Umehluko phakathiAma-valve evemvane aseShayinanamavalvu ebhola aseShayina: Qonda izici nokusetshenziswa kwalawa mavalvu amabili avamile
Emishinini yokulawula uketshezi,Ama-valve evemvane aseShayina kanye nama-valve ebhola aseShayina ayizinhlobo ezimbili ezivamile zamavalvu. Nakuba zihluka ngesakhiwo kanye nendlela yokusebenza, zonke zidlala indima ebalulekile ezinhlobonhlobo zezicelo zezimboni. Lesi sihloko sizohlola izici nokusetshenziswa kwalawa ma-valve amabili ngokombono wochwepheshe.