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:
Nov. 30, 1993
Filed:
Oct. 27, 1992
Farhad Golestan, Dallas, TX (US);
Trung K Pham, Dallas, TX (US);
David I Sexton, Jr, DeSoto, TX (US);
Flow Design Inc., Dallas, TX (US);
Abstract
A constant flow rate control valve (10) is provided including a cup member (12) disposed in a flow passage through the valve (10). The cup member has an orifice (18) located in an end wall (14) of the cup member (12) and a plurality of side ports (22) in a side wall (16) of the cup member (12) The cup member (12) is moveable axially within the-valve (10), with such movement being opposed by a resilient spring member (30) downstream of the cup member (12). The valve (10) includes a fixed retainer ring (26) in a valve body (24) surrounding the side wall (16) of the cup member (12) which blocks or exposes areas of the side ports (22) in response to movement of the cup member (12). Start up slots (34) in a side wall (36) of the valve body (24) are also blocked or exposed in response to movement of the cup member (12). Fluid pressure acting on the end wall (14) of the cup member (12) urges the cup member (12) against the spring (30), so that the retainer ring (26) exposes only that side port (22) area appropriate to the pressure being exerted and the cup member (12) exposes only that start up slot (34) area appropriate to the pressure being exerted.