Pump dispenser for a container with a flexible bag

A dispenser for a fluid-like substance comprising:

• an outer casing having an outlet opening;
• a pump including a piston, a tubular body and an axial nozzle, activation of the piston being carried out by displacing the nozzle;
• said pump further including a vent normally closed when the piston is in its rest position, and a counter flange sealingly connecting the pump to the casing at the casing outlet opening;
• a bushing extending into the casing and comprising a sealing connection ring having a lower cylindrical skirt portion and an upper band portion connected to the skirt portion;
• said bushing also including a ferrule portion extending above the band portion and including an enlarged upper flange portion, said ferrule portion extending through said casing outlet and said flange portion arranged to support and center said bushing in said outlet;
• a flexible bag for containing fluid-like substance within the casing and including an outlet sealingly attached to the skirt portion;
• said pump tubular body including a substance flow conduit extending into said upper band portion through said ferrule portion and being sealingly connected to said band portion below said vent;
• a lower intermediate space between said bag and interior of the casing, an upper intermediate space between the pump body and the ferrule, said upper intermediate space being in communication with said vent, and a passage providing communication between said lower intermediate space and said upper intermediate space.