| 摘要 |
<p>An automatic constant pressure lift valve device for maintaining a downstream side fluid pressure at a predetermined value by adjusting in a one-touch fashion a set of predetermined external pressure applying means mounted on a pilot valve device comprising an A valve portion and a B valve portion. The automatic constant pressure lift valve device prevents, due to the construction of its main valve structure, the occurence of an extraordinary pressure increase phenomenon in the fluid pressure on the downstream side not only when equipment such as storage/conveying pump is started or stopped but also while it is continuously run. In addition, the device provides watertightness without any difficulty when water supply is stopped. Furthermore, the device is characterized in that there is provided no stationary throttle adjusting flow path such as a needle valve in the pilot valve device portion. In addition, the device is characterized in that when clogging takes place in the main valve portion and the A and B valve portions in the pilot valve device, unclogging is effected by automatically opening the valves and generating self cleaning flow. Thus, the automatic constant pressure lift valve device is greatly advantageous in industrial applications.</p> |
