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:
Sep. 10, 1991
Filed:
Oct. 29, 1990
Theiss Stenstrom, Nordborg, DK;
Jens J Molbaek, Nordborg, DK;
Poul E Hyldig, Augustenborg, DK;
Bjarne Straede, Sydals, DK;
Danfoss A/S, Nordborg, DK;
Abstract
The method and apparatus is directed to monitoring a fluid conduit system for leaks, particularly a leakage flow of less than 25 liters per hour. After closing a main valve that fluidly connects a fluid source to the conduit system, the time is measured for the pressure in the conduit system to drop to a predetermined first value. Upon reaching the first value a shunt valve is opened and the time is measured for the pressure to rise to a second predetermined value. The leakage flow is calculated from the two measured times and the two pressures together with known constants for the control system. In place of providing the shunt valve the main valve may be partially opened. Controls for the valves are provided together with evaluating apparatus for determining the leakage volume.