Kutheni ukhetha iivalvu zesango?

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1. Ukumelana nokuhamba kwamanzi okuphantsi kunye nomlinganiselo ophantsi wokuxhathisa ukuhamba kwamanzi

Xa ivalvu yesango ivuliwe ngokupheleleyo, umjelo womzimba wevalvu ufana nobubanzi bangaphakathi bombhobho, kwaye amanzi anokudlula phantse kumgca othe tye ngaphandle kokutshintsha indlela yokuhamba. Ke ngoko, ukumelana nokuhamba kwayo kuncinci kakhulu (ikakhulu ukusuka kumphetho wepleyiti yevalvu), kwaye ukulahleka kwamandla kuncinci, okwenza ukuba ifaneleke kakhulu kwiinkqubo ezineemfuno ezingqongqo zokwehla koxinzelelo.

2. I-torque yokuvula nokuvala incinci kakhulu, kwaye ukusebenza kulula kakhulu.

Ekubeni indlela yokuhamba kwepleyiti yesango ihambelana ngqo nendlela amanzi ahamba ngayo, ngexesha lenkqubo yokuvula nokuvala, amandla asetyenziswa luxinzelelo lwamanzi kwipleyiti yesango ahambelana ne-axis ye-valve stem. Oku kubangela ukuba kubekho i-torque encinci okanye i-thrust efunekayo ukuze kusebenze (ingakumbi kwiipleyiti zesango ezihambelanayo), okwenza kube lula ukusebenza ngesandla okanye ukuvumela ukusetyenziswa kwe-actuator enamandla aphantsi.

3. Ukuhamba kweendlela ezimbini, akukho miqathango yendlela yokufaka

Indlela yokungena kwevalvu yevalvu yesango idla ngokuyilwa ngokulinganayo, ivumela amanzi ukuba angene evela macala omabini. Olu phawu luthetha ukuba ukufakelwa akufuneki kuqwalasele icala lokuhamba kwesixhobo, okubonelela ngoyilo oluguquguqukayo kwaye lufanelekile nakwiipayipi apho icala lokuhamba linokutshintsha khona.

4. Ukukhukuliseka okuncinci komphezulu wokuvala xa uvuliwe ngokupheleleyo

Xa ivalvu ivuliwe ngokupheleleyo, isango liphakanyiswa ngokupheleleyo liye kwinxalenye ephezulu yomngxuma wevalvu kwaye lahlulwe kwindlela yokuhamba kwamanzi. Ke ngoko, ukuhamba kwamanzi akuwukhukulisi ngokuthe ngqo umphezulu wokutywina, ngaloo ndlela kwandisa ubomi benkonzo yomphezulu wokutywina.

5. Ubude besakhiwo obufutshane kakhulu

Xa kuthelekiswa neentlobo ezithile zeevalvu (ezifana neevalvu zeglobe), iivalvu zesango zinobude obufutshane bolwakhiwo, nto leyo ebanika ithuba kwiimeko apho indawo yokufaka incinci.

6. Uluhlu olubanzi lokusetyenziswa okuphakathi

Izinto ezahlukeneyo kunye neendlela zokutywina zingakhethwa ngokweemeko zokusebenza ezahlukeneyo. Ifanelekile kwiindidi ezahlukeneyo ezifana namanzi, ioyile, umphunga, igesi, kwanamasuntswana aqulethe udaka. Ngaphambi kokuba kuqanjwe ivalvu yebhola kunye nevalvu yebhabhathane, ivalvu yesango yayiyeyona ndlela iphambili yokukhetha ivalvu kwizityalo zamanzi, izityalo zamandla kunye namashishini eekhemikhali. Ngenxa yobubanzi obukhulu bombhobho ovulekileyo kunye nendawo eyaneleyo yokufaka ngokuthe nkqo, yayisetyenziswa kakhulu kwimibhobho ephambili eyayingasebenzi rhoqo.