| 摘要 |
The invention relates to a manual, self-priming precom- pression spray pump (100), which employs a minimal number of differ- ent parts. The entire assembly (100) includes a container for the liquid which is to be dispensed, a cap (120) for closing the open end of the con tainer, a conventional spray nozzle unit (104), a valve member (400), a piston (600), a spring (700) and a cylinder (500) for housing the piston (600) and providing a compression chamber (516). The valve upper end functions as an outlet valve (402) and the valve lower end functions as an inlet valve (414). The spring (700) is a compound spring and serves two, independently variable functions. It serves both to force the valve outlet end (402) into a constant sealing engagement with the interior of the piston (600), and to resist the compression movement of the pis- ton (600). The compound spring (700) has one end seated on the seat (510), which is formed where the inner concentric valve cylinder (50~) is joined to the outer cylinder (500), the piston housing cylinder (500).
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