| 摘要 |
PURPOSE:To certainly prevent the erroneous operation for permitting the generation of water-hammer phenomenon due to the erroneous order in the closure of a main valve body and a subvalve boy by turning a main valve shaft and a subvalve shaft by a single input shaft and allowing the interlocking of the main valve body and the subvalve body. CONSTITUTION:As for the gear parts 29 and 30 of driving gears 25 and 26, the phase is deflected so that the gear part 30 of the driving gear 26 does not mesh with a trailing gear 18 when the gear part 29 of the driving gear 25 meshes with a trailing gear 14, and the hear part 29 of the driving gear 25 does not mesh with the trailing gear 14 when the gear part 30 of the driving gear 26 meshes with the trailing gear 18. Therefore, in the course to the perfect opening from the perfect closure, a flow passage 7 is opened perfectly by a main valve body 8 after a communication hole 10 is perfectly opened by a subvalve body 13. While, in the course to the perfect closure from the perfect opening, the communication hole 10 is perfectly closed by the subvalve body 13 after the flow passage 7 is perfectly opened by the main valve body 8, and the generation of water-hammer phenomenon due to the sharp closure of the main valve body 8 is prevented. |
