US 12,103,380 B2
Valve device
Takahiro Sakai, Kanagawa (JP); and Atsuki Teramoto, Kanagawa (JP)
Assigned to PIOLAX, INC., Kanagawa (JP)
Appl. No. 18/267,663
Filed by PIOLAX, INC., Kanagawa (JP)
PCT Filed Nov. 15, 2021, PCT No. PCT/JP2021/041933
§ 371(c)(1), (2) Date Jun. 15, 2023,
PCT Pub. No. WO2022/137887, PCT Pub. Date Jun. 30, 2022.
Claims priority of application No. 2020-212834 (JP), filed on Dec. 22, 2020.
Prior Publication US 2024/0100939 A1, Mar. 28, 2024
Int. Cl. F16K 24/04 (2006.01); B60K 15/035 (2006.01); B60K 15/03 (2006.01)
CPC B60K 15/035 (2013.01) [F16K 24/044 (2013.01); B60K 2015/03256 (2013.01); Y10T 137/3099 (2015.04)] 6 Claims
OG exemplary drawing
 
1. A valve device comprising:
a housing provided with a valve chamber configured to communicate with an inside of a fuel tank below a partition wall and a ventilation chamber configured to communicate with an outside of the fuel tank above the partition wall, and provided with an opening portion configured to communicate with the valve chamber and the ventilation chamber in the partition wall; and
a float valve accommodated in the valve chamber to be able to ascend and descend, and configured to open and close the opening portion, wherein
the float valve includes
a main float,
a sub-float held at an upper portion of the main float to be able to ascend and descend by a predetermined distance with respect to the main float, and
a sub-float biasing spring disposed between the main float and the sub-float and configured to bias the sub-float upward with respect to the main float,
the sub-float includes a spring support portion configured to support an upper end of the sub-float biasing spring and a seal portion that is configured to come into contact with and separate from the opening portion,
the housing includes a cylindrical valve seat protruding downward with respect to the partition wall in a cylindrical shape from a back side peripheral edge of the opening portion,
the main float includes a sub-float holding portion configured to retain and hold the sub-float,
a first ascent and descent guide is constituted above the float valve by the cylindrical valve seat and the sub-float holding portion, and a second ascent and descent guide is constituted below the float valve by a lower portion of the main float and the housing,
the sub-float includes
a sub-float main body including the spring support portion,
a seat valve forming the seal portion and disposed above the sub-float main body, and
a seat valve holding portion including an insertion hole and configured to retain and hold the seat valve with respect to the sub-float main body, and
the cylindrical valve seat is configured to abut against the seat valve through the insertion hole when the float valve ascends.