PURPOSE: To operate each module at about the same filtration rate by keeping the filtration side of each module of the filter modules, wherein several modules are connected in series, at a specified pressure.
CONSTITUTION: N numbers of modules A1, A2,...An having the same performance (desalting efficiency, permeability etc.) are connected in series. The filtrate pressure (filter chamber pressure) of each module is equalized to the pressure difference Pk-n between the original liquid inlet pressure Pk of the module Ak and the original liquid inlet pressure Pn of the module An at the lowermost stream by controlling the pressure regulating valve Vk (k=1, 2,...n-1, and n is excluded) in the filter chamber of each module Ak. The modules are operated under such control. This control is usually performed automatically by using a constant pressure valve.
KAMIYAMA YOSHIYASU
NAKAGOME KEISUKE
MATSUMOTO SHIGENORI
