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Yokohama Waterworks Commemoration Hall / Various tangentiai-flow-impeller water meters1

Yokohama was the first city in Japan in which a modern waterworks system was constructed. The Yokohama Waterworks Commemoration Hall and Waterworks Technology Commemoration Hall displays materials and videos that present how Yokohama's waterworks system was developed. (For more information, see the February 2010 issue of the PR magazine pla-topia.) http://www.city.yokohama.lg.jp/suidou/kyoku/torikumi/suidou-pr/kinenkan/

Water feed system Water meter1 Various tangential-flow-impeller water meters1 Joint and steel pipe Water meter2 Various tangential-flow-impeller water meters2 Branching devices Water meter3 Various tangential-flow-impeller water meters3 Auxiliary stop cock1 Auxiliary stop cock2

The current tangential-flow-impeller water meters are now in use as compact water meters.
Water meters of this type use the current flowing into the inlet to rotate the impeller inside the case and integrate the rotations of the impeller via a gear.
Current tangential-flow-impeller water meters are classified into two types - single-case type and multiple-case type.
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Column
	Types of water meters		Plastic parts making up a tangential-flow-impeller water meter
	Current tangential-flow-impeller type		Auxiliary stop cock