Control valve device

Patent Pending To provide a control valve device wherein the accuracy in opening and closing of a valve is improved. The control valve device 300 has a valve body 310 having a valve body head 310a, a power transmission member 320a for transmitting power to the valve body, a valve box 305 in which the valve body is slidably stored, a first bellows 320b which defines a first space Us at a position on the opposite side of the power transmission member to the valve body, a second bellows 320c which defines a second space Ls at a position on the side of the power transmission member to the valve body, a first pipe 320d which communicates with the first space, and a second pipe 320e which communicates with the second space.