Water pump with check valve

A water pump comprising:

• an impeller arranged in a pump chamber;
• a motor operatively connected to the impeller to drive the impeller;
• a suction socket and a pressure socket, wherein water is sucked in through the suction socket into the pump chamber and discharged from the pump chamber through the pressure socket when the impeller is driven;
• a check valve comprising a valve body movable in a direction of a valve axis of the check valve between an open position of the check valve and a closed position of the check valve;
• an actuating device connected with the check valve and comprising an operating element movable coaxially to the valve axis;
• the operating element operatively connected to the valve body and arranged such that the operating element, when manually actuated, applies a coaxial force to the valve body and transfers the valve body into a venting position of the check valve for a filling process of the water pump;
• wherein the actuating device comprises a frictional fixation of the operating element, wherein the frictional fixation of the operating element generates a fixation force, wherein the fixation force is greater than a pretensioning force of the check valve and solely the fixation force maintains the venting position of the check valve when the operating element has been actuated;
• wherein the fixation force is smaller than a constructively defined restoring force acting on the check valve when switching off the water pump and the constructively defined restoring force automatically forces the check valve into the closed position without requiring a manual release of the actuation device.