PURPOSE: To effect an efficient operation of an equipment to produce water from moisture in gas using an adsorbent by a method wherein solenoid valves are installed at both the inlet and outlet sides and these are simultaneously controlled from a control section.

CONSTITUTION: Solenoid valves are used to change a container section 1a having adsorbent 1 from adsorption route to desorption route so that required number of solenoid valves 20, 21 can be simultaneously switched from a controller 22. In adsorption process, solenoids 20d, 21d of the solenoid valves 20, 21 are not energized; in desorption process both solenoids 20d, 21d are energized. This eliminates the generation of time-shift of open/close between valves thereby enabling an efficient operation and reducing the work number for equipment operation.