| 摘要 |
PROBLEM TO BE SOLVED: To provide an on-off valve with a detector, which can accurately detect a short stroke valve opening state with good responsiveness and has high durability, corrosion resistance and explosion proof.SOLUTION: An on-off valve 1 with a detector comprises an on-off valve 8 for opening and closing a flow passage with a valve element 11 contacting with and separating from a valve seat 12a, and a detector 5 for detecting the open and close states. The detector 5 comprises (a) a sleeve 14b formed with a detector valve seat 14a, (b) a detector valve rod 16 sliding in the sleeve 14b and having a detector valve element part 20a which contacts with and separates from the detector valve seat 14a in the vertical direction to the radial direction of the sleeve, and (c) a fluid state detector for detecting a fluid state which varies when the detector valve element part 20a separates from the detector valve seat 14a. |
