Patent ID: 7771176

Claim:
A micropump with a pump membrane which can be moved to modify the volume of a pump chamber which is adjacent to the pump membrane and a base part, also comprising two valves which are arranged in recesses in the base part and react to the pressure in the pump chamber in order to alternately open and close an inlet channel and an outlet channel for a medium to be pumped, wherein the valves are formed without any common components by standalone functioning valve modules comprising a valve seat and a valve body, wherein the valve modules ( 40 , 41 ) consist of only a seat component ( 12 ) forming the valve seat and a spring component ( 13 ) forming the valve body, and wherein the seat component has a recess formed by a rim heightening ( 21 ) of a floor plate ( 20 ), wherein the rim heightening ( 21 ) projects from the floor plate ( 20 ) in the through-flow direction of the valve, wherein the rim heightening ( 21 ) is integrally connected with the floor plate ( 20 ), and wherein the spring component ( 13 ) placed in the recess and located adjacent the rim heightening ( 21 ) is centered by the rim heightening ( 21 ), wherein the spring component ( 13 ) is connected with an annular rim portion to the floor plate ( 20 ), and wherein a side of the spring component ( 13 ) facing away from the floor plate ( 20 ) is entirely free.