Umahluko ophambili phakathi kwevalvu yokunciphisa uxinzelelo kunye nevalvu yokhuseleko

1. Ivalvu yokunciphisa uxinzelelo yivalvu enciphisa uxinzelelo lokungena ukuya kuxinzelelo oluthile olufunekayo lokukhupha ngokulungelelanisa, kwaye ixhomekeke kumandla esixhobo ngokwayo ukugcina ngokuzenzekelayo uxinzelelo lokukhupha oluzinzileyo. Ngokwembono ye-fluid mechanics, ivalvu yokunciphisa uxinzelelo yinto ethintela ukuxinana kwayo okunokutshintshwa, oko kukuthi, ngokutshintsha indawo yokukhupha, isantya sokuhamba kunye namandla e-kinetic okukhupha ulwelo ziyatshintshwa, nto leyo ebangela ukulahleka koxinzelelo okwahlukeneyo, ukuze kufezekiswe injongo yokunciphisa uxinzelelo. Emva koko xhomekeka kuhlengahlengiso lwenkqubo yolawulo kunye nolawulo ukuze kulinganiswe ukuguquguquka koxinzelelo lwe-post-valve kunye namandla entwasahlobo, ukuze uxinzelelo lwe-post-valve luhlale luhleli ngaphakathi koluhlu oluthile lweempazamo.

2. Ivalvu yokhuseleko yinxalenye yokuvula nokuvala ekwimeko eqhelekileyo yokuvalwa phantsi kwesenzo samandla angaphandle. Xa uxinzelelo oluphakathi kwizixhobo okanye kumbhobho lunyuka ngaphezu kwexabiso elichaziweyo, luya kuthintela uxinzelelo oluphakathi kumbhobho okanye kwizixhobo ukuba ludlule ixabiso elichaziweyo ngokukhupha i-medium ngaphandle kwenkqubo. Iivalvu ezikhethekileyo. Iivalvu zokhuseleko ziivalvu ezizenzekelayo, ezisetyenziswa kakhulu kwiibhoyila, kwimikhumbi yoxinzelelo kunye nemibhobho, ukulawula uxinzelelo ukuba lungadluli ixabiso elichaziweyo, kwaye zidlala indima ebalulekileyo ekukhuseleni ukhuseleko lomntu kunye nokusebenza kwezixhobo.

2. Umahluko ophambili phakathi kwevalvu yokunciphisa uxinzelelo kunye nevalvu yokhuseleko:
1. Ivalvu yokunciphisa uxinzelelo sisixhobo esinciphisa i-medium enoxinzelelo oluphezulu iye kwi-medium enoxinzelelo oluphantsi. Amaxabiso oxinzelelo kunye nobushushu akwinqanaba elithile.
2. Iivalvu zokhuseleko ziivalvu ezisetyenziselwa ukuthintela iibhoyila, imikhumbi yoxinzelelo kunye nezinye izixhobo okanye imibhobho ukuba ingonakaliswa ngenxa yoxinzelelo olugqithisileyo. Xa uxinzelelo luphezulu kancinci kunoxinzelelo oluqhelekileyo lokusebenza, ivalvu yokhuseleko iya kuvula ngokuzenzekelayo ukunciphisa uxinzelelo. Xa uxinzelelo luphantsi kancinci kunoxinzelelo oluqhelekileyo lokusebenza, ivalvu yokhuseleko iyavala ngokuzenzekelayo, iyeke ukukhupha ulwelo kwaye ihlale itywina. Ngamafutshane, ivalvu yokhuseleko kukuthintela uxinzelelo lwenkqubo ukuba lungadluli kwixabiso elithile, kwaye isetyenziselwa kakhulu ukukhusela inkqubo. Ivalvu yokunciphisa uxinzelelo kukunciphisa uxinzelelo lwenkqubo ukusuka kuxinzelelo oluphezulu ukuya kwixabiso elifunekayo, kwaye uxinzelelo lwayo lokuphuma lungaphakathi koluhlu, lo gama nje lungaphakathi koluhlu.
3. Ivalvu yokhuseleko kunye nevalvu yokunciphisa uxinzelelo ziintlobo ezimbini zeevalvu, eziziivalu ezikhethekileyo. Phakathi kwazo, ivalvu yokhuseleko yeyesixhobo sokukhulula ukhuseleko, esiyivalvu ekhethekileyo, esebenza kuphela xa uxinzelelo olusebenzayo ludlula uluhlu oluvumelekileyo, kwaye idlala indima yokukhusela kwinkqubo. Ivalvu yokunciphisa uxinzelelo yivalvu yenkqubo enokuthomalalisa izinto ezixinzelelweyo ukuze ihlangabezane neemfuno zoxinzelelo lwenkqubo emva kokucubungula. Inkqubo yayo yokusebenza iyaqhubeka.