structure of bycicle valve



One of the important items for launch of water rockets is the bycicle tire valve.
There are three types (British, French, and American), and in Japan, British type is mostly used.
About 2 kg/cm2 pressure difference, the air (the water) goes through to another side.
The item to stop flowing backward is "mushi-gomu (bug made from rubber)" that it is 15mm length.
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If you have any hints about water rocekts, please mail to me.
Ōrv@Toshihisa shibamoto tsshiba@st.rim.or.jp