PUMP-SPRAYER WITH MANUAL DRIVE Russian patent published in 1999 - IPC

FIELD: agriculture, in particular, supplying of liquid under pressure onto plants. SUBSTANCE: pump-sprayer has step pump with step opening. Spherical member serving delivery valve is positioned for axial displacement within step opening and hollow spraying stem with nozzle is fixed in this opening. Stem end inserted into pump is made flattened. Gap defined between stem end and pump walls provides permanent communication between stem and cylinder. Pump side wall has openings. Delivery valve is positioned in stem through cavity so as to prevent sealing member from movement on pump. EFFECT: increased efficiency and improved wear-resistance of delivery valve. 2 dwg