Metal wrap pad ndi chinthu chosindikizira chomwe chimagwiritsidwa ntchito kwambiri, chopangidwa ndi zitsulo zosiyanasiyana (monga chitsulo chosapanga dzimbiri, mkuwa, aluminiyamu) kapena bala la pepala la alloy. Lili ndi elasticity yabwino komanso kukana kutentha kwapamwamba, kukana kupanikizika, kukana kwa dzimbiri ndi makhalidwe ena, choncho imakhala ndi ntchito zambiri m'makampani a valve.

Chitsulo chomangira zitsulo mochenjera chimagwiritsa ntchito kukana kutentha, kulimba ndi mphamvu zachitsulo komanso kufewa kwa zinthu zopanda zitsulo, kotero kuti kusindikiza kumakhala bwinoko, komanso ntchito ya tepi yachitsulo chosapanga dzimbiri yokhotakhota yosinthika ya graphite pad ndiyo yabwino kwambiri. Chiyerekezo cha precompression ndi chocheperako kuposa cha asbestos chomangira pad, ndipo palibe chilema cha asbestos fiber capillary leakage. M'malo opangira mafuta, 0Cr13 imagwiritsidwa ntchito pazingwe zachitsulo, pomwe 1Cr18Ni9Ti imalimbikitsidwa pazofalitsa zina.

Chitsulo chosapanga dzimbiri ndi chosinthika graphite chokhotakhota PAD mu sing'anga mpweya, ntchito kuthamanga kwa 14.7MPa, mu madzi angagwiritsidwe ntchito mpaka 30MPa. Kutentha -190 ~ + 600 ℃ (palibe mpweya, kuthamanga otsika angagwiritsidwe ntchito 1000 ℃).

Pad yokhotakhota ndiyoyenera kusinthanitsa kutentha, ma reactors, mapaipi, mavavu, ndi polowera polowera ndi ma flanges otulutsa okhala ndi mphamvu yayikulu komanso kusinthasintha kwa kutentha. Kwa zipsinjo zapakati kapena zapamwamba komanso kutentha kopitilira 300 ° C, kugwiritsa ntchito mphete zamkati, zakunja kapena zamkati ziyenera kuganiziridwa. Ngati concave ndi convex flange ntchito, bala PAD ndi mphete mkati bwino.

Kusindikiza kwabwino kumatha kupezekanso pomamatira mbale za graphite zosinthika mbali zonse za graphite yosinthira pad. Chowotchera chazinyalala cha chomera chachikulu cha feteleza wamankhwala ndi chida chofunikira kwambiri cha kutentha kwambiri komanso kuthamanga kwambiri. Chingwe chopindika cha graphite chokhala ndi mphete yakunja chimagwiritsidwa ntchito, chomwe sichimatuluka pamene katundu wadzaza, koma amatuluka pamene katunduyo wachepetsedwa. Mbale yosinthika ya graphite ya 0.5mm wandiweyani imawonjezedwa mbali zonse za gasket ndikudulidwa mu mawonekedwe a arc. Mbali yolumikizira imapangidwa ndi diagonal lap joint, yomwe imagwiritsidwa ntchito bwino.