Izihlungi zochungechunge lwe-XNJ zingafakwa phezulu kwethangi futhi i-element igxilile emafutheni, ngakho-ke kulula ukuyifaka. Ngesikhathi sesondlo, udinga kuphela ukucisha izikulufo zensimbi yokuxhuma, bese ukhipha i-flange yokuxhuma, into ingashintshwa noma ihlanzwe. Isikhombi se-vacuum kusihlungi sinikeza amasiginali lapho ukwehla kwengcindezi kufinyelela ku -0.018 MPa kukhombisa ukuthi into yokuhlunga kufanele ihlanzwe noma ishintshwe. Uma kungekho sondlo esenziwayo, njengoba ukwehla kwengcindezi kukhuphukela ku-0.02MPa, i-valve yokudlula kulesi sihlungi izovula ivumela ukugcwala kukawoyela kupompo ngqo, uma ukhetha lesi sihlungi sokuncela uchungechunge, inkomba yokudonsa kufanele idingeke entweni evinjwe ukungcola , ungayihlanza noma uyishintshe ngokushesha.