Flap valves
Simple non-return valves, usually without springs, to ensure that a fluid passes in one direction only.
Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)
Simple non-return valves, usually without springs, to ensure that a fluid passes in one direction only.
Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)
International Association of Marine Aids to Navigation and Lighthouse Authorities - AISM
