Abstract: The invention relates to a pressure control arrangement for a breast pump system comprising a first pressure chamber; a first opening for receiving milk, the first opening being in connection with the pressure chamber and the first opening being arranged to have a first tube connected to the first opening; a second opening in connection with the pressure chamber, the second opening being arranged to have a second tube connected to the second opening for connecting the pressure chamber to an under pressure source; and a third opening for delivering milk to a container, the third opening comprising a first valve for closing the pressure chamber if the pressure in the pressure chamber is substantially lower than on the other side of the third opening. By providing the first pressure chamber in combination with the first valve, a space with substantially constant size is provided at each pumping cycle.

Abstract: The invention relates to a pressure control arrangement for a breast pump system comprising a first pressure chamber; a first opening for receiving milk, the first opening being in connection with the pressure chamber and the first opening being arranged to have a first tube connected to the first opening; a second opening in connection with the pressure chamber, the second opening being arranged to have a second tube connected to the second opening for connecting the pressure chamber to an under pressure source; and a third opening for delivering milk to a container, the third opening comprising a first valve for closing the pressure chamber if the pressure in the pressure chamber is substantially lower than on the other side of the third opening. By providing the first pressure chamber in combination with the first valve, a space with substantially constant size is provided at each pumping cycle.