| 摘要 |
PROBLEM TO BE SOLVED: To minimize leakage of fluid from a valve.SOLUTION: A valve housing 20 formed with a main fluid passage 22 in which a valve element 11 is arranged, and a rod insertion hole 32 through which a valve element driving rod 12 is inserted, is formed with a first steam recovery passage 34 opened to the inner peripheral surface of the rod insertion hole and sucking main steam that flows into the rod insertion hole from the main fluid passage to recover the main steam; a sealing steam supply passage 35 opened to the inner peripheral surface of the rod insertion hole, in a position outside in an axial direction A on the basis of an opening of the first steam recovery passage, and supplying sealing steam of high pressure from the outside into the rod insertion hole; and a second steam recovery passage 36 opened to the inner peripheral surface of the rod insertion hole, in a position outside in the axial direction A on the basis of an opening of a sealing steam supply passage, and sucking steam in the rod insertion hole to recover the steam. |
