Valve ea heke ea thipa e loketse seretse le phaephe e mahareng e nang le faeba, 'me poleiti ea eona ea valve e ka khaola thepa ea fiber ka har'a seretse; e sebelisoa haholo ho tsamaisa slurry ea mashala, pulp ea diminerale le phaephe ea slurry ea slag ea pampiri. Valve ea heke ea thipa ke sehlahisoa sa valve ea heke, 'me e na le melemo le mathata a eona a ikhethang.1, Ke sehlahisoa sa valve se ratoang bakeng sa phaephe ea slurry, slurry le pulp. 2. Sebopeho se bonolo, bophahamo bo bonyenyane, boima bo bobebe le ho kenngoa habonolo. Mathata a valve ea heke ea thipa: e ka sebelisoa feela phaepheng ea khatello e tlase. Valve ea heke ea thipa e sebelisoa haholo phaepheng ea slurry, e ka thoeng ke valve e khethehileng bakeng sa phaephe ea slurry.