| 摘要 |
A drip irrigation hose includes a plurality of emitter elements secured to a tube at longitudinally-spaced locations to define, with an inner surface of the tube, a plurality of labyrinths each having an inlet in communication with the interior of the tube, and an outlet in communication with a tube outlet for discharging water from the tube outlet at a slow rate. The labyrinths are defined by a continuous strip bonded to the inner surface of the tube, and including a relatively elastic material shaped to define at least the tips of a group of teeth for each of the emitter elements, and a rib extending transversely across a part of the flow path from the respective emitter inlet to the respective tube outlet. Each of the latter ribs is formed with a slit which automatically opens when the water pressure within the tube at the respective emitter unit reaches a predetermined minimum to permit flow from the respective emitter inlet to the respective tube outlet. |
