| http://www.w3.org/ns/prov#value | - As shown in this embodiment, the valves 3816 are duck bill valves, however, in other embodiments, the valves 3816 can be any passive or active valves, including but not limited to, ball check valves, flapper valves, volcano valves, umbrella valves, a poppet, a controlled valve or other types of valves used in the art.
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