| 摘要 |
A self venting drain valve (10) for a fuel filter/water separator unit or other air tight fluid container is disclosed. The valve includes a arcuately elongated fluid hole (18) and a vent hole (20) in a lower wall (12) of the unit. A cylindrical movable member (36) is mounted for rotational movement on a pivot post (16) which extends downward from the unit. The movable member includes an upper planar face (40). A arcuately elongated slot (42) in the movable member is in fluid connection with a liquid outlet (46). The movable member also includes an air passage (48) in communication with an air intake (52). In a first rotational position the movable member blocks liquid flow out of the unit as well as air flow into the unit. In a second rotational position, the fluid hole on the unit is in communication with the liquid outlet opening of the movable member while the air flow into the unit remains blocked. In a third rotational position, the fluid hole in the wall is fully aligned with the elongated slot on the movable member while the air passage on the movable member is aligned with the vent hole in the unit. This enables air to enter the unit and the liquid to readily escape through the liquid outlet of the movable member.
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