Patent ID: 7757711

Claim:
A flow controller, comprising: a main body having a first flow path, which is communicated to a first port, and a second flow path, which is communicated to a second port; a ring packing being provided between the first flow path and the second flow path so as to seal the first flow path and the second flow path; a rod-shaped flow control member being tightly pierced through said ring packing and capable of relatively moving, in the axial direction, with respect to said ring packing, said flow control member having a third flow path, whose one end is opened at least in an outer circumferential face thereof and which communicates the first flow path to the second flow path via said ring packing, wherein flow volume of a fluid flowing in the third flow path is controlled by adjusting a position of said flow control member with respect to said ring packing; operation means for relatively moving said ring packing and/or said flow control member in the axial direction of said flow control member; a fourth flow path being provided outside of said ring packing so as to communicate the first flow path to the second flow path; and a check valve prohibiting the fluid to flow from the second flow path to the first flow path via the fourth flow path and allowing the fluid to flow from the first flow path to the second flow path via the fourth flow path, wherein the third flow path is a bifucated notch, which is formed by notching the one end of said flow control member in the axial direction and whose width is gradually increased toward the one end thereof, and a circumferential width of the end of the third flow path, which is opened in the outer circumferential face of said flow control member, is gradually increased toward the one end of said flow control member, and wherein the bifurcated notch is opened in both side faces of said flow control member, and notching depths of the bifurcated notch in the both side faces are mutually different.