| 摘要 |
<p>The invention relates to a non-return device 12 which may be used for waste and or odour traps for domestic plumbing. The device comprises a housing 18 for connection between a fluid inlet 14 and a fluid outlet 16 and a flexible non-return valve 26 positioned within the housing. The non-return valve has an inlet opening through which fluid enters the valve, and an outlet through which fluid exits the valve. The fluid outlet is defined by a pair of opposing wall members 28, 30. Opposing closure devices 40 are arranged such that each clamps a respective lateral edge of the outlet. The wall members are moveable between open and closed conditions. In the open condition the wall members define a passageway for fluid to flow out of the valve from the inlet. In the closed condition the wall members are in face to face contact to prevent fluid flow from the outlet to the inlet. The non return valve may be made by injection moulding.</p> |
