| 摘要 |
This invention concerns a drip for irrigation of constant flow, due to the fact that the hole from where the water drips, is to be found at the bottom of an atmospheric pressure tank (1), where the water level is kept constant by a needle valve consisting of a float (3) bearing a needle (3A) at the top, whose purpose is to close the water hole blocking the flow of water under pressure coming from the water supply. The rate of discharge therefore from the drip, according to the invention, results constant, on account of the water head, in turn maintained constant, under which the discharge hole lies (4A).
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