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. 04, 1994
Filed:
Apr. 22, 1993
James A Hood, Concord, NC (US);
Ingersoll-Rand Company, Woodcliff Lake, NJ (US);
Abstract
An apparatus for regulating the fluid throughput of a rotary screw compressor from a full capacity operating condition to a desired predetermined capacity operating condition includes a turn valve or spiral valve which is disposed in fluid communication with a low pressure fluid. A stepping motor positions the turn valve in a predetermined orientation. A position sensing means is operably connected to the turn valve. The position sensing means detects the angular orientation of the turn valve. A pressure sensing means detects a compressor service pressure. An electronic control means directs the stepping motor in a predetermined orientation. The electronic control means is independently operable to regulate the fluid throughput of the rotary screw compressor from a full capacity operating condition to a predetermined capacity operating condition in response to the first pressure sensing means.