Patent ID: 7004733

Claim:
A piston pump comprising a pump housing ( 2 ), a pump piston ( 14 ) that is supported so that can slide in the pump housing ( 2 ), an inlet valve ( 22 ), an outlet valve ( 24 ), a compression chamber ( 20 ) provided in the pump housing ( 2 ) between the inlet valve ( 22 ) and the outlet valve ( 24 ), the compression chamber ( 20 ) increasing in size during an intake stroke of the pump piston ( 14 ) and decreasing in size during a compression stroke of the pump piston ( 14 ), a pressure chamber ( 31 ) disposed downstream of the outlet valve ( 24 ), and a flexible wall ( 32 , 32 a , 32 b ) that delimits the pressure chamber ( 31 ) in relation to an opposing chamber ( 36 ), wherein a pressure in the pressure chamber ( 31 ) acts on the flexible wall ( 32 , 32 a , 32 b ), the flexible wall ( 32 , 32 a , 32 b ) having an elastically resilient diaphragm ( 32 b ) of a spring-elastic material supported in an elastically flexible body ( 32 a ) of a rubber-elastic material, the rubber-elastic material being considerably softer than the spring-elastic material.