Patent ID: 8800602
Filing Date: 2014-08-12
Classification: F16K,F16L,Y10T

Abstract:
1. A valve isolation tool, operable with a source of compressed gas, to block gas flow leakage occurring through a leaking valve in a gas flow duct system which system includes (a) a duct with a central bore, (b) a leaking valve in said duct, (c) a duct segment of said duct downstream of said leaking valve, (d) a vent duct which has proximal and opposite distal ends, said distal end intersecting and being in fluid communication with the central bore said duct segment, and (e) an on/off valve in said vent duct, said on/off valve having open and closed states, said valve isolation tool comprising: (1) an outer tube having proximal and distal ends, (2) an inner tube having proximal and distal ends and movable axially within said outer tube, (3) an un-inflated balloon attached to said distal end of said inner tube which is fluid coupled to said source of compressed gas, (4) a flexible cover having a proximal end securely disposed airtight about the proximal end of the inner tube, and a distal end of securely disposed airtight about the proximal end of the outer tube.