Ive built hand pumps with goodall type valves on the discharge side,once you
get the "fit" correct for the tubing works well..they will not work on the
suction side.suction side valve must be lowest possible resistance to
flow,and that means ball valve.I also tried goodall type as a boiler
clack,very good! absolutely leak free. but again needs to be very carefully
sized so that flow resistance is as low as possible the silicone tube
internal diameter should be about0.002 smaller than the sleeve.

                                       Gordon Watson
 

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