Uluhlu lokucoca ulwelo lujonga ivalve yesandla. Ngexesha lolondolozo, ivelufa yokukhangela kufuneka ivalwe ukuze kumiswe i-oyile ephuma etankini. Icebo lokucoca ulwelo kufuneka libe phantsi kwenqanaba leoyile xa ufaka. Ukuba itsheki ayivulanga ngokupheleleyo, nceda ungaqali ukusebenza kwempompo, hleze oko kubangele ingozi.
Isalathi sokucoca ulwelo kucofa umqondiso xa uxinzelelo luwela ngaphaya kwento lifikelela kwi-0.018MPa ebonisa ukuba isihluzi kufuneka sicocwe.