Discharger for a flowable medium

A discharger for a flowable medium comprising:

• a housing having a discharge opening;
• a pumping device disposed in said housing and having a pumping chamber;
• a piston disposed adjacent a first side of said pumping chamber and being movable relative to said housing;
• a gas-impermeable and flexible diaphragm defining part of said pumping chamber and hermetically sealing said pumping chamber on said first side from an environmental atmosphere outside said discharger, said diaphragm having a marginal region fixedly connected to said housing;
• an inlet duct in communication with said pumping chamber and with a supply of medium;
• an inlet valve disposed in said pump chamber, said inlet valve movably disposed on said inlet duct for opening and closing said inlet duct;
• an outlet duct in communication with said discharge opening and with said pumping chamber, said inlet duct and said outlet duct both being disposed on a second side of said pumping chamber opposite said first side;
• and
• an actuating element disposed adjacent said first side of said pumping chamber and operatively connected to said piston and movable with said piston toward said inlet duct, said actuating element contacting said inlet valve to open said inlet duct as said piston moves toward said inlet duct.