Pump, has hose removed from article after terminating pumping operation, where pressure in lifting rod and inner pipe is deaerated automatically from hose by transverse-running air duct, so that meter is automatically returned to zero

摘要

The pump has a hose (60) whose one end is coupled to a base part (41) of a cylinder arrangement (40) and another end is coupled to an article to be pumped. A pressure meter (51) measures an air pressure value in a lifting rod of the cylinder arrangement. The hose is removed from the article after terminating the pumping operation, where pressure in the lifting rod and an inner pipe is deaerated automatically from the hose by a transverse-running air duct, so that the pressure meter is automatically returned to zero.