| 摘要 |
PURPOSE:To secure an equal level of fed pressure between the high and low ground level sides with a simple constitution and a simple operation, by keeping a fixed level for a pressure gauge set at the pump discharge side by means of a control valve and deciding the pump discharge pressure from the fixed value of the pressure gauge. CONSTITUTION:A pump discharge valve 3 is provided at the discharge side of a pump 2, and the pipeline at the pump discharge side is branched to the high and low ground level sides 4a and 4b. The tap water is supplied via the supply valves 9 and 10 at the high and low ground level sides respectively. A pressure gauge 19 is set at a place where the pipelines join at the discharge side of the pump 2; while a pressure control valve 8 of the low ground level side and a pressure gauge 7 are provided to the supply pipeline at the low ground level side. The signals of both gauges 19 and 7 are supplied to a terminal pressure controller 18, and the target pressure value 17a of the low ground level is delivered to a pressure control part 13 from an arithmetic part 17 of the controller 18. Then the value 17a is collated with the pressure signal 7a of the gauge 7, and a pressure deviation signal 13a is delivered to the valve 8. The opening amount of the valve 8. The opening amount of the valve 8 is controlled to obtain the coincidence between the signal 7a and the value 17a. The part 17 delivers the target water pressure value 17b also to a pressure control part 16. The water pressure deviation signal 16a is delivered to a pressure distributing part 15 to obtain the coincidence between the value 17b and the feed pipeline pressure signal 19a of the gauge 19. |
