Patent ID: 11932101
Assignee: PIOLAX, INC.
Field: Transport (Mechanical engineering)
Classification: CPC B  F  G  Y | IPC B  F  G

Claim 5:
6. A valve device comprising:
a housing in which a valve chamber is provided on a lower side and a ventilation chamber is provided on an upper side via a partition wall, the valve chamber communicating with an inside of a fuel tank, the ventilation chamber communicating with an outside of the fuel tank, and the partition wall being formed with a valve hole through which the valve chamber and the ventilation chamber communicate with each other;
a float valve accommodated in the valve chamber so as to be movable up and down and configured to open and close the valve hole; and
a pressure adjusting valve configured to adjust pressure and accommodated in the ventilation chamber so as to be movable up and down,
wherein a first valve seat which the pressure adjusting valve is configured to come into contact with and separate from is formed from the valve hole toward the upper side, and a second valve seat which the float valve is configured to come into contact with and separate from is formed from the valve hole toward the lower side,
wherein an accommodation portion configured to surround and accommodate the pressure adjusting valve is provided in a protruding manner from a surface of the partition wall toward the upper side, and an internal space of the accommodation portion communicates with the valve hole,
wherein an inner periphery of the accommodation portion is provided with a reduced diameter portion positioned on a side of the partition wall and having a shape adapted to an outer periphery of the pressure adjusting valve, and an increased diameter portion positioned above the reduced diameter portion and having a shape larger in diameter than the outer periphery of the pressure adjusting valve,
wherein a height of an upper end of the reduced diameter portion from the surface of the partition wall on the side of the ventilation chamber is equal to or greater than a front surface of the pressure adjusting valve in a state where the pressure adjusting valve is in contact with the first valve seat,
wherein the pressure adjusting valve is configured to be beyond the upper end of the reduced diameter portion when the pressure adjusting valve is raised to a maximum due to an increase in pressure in the fuel tank,
wherein the increased diameter portion is provided from the upper end of the reduced diameter portion via a stepped portion,
wherein the increased diameter portion is provided with a plurality of ribs extending from the stepped portion in an axial direction of the increased diameter portion and arranged at predetermined intervals in a peripheral direction of the increased diameter portion, and
wherein inner ends of the ribs in a radial direction are formed at the same position as an inner peripheral surface of the reduced diameter portion when the accommodation portion is viewed in the axial direction.