| 摘要 |
The anti-return valve is mounted between two channel sections and has a housing (1) with a bore (2) for the passage of a fluid. In the housing freely oscillates a flap, of monobloc construction, biassed to a closed position by its weight and opened by the lifting effect of fluid pressure. The bore situated in the housing can be central with respect to the outer diameter of the housing. The flap can be mounted in recesses sized to allow free movement of the flap.
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