Ukupakisha kwe-PTFE indlala kuyisixazululo esisebenza kahle nesithembekile sokuvala esisetshenziswa ezinhlotsheni ezibanzi zezimboni. Ihlinzeka ngokusebenza okuhle kakhulu kokuvala nokuqina, okwenza kube ukukhetha kokuqala kokuvala ama-shafts neziqu ze-valve. Kulesi sihloko, sizohlola ukuthi ukupakisha kwe-PTFE kwendlala kusebenza kanjani nokuthi kungani kubhekwa njengenye yezinketho ezingcono kakhulu zokuvala ezitholakalayo.
Ukupakisha indlala kuyinto yokuvala esetshenziselwa ukuvimbela ukuvuza kwamaphampu, ama-valve nezinye izinto ezijikelezayo. Ngokuvamile zenziwe ngezinto ezilukiwe noma ezisontekile njenge-graphite, i-Teflon, noma imicu ye-aramid. Lezi zinto zakhethwa ngenxa yekhono lazo lokumelana nezinga lokushisa eliphezulu, ukucindezela kanye nezindawo zamakhemikhali ezinonya.
I-PTFE, noma i-polytetrafluoroethylene, iyi-fluoropolymer yokwenziwa eyaziwa kabanzi ngokumelana kwayo namakhemikhali okuhle kakhulu kanye nezindawo eziphansi zokungqubuzana. Yaziwa kakhulu ngeTeflon futhi inguphawu lokuthengisa olubhalisiwe lwenkampani yamakhemikhali iChemours. I-PTFE imelana namakhemikhali amaningi, ama-asidi nezincibilikisi, okuyenza ilungele izinhlelo zokusebenza zokupakisha indlala lapho impahla yokuvala idinga ukumelana nemidiya enolaka.
Umgomo wokusebenza we-PTFE gland packing ulula kodwa uyasebenza kakhulu. Izinto zokupakisha zibekwe eduze kwe-shaft noma isiqu futhi zicindezelwe yindlala. Indlala iwuphawu lomshini othi uma luqinisiwe ludale uphawu oluvikelekile, olungavuzi. Ukucindezelwa kwezinto zokupakisha kudala umgoqo phakathi kwe-shaft noma induku kanye nendlu, okuvimbela noma yikuphi uketshezi noma igesi ukuthi ingaphumi.
Enye yezinzuzo eziyinhloko zokupakisha kwe-PTFE yikhono layo lokuhambisana nokuma kwe-shaft noma i-valve stem, ukuqinisekisa ukuvala okuqinile ngisho nangaphansi kwezimo zokusebenza ezihlukene. Lokhu kuvumelana nezimo kuvumela ukupakisha ukuthi kunxephezele nganoma iyiphi i-shaft noma ukungahambi kahle kwesiqu noma ukunyakaza, ukuvimbela ukuvuza nokunciphisa izidingo zokulungisa.
I-coefficient ephansi ye-PTFE yokungqubuzana iqinisekisa ukusebenza kahle futhi inciphisa ukuguga ku-shaft noma isiqu. Lokhu akugcini nje ngokunciphisa ithuba lokuvuza, futhi kwandisa impilo yeyunithi. Ukwengeza, ukupakisha kwezindlala ze-PTFE kune-coefficient ephansi yokwanda okushisayo, okuyenza imelane nokuguquguquka kwezinga lokushisa nokushaqeka kokushisa.
Amaphakethe endlala enziwe nge-PTFE ayaziwa nangezakhiwo zawo ezihle kakhulu zokuzigcoba. Igcina ifilimu yokugcoba elincanyana ku-shaft noma isiqu, inciphisa nakakhulu ukungqubuzana futhi ivimbele ukuguga ngokweqile. Lesi sici sokuzithambisa senza i-PTFE indlala ukupakisha ifaneleke ngezikhathi ezithile ukomisa noma izinhlelo zokusebenza zokugcoba ezinganele.
Ukwengeza, ukupakisha kwendlala ye-PTFE kungamelana namazinga okushisa asukela ezimeni ze-cryogenic kuya kumazinga okushisa aphezulu kakhulu. Ihlala izinzile futhi igcina izakhiwo zayo zokuvala ngisho namazinga okushisa aphakeme, okwenza kube ukukhetha okuthembekile kwezicelo ezifunayo.
Kafushane, ukupakisha kwe-PTFE indlala kuyisixazululo esisebenzayo nesiguquguqukayo sokubeka uphawu sezinhlelo eziningi ezihlukene zezimboni. Ukumelana kwayo namakhemikhali okuvelele, izici eziphansi zokungqubuzana nokusebenza okuhle kakhulu kokuvala kuyenza ibe yisinqumo sokuqala sokuvala ama-shafts neziqu ze-valve. Kungakhathaliseki ukuthi kusendaweni enezinga lokushisa eliphezulu, ezimbonini zokucubungula amakhemikhali, noma ezinye izinhlelo zokusebenza ezinzima, ukupakishwa kwe-PTFE kwendlala kunikeza isigxivizo esivikelekile, esingavuzi esigcina okokusebenza kusebenza kahle kuyilapho kunciphisa izidingo zokunakekela.
Isikhathi sokuthumela: Sep-08-2023