| 摘要 |
The prevent invention comprises a non-returning pipe, pressure controller and pressure-resisting ring respectively, whose larger ring-shaped side exactly resists the water inlet edge of the non-returning pipe, in which some interlinked vents are designed on the larger ring-shaped side while a leakage-proof pad on the ladder-shaped side for the pressure-resisting ring. In that way, the pressure-resisting ring is pushed towards the pressure control and the leakage-proof pad exactly would be absorbed by the vacuum at the edge of central hole in the case of water's access to the non-returning pipe. And the pressure-resisting ring can eliminate the vacuum absorption with its gravity and air suction to form an unobstructed water flow and block backward the water inlet edge of the non-returning pipe to prevent the water flow's reflux from access to the interior of the non-returning pipe for longer service life of water transport pipeline and balance the returning water operation safety. Thereby, it not only would not easily be involved in denaturation and failure, but also has simple structure and exact operation besides its easy assembly.
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