (). A piston () slides in a part () of the housing () in response to a difference between a first fluid pressure at the pressure sensing port on the one side of the piston, and a second fluid pressure at the inlet and/or outlet on the other side of the piston (). A valve member () carried by the piston is operable thereby to close the inlet () when said second fluid pressure is less than a value sufficiently greater than said first fluid pressure. The valve member () is movable with respect to the piston () to facilitate closing of the inlet (), in response to a fluid flow from the housing () to the inlet (), when the piston is not acting to close the inlet.