| 摘要 |
PROBLEM TO BE SOLVED: To provide a mechanism for removing foreign matter in a gate valve where a sealing material attached to a gate plate is conventionally pressed against an opening circumferential rim for retaining airtightness causing a problem of deterioration of airtightness when the foreign matter sticks to an adhering portion of the sealing material and a sealing material of the opening circumferential rim part. SOLUTION: This gate valve 1 has a casing 2 having an opening 3a, the gate plate 5 opening and closing the opening 3a, and an actuator (not illustrated) driving the gate plate 5. It is characterized by that it has a mechanism arranging brushes 13 and 14 each near a tip of the gate plate 5 and near the opening circumferential rim part for removing the foreign matter sticking to the mutually adhering portion of the gate plate 5 and the opening circumferential rim part by movement in parallel with an opening face of the opening 3a of the gate plate 5.
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