| 摘要 |
The emitter-valve includes a deformable element placed within a cavity. The element has a stem which extends within a water inlet to the cavity or a base which rests on the inlet wall on the bottom of the cavity so that, upon supply of water, the element deformably moves upward against a wall having a water outlet therein to permit water to flow to soil. A groove across the element top cooperates with an annular protuberance on the water outlet wall so that, as water pressure rises, water flow decreases and, as water pressure decreases, water flow increases. Further included are three deformable fingers of springy material which normally space the element from the water outlet and which briefly resist upward movement of the element and contact of the groove with the annular protuberance upon initial water turn-on to permit the water to spurt through the valve outlet and to carry therewith any lodged solid particulate matter. Also, upon initial water shut-off, the springy fingers suddenly move the element to permit another surge of water through the outlet as water backpressure is relieved.
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