초록 ▼

A backflow prevention valve includes a cylindrical case member having a plurality of holes formed in an upper end at a periphery thereof, a valve member disposed in the case member to be movable in an axial direction thereof, an urging device disposed in the case member for urging the valve member u

A backflow prevention valve includes a cylindrical case member having a plurality of holes formed in an upper end at a periphery thereof, a valve member disposed in the case member to be movable in an axial direction thereof, an urging device disposed in the case member for urging the valve member upwardly, and a liquid inflow pipe extending outwardly from the case member. The valve member includes a sealing portion at an upper surface thereof for contacting a peripheral edge of an inflow opening to close the same, and a plurality of guiding arms provided on a peripheral edge of an upper surface of the valve member. The guiding arms are slidably disposed in the holes so that the valve member is supported and guided by the guiding arms passing through the holes.

대표청구항 ▼

1. A backflow prevention valve attached to a fuel supply pipe for preventing a backflow of fuel, comprising:a cylindrical case member having a peripheral wall, an inflow opening formed at one end, an outlet formed in at least one of the other end and the peripheral wall, and a plurality of holes for

1. A backflow prevention valve attached to a fuel supply pipe for preventing a backflow of fuel, comprising:a cylindrical case member having a peripheral wall, an inflow opening formed at one end, an outlet formed in at least one of the other end and the peripheral wall, and a plurality of holes formed in an upper end at a periphery thereof,a valve member disposed in the case member to be movable in an axial direction thereof and having a sealing portion at an upper surface thereof for contacting a peripheral edge of the inflow opening to close the same, and a plurality of guiding arms provided on a peripheral edge of an upper surface of the valve member, said guiding arms being slidably disposed in the holes so that the valve member is supported and guided by the guiding arms passing through the holes,an urging device disposed in the case member for urging the valve member toward the inflow opening, anda liquid inflow pipe extending outwardly from the case member around the inflow opening and having a smooth inner surface to allow the fuel to smoothly flow through the backflow prevention valve.2. A backflow prevention valve according to claim 1, further comprising a plurality of guiding slots provided on an outer peripheral surface of the liquid inflow pipe for receiving the guiding arms so that the valve member is supported and guided by the guiding arms passing through the holes and sliding in the guiding slots.3. A backflow prevention valve according to claim 2, wherein said case member has a shoulder portion at the upper end thereof, said holes being formed in the shoulder portion.4. A backflow prevention valve according to claim 1, wherein said sealing portion includes a circular main member having a size less than that of an upper portion of the cylindrical main member, and a circular projection wall protruded on an upper surface of the main member to constitute a sealing portion.5. A backflow prevention valve according to claim 4, wherein said circular main member further includes a conical member projecting outwardly from a center of the circular main member.6. A backflow prevention valve according to claim 4, wherein said cylindrical main member includes a partition wall, said sealing portion being attached above the partition.7. A backflow prevention valve according to claim 1, further comprising a covering member attached to a bottom of the case member, said urging device being disposed on the covering member.