Ivalvu yokwandisa yinxalenye ebalulekileyo yenkqubo yokukhenkcisa, edla ngokufakwa phakathi kwesilinda yokugcina ulwelo kunye ne-evaporator. Ivalvu yokwandisa yenza i-liquid refrigerant kubushushu obuphakathi kunye noxinzelelo oluphezulu lube ngumphunga omanzi kubushushu obuphantsi kunye noxinzelelo oluphantsi ngokugoba kwayo, kwaye emva koko i-refrigerant ifunxa ubushushu kwi-evaporator ukuze ifezekise isiphumo sokukhenkcisa. Ivalvu yokwandisa ilawula ukuhamba kwevalvu ngotshintsho olukhulu lobushushu ekupheleni kwe-evaporator ukuthintela ukusetyenziswa kakubi kwendawo ye-evaporator kunye nesiganeko sokungqubana kwesilinda.
Ngamafutshane, ivalvu yokwandisa yenziwe ngomzimba, iphakheji yokuva ubushushu kunye netyhubhu yokulinganisela
Imeko efanelekileyo yokusebenza kwevalvu yokwandisa kufuneka ibe kukutshintsha ukuvulwa ngexesha langempela kunye nokulawula isantya sokuhamba ngokutshintsha komthwalo we-evaporator. Kodwa eneneni, ngenxa ye-hysteresis yokudluliselwa kobushushu kwi-envelope yokuva ubushushu, impendulo yevalvu yokwandisa isoloko icotha kancinci. Ukuba sizoba umzobo wexesha lokuhamba kwevalvu yokwandisa, siya kufumanisa ukuba ayilogophe eligudileyo, kodwa ngumgca ogobileyo. Umgangatho wevalvu yokwandisa ubonakala kwi-amplitude yewave. Okukhona i-amplitude inkulu, kokukhona i-reaction yevalvu icotha kwaye kokukhona umgangatho usiba mbi.
