To inhibit the fall-down of a poppet 20 while preventing the blockage of a clearance between an outer peripheral face of a cylindrical part 21 of the poppet 20 and an inner peripheral face of a housing 13 by contaminants and the like.
This check valve 12 has the housing 13 having a flow channel F4, and the approximately cylindrical bottomed poppet 20 accommodated movably in the longitudinal direction L1 of the flow channel 4 and having a cylindrical part 21 and a bottom part 22. A seating face 23 capable of being seated on a seating surface 14 of the housing 13 is formed on the bottom part 22. A plurality of projecting parts 27 projecting radially outwardly, are formed on an outer periphery of the cylindrical part 21 intermittently in the circumferential direction and the axial direction.
Hiromichi Kobayashi
Tomioka Kiyoshi