Isihlungi sochungechunge sine-valve yokuhlola yesandla. Ngesikhathi sesondlo, i-valve yesheke kufanele ivalwe ukuze kumiswe ukuphuma kukaphethiloli ethangini. Isihlungi kufanele sibe ngaphansi kwezinga lamafutha lapho sifaka. Uma isheke valve ingakavuleki ngokuphelele, sicela ungaqali ukusebenza kwepompo, hleze lokho kudale ingozi.
Isikhombi se-vacuum kusihlungi sizokhombisa lapho ukwehla kwengcindezi kufinyelela ku-0.018MPa kukhombisa ukuthi isihlungi kufanele sihlanzwe.