Pressurized bag-in-bottle liquid dispensing system

A fluid dispenser system, comprising:

• a supply bottle including an outer shell having an open mouth and pressure port formed therein at spaced locations, and a deformable inner liner within said outer shell and connected to said outer shell generally at said mouth to permit fluid flow into and from said inner liner through said mouth, said outer shell and inner liner cooperatively defining a pressure chamber therebetween in flow communication with said pressure port;
• a supply station for receiving and supporting said supply bottle, and including means for connecting a pressure source via said pressure port to said pressure chamber thereby pressurizing said inner liner and fluid contained therein;
• a delivery conduit connected to said bottle mouth for pressure-caused flow of the fluid from said inner liner;
• dispenser control means for regulating fluid flow through said delivery conduit;
• and
• a metering unit mounted in-line along said delivery conduit and operable for permitting pressure-caused flow of the fluid therethrough in predetermined metered volumes, said dispenser control means being for operating said metering unit;
• said metering unit comprising a rotatable core having a generally diametrically extending metering cylinder extending therethrough with a metering piston received slidably within said cylinder, and said control means comprising means for moving said core to a position disposed generally in-line with said delivery conduit whereby fluid within said inner liner is permitted to flow under pressure to said cylinder to displace said piston to a downstream end of said cylinder while filling the residual volume of said cylinder with a metered volume of the fluid, said core moving means including means for rotating said core to reverse the orientation of said cylinder relative to said delivery conduit and thereby move said piston to an upstream end of said cylinder, whereby said metered volume of the fluid within said cylinder is discharged to said delivery conduit for dispensing and a subsequent metered fluid volume is permitted to flow under pressure from said inner liner to said cylinder to again displace said piston to the downstream end of said cylinder.