Ko te Valver Exchance he waahanga nui o te punaha whakamahana, i te nuinga o te waa i waenga i te huringa rokiroki wai me te epioporator. Ko te huringa whanui ka hanga i te kirihou wai ki te pāmahana waenga me te pehanga teitei ka maroke i te pāmahana iti me te aukati i te wera i roto i te epiporator kia tutuki ai te wera. Ko te huringa whanui e whakahaere ana i te rere o te superheat i te mutunga o te evaporator hei aukati i te aukati o te rohe evpoporator me te ahuatanga o te patuki i te cylinder
Ko noa iho, ko te Valve ExcVe e hangaia ana ko te tinana, te paanga o te pāmahana me te ngongo toenga
Ko te ahua pai o te Valve Valve me huri i te whakatuwheratanga i te waa tūturu me te whakahaere i te reanga rere me te huringa o te kawenga evaporator. Engari i runga i te meka, na te hysterresis o te whakawhiti wera i roto i te pāmahana totoro, ko te urupare o te Valve Valve ko te haurua o te whiu. Mena ka tuhia e tatou he hoahoa o te waa-rerenga o te Valve Valve, ka kitea e maatau ehara i te pihi maeneene, engari he raina wavy. Ko te kounga o te valve hora e whakaatuhia ana i te kaha o te ngaru. Ko te nui ake o te kaha, ko te tere o te urupare o te Valve me te kino o te kounga
