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. 08, 2004
Filed:
Jun. 07, 2002
Thomas Edward Gajewski, North Tonawanda, NY (US);
Praxair Technology, Inc., Danbury, CT (US);
Abstract
A valve assembly in which a primary valve is provided within a primary passageway of a valve housing to control flow rates of a fluid flow within the primary passageway. The primary valve is moved between open and closed positions relative to a valve seat defined in the primary passageway to produce higher flow rates as the primary valve is moved towards the open position and lower flow rates as the primary valve is moved towards the closed position. As the primary valve is moved towards the closed position an ever increasing flow rate occurs within a secondary passageway formed in the primary valve by at least an orifice. A secondary needle valve, projecting into the orifice, meters such ever increasing flow rate and thereby the lower flow rates of the fluid flow. The secondary needle valve can be attached to the valve housing and thus, be fixed in position or can be attached to a valve steam to control the degree to which the secondary needle valve projects into the orifice.