Ikinyugunyugu, kizwi kandi nka flap valve, ni valve igenzura ifite imiterere yoroshye, ishobora gukoreshwa muguhindura igenzura ryikigereranyo mu muyoboro muke. Ikinyugunyugu kinyugunyugu bivuga valve igice cyo gufunga (disiki ya valve cyangwa isahani yikinyugunyugu) ni disiki kandi ikazenguruka uruziga rwa valve kugirango ifungure kandi ifunge.