This week the prototype team started working on the first deliverable – the technology recommendation. We also designed another check valve to build and try out. The pop bottle and marble check valve works well to keep water flowing in only one direction, but because it forces all the water into a smaller diameter section, it makes pumping significantly harder. So, we are investigating another check valve design that will not reduce the size of the pipe – using a thin ring and a rubber or leather flap.
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