Dispenser for pasty compounds

A dispenser (1) for pasty compounds (M), comprising a tubular compound housing (2) having a feeding plunger (7) and a head piece (3) which is guided relative to the upper tube piece (9) and has a metering chamber (18) with which there are associated an inlet valve (35) and a mouthpiece channel (20), a spring element (25) which extends from the head piece (3) to the upper tube piece (9) being provided for the spring-back of the head piece (3) into the starting position, which extends between parallel annular walls (16, 32) of the head piece (3) and the compound housing (2) and engages there with legs (28, 29), and which opens and closes the mouthpiece channel (20) when the head piece (3) is actuated, wherein the engaging limbs (28, 29) of the spring element form a U-space which is open toward the metering chamber (18), the outer limb (29) of which continues upwardly into a sealing tongue (38) that extends into the mouthpiece channel (20), the tongue pivoting away in the opening direction in the presence of emptying pressure.