Abstract: A control device for metering fluid flow from a remote location is shown in conjunction with an insecticide spraying apparatus. The spraying apparatus includes a compressed air source feeding pressurized air to a nozzle for mixing with a liquid and discharge to atmosphere. A metering pump feeds the liquid to the nozzle in response to a digitized input signal received from a remote control device. A digitized feedback signal including a number of pulses per unit time from the metering pump to the remote control device indicates the rate of flow of the liquid through the metering pump. The remote control device compares the digitized feedback signal with a control voltage to generate the digitized input signal which is a pulse-width modulated signal, which digitized input signal maintains the flow rate of the liquid. A pressure switch connected to the nozzle insures a predetermined pressure therein before the metering pump will begin feeding liquid to the nozzle.

Abstract: A viscous liquid dispenser is characterized by a yieldable lever arm pivotally connected within a casing. The lever arm carries a rigid dispensing block thereon. In response to the imposition of an actuating force to the lever arm, the arm pivots to bring the tip of the dispensing block into contact with a resilient flexible tube extending from a viscous liquid reservoir. The resilient tube is constricted between the tip of the dispensing block and a predetermined impact point located on a movable back-up block provided adjacent to the resilient tube and opposite from the dispensing block. The lever arm yieldably responds to the continued application of an actuating force to compress a portion of the resilient tube immediately below the constriction between the dispensing block and a predetermined dispensing surface disposed on the back-up block.