Control valve

A control valve comprising:

• a body having a lead-in port through which a fluid is led in, a lead-out port through which the fluid is led out, and a valve hole provided in a fluid passage joining the lead-in port to the lead-out port, wherein a valve seat is provided in an opening end of the valve hole;
• a valve element that opens and closes a valve section by touching and leaving the valve seat from an upstream side and blocks flow of the fluid between an upstream passage and a downstream passage in the fluid passage when the valve section is closed;
• and
• an actuating rod that operates to open and close the valve section,
• the valve element having:
• a flexible sealing member whose one side surface touches and leaves the valve seat as a sealing surface;
• and
• a support member that supports the sealing member with the sealing surface exposed toward the valve seat and is driven in opening and closing directions of the valve section by actuatin the actuator,
• wherein the support member includes a supporting surface, which is in contact with a side surface of the sealing member opposite to the sealing surface of the sealing member, and an engagement part, which supports a peripheral edge part of the sealing member in a manner such that the engagement part is engaged with the peripheral edge part thereof from an opposite side of the supporting surface, and
• wherein a ring-shaped fluid flow passage is formed between the supporting surface of the support member and the sealing member, and the fluid flow passage communicates with the upstream passage.