Abstract: A backpack agricultural sprayer has a pressure vessel mounted within a container and connected to a high pressure piston pump to force liquid into the pressure vessel from which it may be discharged for spraying. Leakage of liquid past the sprayer pump is contained by a leak-proof diaphragm which defines an agitation chamber connected by a conduit to the interior of the sprayer container. The diaphragm and piston are connected to be operated together to provide two separate but simultaneously acting pumps. The piston pump pressurizes the pressure vessel, and the diaphragm pump forces liquid back and forth between the container and diaphragm chamber to agitate contents of the container. An unique piston skirt is clamped by a single bolt between a skirt retainer and a piston body to provide a unitary assembly of diaphragm, piston body, skirt and skirt retainer. The skirt is resiliently urged outwardly to improve sealing and compensate for wear.

Abstract: A pressure vessel for a backpack agricultural sprayer is mounted within a container of the sprayer and connected to the sprayer pump so that liquid from the container is forced under pressure into the pressure vessel for a spraying discharge therefrom. Leakage of liquid past the piston of the sprayer pump is contained by a leak proof diaphragm in a diaphragm chamber which is connected by a conduit to the interior of the sprayer container. The diaphragm is connected to the piston to be operated therewith thus providing two separate but simultaneously acting pumps. The first pump is the piston pump for pressurizing the liquid for spraying discharge. The second pump is the diaphragm which forces liquid back and forth between the container and the diaphragm chamber in a high velocity stream which agitates the contents as the stream is projected into the container interior.

Abstract: A garden sprayer for dispensing pressurized liquids has a pressure vessel mounted within a liquid reservoir container. The pressure vessel carries a diaphragm pump which is detachable as a complete unit and which extends from the container for connection to a pivoted actuating lever that is fulcrumed on the container. The diaphragm, which is directly driven by the pivoted lever, is guided in position and orientation by a guide piston fixed to the diaphragm and slidably guided within the pumping chamber. A pair of input and output check valves, mounted at the end of the pump, permit liquid from the container to be drawn into the pumping chamber and to be forced from the pumping chamber into the pressure vessel. A manually controlled valve on a spray nozzle, which is connected to the pressure vessel, controls pressurized discharge of liquid.

Abstract: A pressure vessel for a backpack agricultural sprayer is mounted within a container of the sprayer and connected to the sprayer pump so that liquid from the container is forced under pressure into the pressure vessel for a spraying discharge therefrom. Sediment precipitated from herbicides or insecticides employing wettable powders tends to collect at the bottom of the pressure vessel and a combined sediment agitating and pressure regulating action is provided by a pressure regulator valve mounted in the pressure vessel and having a suction tube connected between the valve and the area of the pressure vessel where the precipitated sediment collects.

Abstract: A garden sprayer for dispensing pressurized liquids has a pressure vessel mounted within a liquid reservoir container. The pressure vessel carries a diaphragm pump which is detachable as a complete unit and which extends from the container for connection to a pivoted actuating lever that is fulcrumed on the container. The diaphragm, which is directly driven by the pivoted lever, is guided in position and orientation by a guide piston fixed to the diaphragm and slidably guided within the pumping chamber. A pair of input and output check valves, mounted at the end of the pump, permit liquid from the container to be drawn into the pumping chamber and to be forced from the pumping chamber into the pressure vessel. A manually controlled valve on a spray nozzle, which is connected to the pressure vessel, controls pressurized discharge of liquid.