U-igice cyikinyugunyugu ni kashe ya Bidirectional, imikorere myiza, agaciro gake ya torque, irashobora gukoreshwa kumpera yumuyoboro kugirango usibe valve, imikorere yizewe, impeta yikimenyetso hamwe numubiri wa valve bihujwe hamwe, kugirango valve ifite ndende ubuzima bwa serivisi