Malinga ndi zinthu zotsekera pamwamba,mavavu a chipataZingagawidwe m'mitundu iwiri: chisindikizo cholimba ndi chisindikizo chofewa. Kodi pali kusiyana kotani pakati pa valavu yofewa ndi valavu yolimba:
Valavu yotsekera chitseko cholimba: Zipangizo zotsekera pamalo onse awiri otsekera ndi zitsulo, zomwe zimatchedwa "chitseko cholimba". Kukana kutentha kwambiri, kukana kukalamba, zinthu zabwino zamakanika monga: chitsulo + chitsulo; chitsulo + mkuwa; chitsulo
+ Graphite; chitsulo + chitsulo chosakaniza. Zipangizo zosindikizira zomwe zimagwiritsidwa ntchito kwambiri ndi izi: chitsulo chosapanga dzimbiri cha 13Cr, zipangizo zolimba zosakaniza, tungsten carbide yopopera, ndi zina zotero. Malo osindikizirawo ndi otsekedwa bwino.
Valavu yofewa yotsekera chitseko: chitseko chotsekeracho chimapangidwa ndi zinthu zachitsulo mbali imodzi ndi zinthu zotanuka zosagwiritsa ntchito chitsulo mbali inayo, zomwe zimatchedwa "chitseko chofewa". Kutsekera kwa mtundu uwu wa chitseko ndi kwabwino, koma sikulimbika kutentha kwambiri, ndikosavuta kuvala, ndipo kuli ndi zinthu zosagwira ntchito bwino. Monga: chitsulo + rabala; chitsulo + PTFE, ndi zina zotero. Zimatanthauza kuti mbali imodzi ya chitsekocho imapangidwa ndi zinthu zolimba pang'ono. Nthawi zambiri, mpando wofewa wotsekeracho umapangidwa ndi zinthu zopanda chitsulo zomwe zimakhala ndi mphamvu zina, kuuma komanso kukana kutentha. Uli ndi magwiridwe antchito abwino otsekera ndipo ukhoza kutayikiratu, koma umakhala ndi moyo wautali. Poyerekeza ndi kusasinthasintha bwino ndi kutentha, chitseko cholimba chimapangidwa ndi chitsulo, ndipo magwiridwe antchito otsekerawo ndi otsika, ngakhale opanga ena amati sangatayiketu. Cholinga cha kupangidwa kwa valavu yofewa yotsekera chipata: kuthetsa vuto la mpando wa valavu ndi pamwamba pa mbale ya valavu yomwe yazimiririka kapena kusokonekera, mbale ya valavu imatha kubweza yokha chivundikiro cholimba cha kupanikizika ndi kupanikizika kokhazikika ndi valavu yofewa yotsekera chipata, ndikuthetsa vuto la zinthu zofewa zotsekera kuwonongeka ndi kukangana. Vuto la pamwamba potsekera, chifukwa chotsekera chipewa cha valavu ya chipata chingasinthidwe, zomwe zimawonjezera kwambiri kugwiritsa ntchito valavu.
Mitundu yothandiza ya valavu yofewa yotsekera chitseko: m'mimba mwake (p50-p400mm, kupanikizika 2.5-4.0MPa, madzi osiyanasiyana otentha osakwana 200℃).
Chisindikizo chofewa sichingakwaniritse zofunikira pa njira zina zowononga, ndipo chisindikizo cholimba chingathe kuchithetsa!
Mitundu iwiri ya zisindikizo izi imatha kugwirirana. Ponena za kulimba, chisindikizo chofewa ndi chabwino, koma tsopano kulimba kwa chisindikizo cholimba kungakwaniritsenso zofunikira zomwe zikugwirizana! Ubwino wa chisindikizo chofewa ndi magwiridwe antchito abwino otsekera, koma vuto lake ndilakuti n'losavuta kukalamba, kuvula, komanso kukhala ndi moyo waufupi. Chisindikizo cholimba chimakhala ndi moyo wautali, koma kulimba kwake n'koipa kuposa chisindikizo chofewa.