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A a drip irrigation system comprises a hose with a flexible wall circumscribing and bounding a main flow-path for carrying irrigation fluid, and pressure-compensated emitters spaced along the length of the hose and providing a communicating channel between the main flow-path and a region at lower pr

A a drip irrigation system comprises a hose with a flexible wall circumscribing and bounding a main flow-path for carrying irrigation fluid, and pressure-compensated emitters spaced along the length of the hose and providing a communicating channel between the main flow-path and a region at lower pressure outside the main flow-path, such as the region outside the hose, the pressure-compensating function of the emitters producing a flow-rate through the emitters that is weakly dependent on the pressure differential across the emitters. The pressure compensated emitters comprise one slit extending through the flexible wall, the slit interrupting the circumferential stresses in the flexible wall when the flow-path is pressurized, the stress interruption simultaneously causing a dilatation of the slit and an outwardly radial displacement in the single wall material adjacent to, and around the slit, and protrusions connected to the flexible wall and extending from the perimeter of the slit towards the main flow-path to form an outwardly diverging discharge channel with an inlet facing the inward fluid region, the outwardly diverging discharge channel connecting the inward fluid region to the slit, the protrusions narrowing the cross-sectional area of the inlet to increase the hydrodynamic resistance of the discharge channel in response to both the dilatation of the slit and to the outward displacement of the wall material adjacent to and around the slit.

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A a drip irrigation system comprises a hose with a flexible wall circumscribing and bounding a main flow-path for carrying irrigation fluid, and pressure-compensated emitters spaced along the length of the hose and providing a communicating channel between the main flow-path and a region at lower pr

A a drip irrigation system comprises a hose with a flexible wall circumscribing and bounding a main flow-path for carrying irrigation fluid, and pressure-compensated emitters spaced along the length of the hose and providing a communicating channel between the main flow-path and a region at lower pressure outside the main flow-path, such as the region outside the hose, the pressure-compensating function of the emitters producing a flow-rate through the emitters that is weakly dependent on the pressure differential across the emitters. The pressure compensated emitters comprise one slit extending through the flexible wall, the slit interrupting the circumferential stresses in the flexible wall when the flow-path is pressurized, the stress interruption simultaneously causing a dilatation of the slit and an outwardly radial displacement in the single wall material adjacent to, and around the slit, and protrusions connected to the flexible wall and extending from the perimeter of the slit towards the main flow-path to form an outwardly diverging discharge channel with an inlet facing the inward fluid region, the outwardly diverging discharge channel connecting the inward fluid region to the slit, the protrusions narrowing the cross-sectional area of the inlet to increase the hydrodynamic resistance of the discharge channel in response to both the dilatation of the slit and to the outward displacement of the wall material adjacent to and around the slit. ul; US-5919428, 19990700, Gao et al.; US-5935458, 19990800, Trapani et al.; US-5938944, 19990800, Baughman et al.; US-5990028, 19991100, Roethlingshoefer; US-6025034, 20000200, Strutt et al.; US-6076742, 20000600, Benary, 239/081; US-6245390, 20010600, Baranovski et al., 219/076.14