Static metering pump

A static metering pump comprising a pair of tanks, tube means connecting said tanks at the upper portions thereof for equalization of pressure within said tanks, a pair of electrically-operated intake valves disposed, one each, at upper portions of said tanks, a pair of electrically-operated outlet valves disposed, one each, at lower portions of said tanks, respective outlet tubes communicating with the outlet valves of each of said tanks and communicating with a common discharge tube, upper and lower liquid sensor means disposed on each of said tanks for sensing pre-set selected full levels and empty levels in said tanks, and forming therebetween a normal pre-set liquid cavity of equal volume in each of said tanks, said cavities being sized to contain a normal pre-set volume of liquid, circuit connection means interconnecting said inlet valves, said outlet valves and said upper and lower liquid level sensor means, with said upper and lower liquid level sensor means and said circuit connection means being adapted to open and close said valves in order to permit filling said first tank from an external source of liquid while discharging liquid from said second tank and then permitting discharging liquid from said first tank while filling said second tank, electrically-operated control means for permitting a preselected number of tank filling and discharge cycles to be performed automatically until a total selected volume of liquid is dispensed from both tanks, representing a multiple of said normal pre-set volumes, after which operation of said static metering pump is stopped, thereby permitting the dispensing of a preselected volume of liquid, and an adjustable fractional liquid level sensor disposed on one of said tanks intermediate said upper and lower liquid sensors for sensing a selected fractional filled level for said one tank at the commencement of the metering operation, said control means being adapted to commence the metering cycles by the discharge of said one tank.