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:
Oct. 25, 2005
Filed:
Jun. 26, 2002
Edward H. Phillips, Troy, MI (US);
Edward H. Phillips, Troy, MI (US);
Cafe Engineering, Southfield, MI (US);
Abstract
Improved low flow impedance flow control valves are disclosed in the present invention wherein spring valve means () captured between a valve spool () and a shoulder () are utilized for selectively metering a flow of fluid from an inlet port () to an outlet port () via a round edged helical orifice () formed between the open coils of the spring valve () as a function of the instant axial position of the valve spool () and the differential pressure therebetween. An improved method of controlling low impedance flow control valves is also disclosed in the present invention. The improved method provides better accuracy in controlling fluid flow through low flow impedance flow control valves through continually cycling a means for substantially interrupting fluid flow therethrough in a low frequency pulse width modulated fashion.