When I was a kid, our bike valves consisted of a hollow tube that extended from the outside(where a pump would be attached) to the inside of the tube.
A rubber tube like in the above image slid over this tube, so that when you pumped air, it would go into the tube, and when the pressure was off, the tube would be sealed.
I haven't seen that sort of valve for probably 40 years, but all the repair kits out of China have two pieces of valve rubber as shown.
Guess the original repair kit that was copied by the Chinese had two rubber valves, and so every repair kit since has had them.
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