| 摘要 |
PROBLEM TO BE SOLVED: To provide a structure capable of preventing detachment of a seal member in a control valve in which a flexible seal member is used for sealing a valve part.SOLUTION: A valve body 44 has: a packing 56 whose single side face is attached to and detached from a valve seat 28 as a seal face 140; and a support member 52 supporting the packing 56 and driven in an opening/closing direction of the valve part by an operation of an actuator. The support member 52 includes a support face 134 contacting a face of the packing 56 opposite to the seal face 140, and an engagement part 136 engaged with a peripheral edge of the packing 56 and supporting the peripheral edge. An annular fluid flow passage is formed between the support face 134 of the support member 52 and the packing 56, and is communicated with an upstream side passage. |
