| 摘要 |
A trigger actuated pump sprayer has a discharge valve assembly (54) located in the discharge barrel (41) of the pump body (21). The discharge valve assembly (54) includes an elastomeric valve disc (55) in sealing engagement with the inner wall (56) of the barrel (41). A filler sleeve (61) is located in the barrel (41) to reduce the volume of the discharge barrel thereby displacing the air therein whereupon the strokes-to-prime ratio of the pump required during initial pumping for discharging pressurized liquid along the barrel and through the orifice at a nozzle end thereof, is improved. Also the discharge valve assembly (54) may be shiftable along the length of the discharge barrel in response to pressure and return strokes during pumping, a downstream end of the assembly engaging a spin mechanics element (48) at the nozzle end to therewith define a variable volume suction chamber in communication with the discharge orifice (44) for withdrawing product therefrom during each pumping suction stroke. <IMAGE> |
