Functional water producing apparatus and functional water producing method

Abstract

A functional water producing apparatus in an embodiment includes: a water pressure regulator configured to regulate the water pressure of the ultrapure water, the water pressure regulator having a pressure regulating valve configured to regulate a water pressure of the ultrapure water to an almost constant pressure and a feed water pump configured to pressurize the ultrapure water; a dissolving device configured to dissolve functional gas imparting a specific function in the ultrapure water regulated the water pressure by the water pressure regulator; and a control device configured to control the feed water pump to regulate the water pressure of the functional water to a predetermined constant pressure based on a water pressure or a flow rate of the functional water flowing out of the dissolving device.

What is claimed is: 
     
         1 . A functional water producing method to produce functional water by using ultrapure water, comprising:
 a pressure regulation and pressurization step having a pressure regulation step of regulating a water pressure of ultrapure water to an almost constant pressure with a pressure regulating valve and a pressurization step of pressurizing the ultrapure water with a feed water pump; and   a dissolution step of dissolving functional gas imparting a specific function in the regulated ultrapure water at the pressure regulation and pressurization step.   
     
     
         2 . The method according to  claim 1 , further comprising a control step of controlling the feed water pump based on a water pressure or a flow rate of the functional water flowing out of the dissolving device so that the water pressure of the functional water is kept at a predetermined constant pressure. 
     
     
         3 . The method according to  claim 1 , wherein the pressure regulation and pressurization step comprising:
 the pressure regulation step of regulating a water pressure of ultrapure water to an almost constant pressure; and   the pressurization step of pressurizing the ultrapure water regulated the water pressure at the pressure regulation step.   
     
     
         4 . The method according to  claim 1 , wherein the pressure regulation and pressurization step comprising:
 the pressurization step of pressurizing ultrapure water; and   the pressure regulation step of regulating a water pressure of the ultrapure water pressurized at the pressurization step, to an almost constant pressure.   
     
     
         5 . The method according to  claim 2 , further comprising:
 a water pressure measurement step of measuring the water pressure of the functional water flowing out of the dissolving device,   wherein at the control step, the feed water pump is controlled based on the water pressure of the functional water measured at the water pressure measurement step so that the water pressure of the functional water is kept at a predetermined water pressure.   
     
     
         6 . The method according to  claim 2 , wherein the pressure regulation and pressurization step comprising:
 the pressure regulation step of regulating a water pressure of ultrapure water to an almost constant pressure; and   the pressurization step of pressurizing the ultrapure water regulated the water pressure at the pressure regulation step.   
     
     
         7 . The method according to  claim 2 , wherein the pressure regulation and pressurization step comprising:
 the pressurization step of pressurizing ultrapure water; and   the pressure regulation step of regulating a water pressure of the ultrapure water pressurized at the pressurization step, to an almost constant pressure.