Patent ID: 9492765
Filing Date: 2016-11-15
CPC Classification: B01D,B60K,F02M,F16K,Y10T

Claim Text:
1. A valve unit, comprising: a housing in which a lower valve chamber communicating with an interior of a fuel tank and an upper vent chamber communicating with an outside of the fuel tank are provided via a partition wall, the partition wall having an opening portion; a float valve which is disposed in the lower valve chamber of the housing so as to move upwards/downwards; and a check valve which is disposed within the upper vent chamber so as to move upwards/downwards, wherein a valve seat is provided along a circumferential edge of the opening portion on a lower surface side of the partition wall, and plural radially-extending thin ribs are formed around the valve seat, wherein check valve guide ribs which guide an upward/downward movement of the check valve extend axially while being connected to the partition wall and are provided at predetermined circumferential intervals on an inner circumference of the upper vent chamber, wherein the thin ribs which are formed on a lower surface of the partition wall and the check valve guide ribs which are formed on the inner circumference of the upper vent chamber are formed circumferentially alternately so as not to be superposed on each other when viewed from an axial direction of the housing, wherein, with respect to a centerline of the valve unit, radially-inward end surfaces of the thin ribs are disposed more radially inward than radially-inward end surfaces of the check valve guide ribs, wherein gate portions that are used in injection molding the housing are disposed on an upper surface side of the partition wall at plural positions which coincide with the thin ribs, and wherein axially-extending float valve guide ribs which guide an upward/downward movement of the float valve are provided at predetermined circumferential intervals on an upper portion of an inner circumference of the lower valve chamber, and upper end portions of the float valve guide ribs are connected to outer circumferential end portions of the thin ribs.