Uchungechunge lwama-valve ama-overcenter aphindwe kabili. Ngala ma-valve kungenzeka ukuphatha imithwalo ye-bidirectional, ukuqinisekisa ukuzinza endaweni yokusebenza nokulawula ukunyakaza kwabo ngisho nalapho kukhona imithwalo yamandla adonsela phansi engakhiqizi ingcindezi. I-valve ...