Imishini yemitha - isihlukanisi sokugcoba esiqhubekayo semigqa emibili siklanywe ngamapayipi amabili okuhlinzeka kanye nezindawo ezimbili zokuphuma, lapho ingcindezi ku-valve ehlukanisayo ifinyelela esigabeni sokusetha, imbobo eyodwa yokuphuma iqala ukukhipha amafutha noma uwoyela kuze kube yilapho ihlangabezana nokucindezela kokushintsha kwe-valve, okuvumela enye indawo ukuthi ikhiphe ngenye indlela.
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