| 摘要 |
<p>PURPOSE: To provide a method of operating a vacuum operation type shut-off valve for a vacuum waste water system, and improve a control device for operating the shut-off valve so that high reliability is secured with the compact and simple structure on a point of design. CONSTITUTION: A control device for a vacuum operation type shut-off valve for vacuum waste water system is provided with a first valve 14 to be operated by the dynamic pressure to be generated by the collected waste water and a bulkhead chamber 56, in which pressure can be adjusted by the first valve. A valve piston 24 of a second valve 20, to which spring members 71, 72 work, is arranged in the bulkhead chamber or adjacent to the bulkhead chamber freely to be moved. Low pressure reaches the shut-off valve through the second valve in response to the pressure working in the bulkhead chamber, and opens the shut-off valve, and when the dynamic pressure is not generated, the first valve is closed, and a pressure change required for closing of the second valve is generated in the bulkhead chamber.</p> |
