Control method for pure water production system

Abstract

When the amount of water usage at each use point decreases and the amount of water supply to sub systems 4A, 4B, 4C becomes lower than a reference value, if the amount of water supply is reduced by throttling each of control valves 60A, 60B, 60C, the water supply pressure at a pressure meter 59 increases. Therefore, a control means reduces, on the basis of the measurement value from the pressure meter 59, the output of a high pressure pump 52B through inverter control such that the measurement value at the pressure meter 59 becomes substantially constant with respect to a predetermined value. In addition, when the amount of water usage at each use point increases and the amount of water supply to the sub systems 4A, 4B, 4C becomes higher than the reference value, the amount of water supply is increased by opening each of the control valves 60A, 60B, 60C. This reduces the water supply pressure at the pressure meter 59. Therefore, the control means increases, on the basis of the measurement value at the pressure meter 59, the output by the high pressure pump 52B through inverter control such that the measurement value at the pressure meter 59 becomes substantially constant with respect to a predetermined value. Such a control method for a pure water production system allows for control of the amount of water supply according to the amount of water usage.

Dependencies are inferred from the claim text.