The invention relates to a device for dispensing a fluid including: a tank arranged so as to contain the fluid; a dispensing pipe arranged so as to guide the fluid in a dispensing direction; a dispensing opening connecting the tank to the dispensing pipe; a dispensing valve which, in an open state, allows fluid to pass from the inside of the tank to the dispensing pipe via the dispensing opening and, in a closed state, does not allow fluid to pass from the inside of the tank to the dispensing pipe; and a return means arranged so as to exert a force on the dispensing valve. Said force moves the dispensing valve from the open state thereof to the closed state thereof. The return means includes a pouch forming a cavity. Said pouch is located in the dispensing pipe. The shape of the pouch is changed via compression when the dispensing valve is in the open state.

A pump body structure includes: an air inlet cylinder, an air inlet cavity being arranged inside the air inlet cylinder, and an air return hole being arranged in a bottom portion of the air inlet cylinder; a liquid inlet cylinder connected to the bottom portion of the air inlet cylinder; a lower cover connected to the bottom portion of the air inlet cylinder, a cavity being defined by the lower cover, an outer side wall of the liquid inlet cylinder and a bottom wall of the air inlet cylinder, and an air return channel being reserved between the lower cover and the liquid inlet cylinder; and an elastic stop valve arranged in the cavity, the elastic stop valve being configured for elastically covering a bottom portion of the air return hole.