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:
Aug. 28, 2001
Filed:
Jan. 25, 1999
Applicant:
Inventors:
David J. Balke, Morton Grove, IL (US);
Jacques E. Hoffmann, Lincolnwood, IL (US);
Assignee:
Intertech Corporation, Skokie, IL (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01M 3/04 ;
U.S. Cl.
CPC ...
G01M 3/04 ;
Abstract
A method of, and apparatus for, determining leakage in a valve or the like which is not dependent on bulk modulus of the fluid is described. The test apparatus includes a pressure transducer which measures the change in pressure along a length of pipe (XY) from the valve under test to a second valve for a period of time. The effect of bulk modulus of the test fluid is eliminated by placing a volume of gas between the pressure transducer and the section XY of pipe. Leakage is determined by measuring the change in pressure at the transducer over a period of time after the valve under test is closed.