clapper valve clappers • clapping · · · Info · Definitions · Synonyms · Characters · · clapper valve · · Text Common · · Latin · · Scripts 13 · · Length 3 · · Syllables Definitions · · · (noun) a simple valve with a hinge on one side; allows fluid to flow in only one direction. Synonyms: clack valve, clack, clapper valve. · · Noun Definition 1 Synonyms · · · clack valve · · Synonym 1 clack · · Synonym 2 Characters · · space U+0020 a latin small letter a U+0061 c latin small letter c U+0063 e latin small letter e U+0065 l latin small letter l U+006C p latin small letter p U+0070 r latin small letter r U+0072 v latin small letter v U+0076