| 摘要 |
1492240 Reciprocating pumps SOC TECHNIQUE DE PULVERISATION 10 Aug 1976 [14 Aug 1975] 33226/76 Addition to 1323986 Heading F1A A container-mounted atomizer pump, e.g. for perfume, comprises a cylinder 1 communicating with a dip tube via inlet check valve 4 and having a piston 5 moved against a spring 11 by a fingeractuated spray button 7, a valve seat 29 being held in piston 5 by spring 11 and being engaged by an apertured valve member defined by a piston 30, the aperture communicating via hollow stem 31 with spray nozzle 8. In operation, downward movement of piston 5 pressurizes liquid in cylinder 1, the pressure acting, via passage 29b in seat 29, on the underside 30a of valve member 30. At a predetermined pressure, valve member 30 rises against spring 17 and opens communication between cylinder 1 and nozzle 8. Part 33 returns leakage past seals 6a, 6b to the container. |
