To provide a channel change-over valve controlling water flow of a plurality of systems by delivery/drain of water and not having an on/off trouble due to interruption of electricity supply or the like and a problem on explosion prevention property.
This valve comprises a valve main body and a channel change-over rod capable of sliding and moving along a rod hole formed in the valve main body. A piston chamber having water connection passages on both ends is formed in the valve main body, and a water supply passage and a plurality of water drain passages are formed along a moving direction of the channel change-over rod respectively. A piston sliding and moving in the piston chamber is provided as one unit on the channel change-over rod. A water connection passage of which one end is opened to the water supply passage and of which the other end is opened in such a manner that the same can oppose to any of the plurality of water drain passages in accompany with movement of the flow change-over rod is provided in the channel change-over rod. Consequently, a structure is simplified, and channel change-over control of a plurality of systems is enabled, change-over action of the valve is not disturbed even if an electric power trouble such as interruption of service occurs, and it is not necessary to add a structure for explosion prevention separately.
TANAKA MAYUMI
TOIDA KATSU
KAJIMA CORP
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