Home  > Pavilion

Yokohama Waterworks Commemoration Hall / Auxiliary stop cock2

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

Many types of plastic are used for the internal parts of a lever type (ball valve type) auxiliary stop cock. The bucket for housing the ball valve is made of polyoxymethylene (POM). The commercial name for that is "DURACON." The cap packing in the white area in the photo is made of polyethylene.

Column
	Types of water meters		Plastic parts making up a tangential-flow-impeller water meter
	Current tangential-flow-impeller type		Auxiliary stop cock