Control valve

A control valve comprising:

• a valve housing including a flow channel block with a flow channel in which a fluid flows;
• a valve assembly mounted on the valve housing to be movable in a first direction and provided with a valve body configured to change a degree of a communication opening of the flow channel;
• and
• an operation shaft including a shaft section inserted into an insertion hole formed in the valve housing and a tapered shaft section being in contact with the valve assembly,
• wherein a position of the valve body is adjusted through the tapered shaft section by motion of the operation shaft in a second direction,
• wherein the valve housing includes a valve block configured to house the valve assembly and a spring member,
• the valve block is provided with the spring member configured to apply spring force in directions of bringing the valve body away from a valve seat through the valve assembly and bringing the valve assembly to be pressed against the tapered shaft section,
• the valve body is moved to approach the valve seat to be against the spring force by change in a contact position of the valve assembly with the tapered shaft section from a smaller-diameter portion to a larger-diameter portion,
• the valve body is moved to be away from the valve seat by the spring force by change in the contact position of the valve assembly with the tapered shaft section from the larger-diameter portion to the smaller-diameter portion, and
• the degree of the communication opening of the flow channel is adjusted by motion of the valve body in the first direction moved by motion of the tapered shaft section in the second direction.