| 摘要 |
A pressure build-up pump sprayer to be interconnected with a liquid filled container and having a poppet assembly including inner and outer coaxially aligned pressure chambers. The inner pressure chamber communicates with the orifice outlet of the sprayer, and the outer pressure chamber is initially filled with air. Prior to priming the sprayer, an air-tight seal isolates the inner and outer pressure chambers from one another. During the priming cycle, the air-tight seal is broken and air trapped within the outer pressure chamber is exhausted through the orifice outlet by way of the inner pressure chamber. The outer pressure chamber is then filled with liquid that is sprayed therefrom through the orifice outlet during a downstroke of the liquid dispensing cycle. During a subsequent upstroke of the liquid dispensing cycle, the outer pressure chamber is refilled with liquid, and excess liquid at the orifice outlet is pulled into the inner pressure chamber under suction to avoid clogging the orifice outlet as a consequence of a build-up of dry liquid residue.
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