| 摘要 |
PURPOSE: A valve of dual disc structure is provided to open a valve smoothly by adopting dual disc structure having the same direction as the direction of the fluid flowing in the valve. CONSTITUTION: A fluid pressure is used for perfect sealing between a disc(6) and a seat(5) when a valve is closed. In an opening process of the valve, an auxiliary disc(8) at the center of the disc is opened to keep the balance of the pressure between an inlet and an outlet of the valve. Thereby, the main disc is smoothly opened. For this, an auxiliary seat is polished through a hole at the center of the main disc. Then, the disc is manufactured to correspond to the auxiliary seat. When the auxiliary disc is opened higher than a stroke, the main valve disc is automatically opened. The dual disc structure of the valve is mounted by simple change in the shape of the valve disc. Therefore, the valve is completely closed by a small force and the leakage of oil is prevented.
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