Outlet valve arrangements for enhanced pump efficiency

A dispenser comprising:

• a housing;
• an actuator located within the housing;
• a holder for holding a container of soap, sanitizer or lotion;
• a sequentially activated multi-diaphragm pump having a plurality of pump chambers;
• the pump having an inlet, the plurality of pump chambers, and an outlet;
• the plurality of pump chambers comprising at least one liquid pump chamber;
• the at least one liquid pump chamber having a pump chamber volume that is the volume of the expanded pump chamber;
• a first outlet valve located downstream of the at least one pump chamber;
• a second outlet valve located downstream of the first outlet valve;
• a conduit located between the first outlet valve and the second outlet valve;
• the conduit having a conduit volume that is the volume of the area between the first outlet valve and the second outlet valve;
• and
• an outlet nozzle;
• wherein, the conduit volume is greater than the pump chamber volume.

A dispenser for dispensing soap, sanitizer or lotion comprising:

• a housing;
• a container having a liquid outlet located proximate the bottom of the container disposed in the housing holding a soap, a sanitizer or a lotion;
• an outlet nozzle;
• and
• a sequentially activated multi-diaphragm pump having a plurality of pump chambers;
• the pump disposed between the container and the outlet nozzle, the pump having:
• a pump inlet in fluid communication with the container;
• a pump outlet in fluid communication with the outlet nozzle;
• at least one liquid pump chamber of the plurality of pump chambers is in fluid communication with the pump inlet and the pump outlet, wherein the liquid pump chamber is movable between an expanded position and a compressed position;
• a fast acting check valve disposed between the pump outlet and the outlet nozzle
• a slow acting check valve disposed between the fast acting check valve and the outlet nozzle;
• wherein the fast acting check valve opens and closes more times than the slow acting check valve during a dispense of fluid from the dispenser.