Abstract: A sequentially activated multi-diaphragm foam pump for a foam dispenser includes a housing with a liquid pump portion and air pump portion secured. The liquid pump portion has a liquid inlet and valve, a liquid pump diaphragm, a liquid outlet and outlet valve. The air pump portion has a first and second air inlet and air inlet valve, a first and second air pump diaphragm, and a first and second air outlet. The foam pump also includes a mixing chamber that is in fluid communication with the liquid outlet, the first second air outlets. The liquid pump diaphragm, the first and second air pump diaphragms, operate in sequential order and the foamy mixture is dispensed through an outlet that is in fluid communication with the mixing chamber.

Abstract: A sequentially activated multi-diaphragm foam pump for a foam dispenser includes a housing with a liquid pump portion and air pump portion secured to the housing. The liquid pump portion has a liquid inlet, a liquid inlet valve, a liquid pump diaphragm, a liquid outlet valve, and a liquid outlet. The air pump portion has a first and second air inlet, a first and second air inlet valve, a first and second air pump diaphragm, and a first and second air outlet. The sequentially activated multi-diaphragm foam pump also includes a mixing chamber that is in fluid communication with the liquid outlet, the first air outlet, and the second air outlet. The liquid pump diaphragm, the first air pump diaphragm, and the second air pump diaphragm operate in sequential order.