Abstract: A dispenser for discharging liquid to pasty masses, has a pump head and a pump chamber, having a pump chamber wall and an inlet valve and an outlet valve. The pump chamber is formed by a bellows part, on which the inlet valve is integrally formed. The inlet valve is retained of retaining arms, which extend in the peripheral direction of the inlet valve and are connected to the pump chamber wall and to the inlet valve, and the inlet valve forms a peripherally extending valve lip, which freely protrudes in cross-section. The inlet valve extends in the shape of a circle segment in a longitudinal cross-section of the bellows part, having an upper dome segment and the lower valve lip. The connection to the retaining arms is formed at a height center of the inlet valve or at an offset therefrom toward a free edge of the valve lip.

Abstract: A dispenser for discharging liquid to pasty masses, has a pump head and a pump chamber, having a pump chamber wall and an inlet valve and an outlet valve. The pump chamber is formed by a bellows part, on which the inlet valve is integrally formed. The inlet valve is retained of retaining arms, which extend in the peripheral direction of the inlet valve and are connected to the pump chamber wall and to the inlet valve, and the inlet valve forms a peripherally extending valve lip, which freely protrudes in cross-section. The inlet valve extends in the shape of a circle segment in a longitudinal cross-section of the bellows part, having an upper dome segment and the lower valve lip. The connection to the retaining arms is formed at a height center of the inlet valve or at an offset therefrom toward a free edge of the valve lip.