Valve unit for a cistern comprising a valve housing , a water supply channel arranged in the valve housing with an inlet and an outlet , a control element , and an inlet valve arranged in the water supply channel , wherein the control element is operatively connected to the inlet valve in such a way that the inlet valve can be actuated by the control element , wherein the control element has a control rocker which can be moved between a first stable position (P1) and a second stable position (P2), wherein in the first stable position (P1) the inlet valve is actuated by the control rocker such that the inlet valve is in a closed position and wherein in the second stable position (P2) the inlet valve is actuated by the control rocker such that the inlet valve is in a flow-through position, wherein the inlet valve has a valve chamber and a valve bore which forms part of the water supply channel , characterized in that the inlet valve also has a valve tappet , wherein the valve tappet projects from the valve chamber into the valve bore and can be moved from a closed position into a flow-through position, wherein a membrane element extends from the valve tappet to the wall of the valve chamber and divides the valve chamber into a first chamber area and a second chamber area , wherein the first chamber area is part of the water supply channel and wherein the valve bore adjoins the first chamber area , wherein the membrane element has a through hole which allows the second chamber area to be filled with flush water from the first chamber area , wherein the second chamber area has a control valve with a valve body and a control bore , wherein the valve body is formed onto the control rocker , and wherein, when the control valve is open, the membrane element with the valve tappet can be moved from a closed position into a flow-through position in the direction of the second chamber area due to the water pressure in the first chamber area . a valve housing , a water supply channel arranged in the valve housing with an inlet and an outlet , a control element , and an inlet valve arranged in the water supply channel , wherein the control element is operatively connected to the inlet valve in such a way that the inlet valve can be actuated by the control element , wherein the control element has a control rocker which can be moved between a first stable position (P1) and a second stable position (P2), wherein in the first stable position (P1) the inlet valve is actuated by the control rocker such that the inlet valve is in a closed position and wherein in the second stable position (P2) the inlet valve is actuated by the control rocker such that the inlet valve is in a flow-through position, wherein the inlet valve has a valve chamber and a valve bore which forms part of the water supply channel , characterized in that the inlet valve also has a valve tappet , wherein the valve tappet projects from the valve chamber into the valve bore and can be moved from a closed position into a flow-through position, wherein a membrane element extends from the valve tappet to the wall of the valve chamber and divides the valve chamber into a first chamber area and a second chamber area , wherein the first chamber area is part of the water supply channel and wherein the valve bore adjoins the first chamber area , wherein the membrane element has a through hole which allows the second chamber area to be filled with flush water from the first chamber area , wherein the second chamber area has a control valve with a valve body and a control bore , wherein the valve body is formed onto the control rocker , and wherein, when the control valve is open, the membrane element with the valve tappet can be moved from a closed position into a flow-through position in the direction of the second chamber area due to the water pressure in the first chamber area . <EOS>