| 摘要 |
<p>PROBLEM TO BE SOLVED: To eliminate disturbance of water supply system caused by drop in the flow rate of supply water. SOLUTION: When a switching timing signal 44 is inputted from a switching timing detection means 41 to a switching decision means 42, a stop selection signal 45 is taken in from a stopping pump selection means 43 and a switching signal is delivered to a switching means 21 on the stopping side while a full-open command signal is delivered to a flow control means 22. An r.p.m. control means 14 on the stopping side controls the r.p.m. of a turbine driven water supply pump on the stopping side to match an r.p.m. command signal on the operating side in order to avoid abrupt drop of intake flow rate thus blocking delivery of an abrupt open signal.</p> |
