| 摘要 |
PURPOSE:To prevent partial abrasion of bearings by composing a substantially rectangular frame-like valve body of a valve part which opens or closes a bypass passage, a counterweight part and supporting parts, and rotatably supporting a valve shaft divided into two in a cantilever form to a body. CONSTITUTION:A valve main body is a substantially rectangular frame composed of a valve part 7a which opens and closes a valve opening 16 of a bypass passage 17, a counterweight part 7b, and supporting parts 7c, 7d bridged between both ends of the valve part 7a and the counterweight part 7b. A valve shaft 6 is composed of divided shafts 6a, 6b whose reversal, ends are rotatably supported in a cantilever form by means of a body 4 through bearings 8, 5, while whose opposing ends are installed on a substantial intermediate position between the supporting parts 7c and 7d of the valve body 7. The valve part 7a and the counterweight 7b of the valve body 7 are symmetrically arranged along an axis of the valve shaft 6 bringing about well-balanced condition. Partial abrasion of the bearings after long use is reduced or prevented in respect to the bearings. |
