| 摘要 |
PROBLEM TO BE SOLVED: To prevent a valve seat from being deformed because of deformation in a seat member by dint of pressing of a plug by connecting this seat member provided with the valve seat to the plug tight enough. SOLUTION: A lower hole 32 and an upper hole 33 formed in the inner part of a plug 3 are set apart by means of a partition wall part 34 provided with a communicating hole 35. In addition, an external thread part made up on an outer circumferential surface of the upper end of a seat member 2 is screwed in an internal thread part made up on an inner circumferential surface of the lower end of the lower hole 32, and thereby this seat member 2 is connected to the plug tight enough. In a closed state, a valve element 41 takes a valve seat 22, but in an open state, this valve element 41 separates from the valve seat 22, whereby fuel taken into a mounting hole 11 from a hole 13 passes through each space among a cave 25, a guide hole 21, the valve seat 22 and the valve element 41, flowing into a storage chamber R, and then it is returned to a fuel tank T via the communicating hole 35. With this constitution, there is no need to press and lock the seat member 2 to a bottom face of the mounting hole 11 with the plug 3, therefore this seat member 2, namely, the valve seat 22 will in no case be deformed at all, and thus hermetrical sealability lying between the valve seat 22 and a valve element 41 is improvable into a high degree. |
