1. Ivalvu yesango: Ivalvu yesango isho ivalvu enengxenye yokuvala (isango) ehamba ngendlela eqondile ye-eksisi yesiteshi.Ngokuyinhloko isetshenziswa njengendlela yokusika epayipini, okungukuthi, evuliwe ngokugcwele noma evalwe ngokugcwele.Ngokuvamile, ama-valve esango akufanele asetshenziselwe ukulawula ukugeleza.Ingasetshenziselwa ukucindezela kokushisa okuphansi noma ukushisa okuphezulu nokucindezela, kuye ngokuthi i-valve impahla.Kodwa ama-valve esango ngokuvamile awasetshenziselwa ukudlulisa udaka nezinye izinto ezisetshenziswayo epayipini.
Izinzuzo:
(1) ukumelana noketshezi oluncane;
② Itorque edingekayo ukuqalisa nokuvala incane;
(3) Ingasetshenziswa ekugelezeni okuphakathi kuya ohlangothini olubili lwenethiwekhi yenethiwekhi yendandatho, okungukuthi, ukugeleza kwe-medium akukhawulelwe;
(4) uma ivuleke ngokuphelele, indawo yokuvala iguguleka into yokusebenza incane kunevalvu yokumisa;
Isakhiwo somumo silula, ubuchwepheshe obuhle bokukhiqiza;
Ubude besakhiwo bufushane.
Ububi:
(1) Ubukhulu nobude bokuvula kukhulu, indawo yokufaka edingekayo nayo inkulu;
(2) ngesikhathi sokuvula nokuvala, ukungqubuzana okuhlobene kwendawo yokuvala uphawu, ukulahlekelwa ukungqubuzana kukhulu, futhi kulula ukubangela isenzakalo sokuhuzuka ezingeni lokushisa eliphezulu;
(3) I-valve yesango evamile inezindawo ezimbili zokuvala, ekucubunguleni, ekugayeni nasekunakekeleni kwandise ubunzima obuthile;
④ Isikhathi eside sokuvula nokuvala.

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