Dispensing tool assembly for evacuating and charging a fluid system

摘要

A generally cylindrical body supports an outlet tube on which is mounted a resilient annular sealing member adapted to be inserted into the tubular inlet fitting of a liquid coolant system. The body also supports a set of arcuate collar sections which surround the sealing member and are cammed inwardly for gripping external threads on the inlet fitting in response to axial movement of a first air actuated annular piston surrounding the outlet tube. The sealing member is expanded radially outwardly into sealing engagement with the inlet fitting in response to axial movement of a second air actuated annular piston confined between the outlet tube and the first piston. A tubular valve member is supported for axial movement within the body in alignment with the outlet tube and moves in response to a third air actuated annular piston for selectively connecting the passage within the outlet tube to a suction passage for evacuating the coolant system and then to a liquid supply passage for filling the system.