Ikinyugunyugu kinyugunyugu, kizwi kandi nka flap valve, ni valve igenga imiterere yoroshye, ishobora gukoreshwa muguhindura uburyo bwo kugenzura imiyoboro mito mito.Ikinyugunyugu kinyugunyugu bivuga valve igice cyo gufunga (disiki ya valve cyangwa isahani yikinyugunyugu) ni disiki kandi ikazenguruka uruziga rwa valve kugirango ifungure kandi ifunge.