Iivalvu zokulawula ukuhambabadlale indima ebalulekileyo ekuqinisekiseni ukusebenza ngokufanelekileyo nangokukhuselekileyo kweenkqubo ezahlukeneyo kwicandelo lamandla. Ezi zivalo zilawula ukuhamba kwamanzi, njengamanzi, umphunga, kunye negesi yendalo, kuluhlu olubanzi lwezicelo, kubandakanywa ukuveliswa kwamandla, ukuveliswa kweoli kunye negesi, kunye nokucocwa. Ngokwandisa ulawulo lokuhamba, ezi zivalo zinegalelo ekongeni amandla amakhulu, ukunciphisa ukukhutshwa kwezinto ezikhutshwayo, kunye nokuphucula ukuzinza kwenkqubo.
Kwizityalo zamandla, iivalvu zolawulo lokuhamba zizinto ezibalulekileyo kwiinkqubo ezahlukeneyo, kubandakanywa iiinjini zomphunga, iisistim zamanzi okutya, kunye neenkqubo zokupholisa amanzi. Ulawulo lokuhamba oluchanekileyo lubalulekile ekugcineni uxinzelelo kunye nobushushu bomphunga, ukuqinisekisa ukusebenza ngokufanelekileyo kweinjini yomoya, kunye nokuthintela umonakalo wesixhobo. Ngokusebenzisa iivalvu zolawulo lokuhamba okuhamba phambili, izityalo zamandla zinokufezekisa ukuphuculwa okuphawulekayo ekusebenzeni kwamandla, okukhokelela ekunciphiseni ukusetyenziswa kwamafutha kunye neendleko zokusebenza eziphantsi.
Iziko lombane elikhulu eMelika liphucule inkqubo yalo yokulawula i-injini yomphunga ngeevalvu zokulawula ukuqukuqela okukrelekrele. Ezi zivalo, zixhotyiswe ngee-sensor eziphambili kunye ne-actuators, zibonelele ngokujongwa kwexesha langempela kunye nohlengahlengiso oluchanekileyo lokuhamba komphunga. Ngenxa yoko, umzi-mveliso wamandla uphawule ukonyuka kwe-2% ekusebenzeni kakuhle kwe-injini yomoya, ukuguqulela kukongiwa kwamafutha ngonyaka kwi-1 yezigidi zeedola.
Kwishishini le-oyile kunye negesi, iivalvu zokulawula ukuhamba zidlala indima ebalulekileyo ekulawuleni ukuhamba kwamanzi ngexesha lemveliso, ukuthutha kunye nokucubungula. Ukuphucula ulawulo lokuhamba kuncedisa ekunyuseni kwemveliso ye-wellhead, ukunciphisa ilahleko yoxinzelelo kwimibhobho, kunye nokuphucula ukwahlula kakuhle kwiindawo zokulungisa. Ngokunciphisa ukusetyenziswa kwamandla kunye nokwandisa imveliso yemveliso, iivalve zokulawula ukuhamba zifaka isandla kwinzuzo yonke yokusebenza kweoli kunye negesi.
Umsebenzisi wendawo yeoli kuMbindi Mpuma uphumeze inkqubo ebanzi yolawulo lokuqukuqela kuyo yonke imveliso yayo. Ngokusebenzisa i-valve yokulawula ukuhamba okuphezulu kunye nezicwangciso zokulawula eziphambili, umqhubi uzuze ukunyuka kwe-5% kwimveliso ye-wellhead, okubangelwa i-10,000 imibhobho yeoli eyongezelelweyo ngosuku.
Kwiindawo zokucoca kunye nezityalo zokucubungula, iivalve zokulawula ukuhamba zibalulekile ekugcineni ulawulo oluchanekileyo phezu kokuhamba kwamanzi kwiinkqubo ezahlukeneyo, kubandakanywa i-distillation, i-crack, kunye nokudibanisa. Ulawulo lokuhamba oluchanekileyo luqinisekisa umgangatho ophezulu wemveliso, ukunciphisa ukusetyenziswa kwamandla, kwaye kuthintele ukuchitheka okunobungozi kunye nokuvuza. Ngokufaka igxalaba ekusebenzeni ngokufanelekileyo nangokuhambelana nokusingqongileyo, iivalvu zolawulo lokuqukuqela zidlala indima ebalulekileyo kuzinzo lokusulungekiswa nokusetyenzwa kweshishini.
Indawo esulungekileyo eYurophu iphumeze iprojekthi yokutshintsha iivalvu zokulawula ukuhamba okwaluphalayo ngeemodeli zangoku, ezonga amandla. Iivalve ezintsha zibonelela ngolawulo olungqongqo lokuhamba kunye nokunciphisa ilahleko yoxinzelelo, okukhokelela ekunciphiseni kwe-10% ekusebenziseni amandla. Oku kuncitshiswa kokusetyenziswa kwamandla kuguqulelwe ekunciphiseni okubonakalayo kwi-greenhouse gas emissions, ebonisa iingenelo zokusingqongileyo kubuchwepheshe obuphambili bokulawula ukuhamba.
Iivalvu zokulawula ukuqukuqela azikho nje iinxalenye zoomatshini; zibenza bakwazi ukusebenza kakuhle kunye nozinzo kwicandelo lamandla. Ngokuphucula ulawulo lokuhamba, ezi zivalo zinegalelo ekunciphiseni ukusetyenziswa kwamandla, ukukhutshwa okuphantsi, kunye nokuphucula ukuzinza kwenkqubo. Njengoko icandelo lezamandla litshintshela kwikamva elicocekileyo nelizinzileyo, izivalo zolawulo lokuqukuqela ziya kuqhubeka ukudlala indima ebaluleke kakhulu ekuphumezeni ezi njongo.