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. 02, 1999
Filed:
Nov. 21, 1997
Roy A Mangano, Tucson, AZ (US);
Werner J Kroebig, Tucson, AZ (US);
Raytheon Company, Lexington, MA (US);
Abstract
A pressure activated flow controller for use with a Joule-Thomson valve having a diaphragm actuator that is located outside a dewar, and which is not cooled. The diaphragm actuator limits flow based on gas pressure supplied to the dewar from a gas supply, not temperature, and does not impede cooldown of a device coupled to the dewar. The diaphragm actuator comprises a diaphragm and load plate that exert a force to open the Joule-Thomson valve. A wave spring provides a force to close the Joule-Thomson valve, thus balancing the back pressure of the gas supply. The diaphragm actuator is compact, and limits flow based on gas supply pressure, not temperature. The present invention thus uses pressure regulation instead temperature regulation to achieve flow control.