Lapho kuhlolwa amasistimu amapayipi amasha, amapayipi namavalvu ahlolwa kuqala: ukuhlolwa kokuvuza okubili, ukuhlolwa okukodwa kwe-hydrostatic okungu-150% kanye nokuhlolwa kokuvuza kwe-N2He (nitrogen, helium) okukodwa.Lezi zivivinyo azihlanganisi nje kuphela ama-flange axhuma i-valve namapayipi, kodwa futhi nebhonethi ne-valve yokuxhumana yomzimba, kanye nazo zonke izingxenye zepulaki/spool emzimbeni wamavalvu.

Ukuqinisekisa ukuthi i-cavity ngaphakathi kwesango elihambisanayo noma i-valve yebhola icindezeleke ngokwanele ngesikhathi sokuhlolwa, i-valve kufanele ibe sesimweni esivulekile esingu-50%, njengoba kuboniswe kuMfanekiso 1. Kuze kube manje yonke into ibonakala isebenza kahle, kodwa ingabe kungenzeka ngempela ukwenza lokhu kumavalvu esango lembulunga evame ukusetshenziswa kakhulu?Uma womabili amavalvu esendaweni evuleke uhhafu njengoba kukhonjisiwe kuMfanekiso 2, ukucindezela okungaphakathi kuzosebenza ekupakishweni kwe-valve shaft.Ukupakishwa kozipho kuvamise ukuba yi-graphite material.Ku-150% wengcindezi yokuklama, lapho kuhlolwa ngamagesi amancane amangqamuzana afana ne-helium, ngokuvamile kudingekile ukuqinisa ama-bolts ekhava ye-valve yokucindezela ukuze uthole imiphumela yokuhlola evamile.

Inkinga ngalokhu kusebenza, noma kunjalo, ukuthi ingakwazi ukucindezela ukupakisha, okuholela ekucindezelekeni okwandayo okudingekayo ukuze kusetshenziswe i-valve.Njengoba ukungqubuzana kukhula, kanjalo nezinga lokuguga kokusebenza ekupakisheni.

Uma indawo ye-valve ingekho esihlalweni esingaphezulu sophawu, kukhona ukuthambekela kokuphoqa i-valve shaft ukuthi inyakaze lapho iqinisa ibhonethi yokucindezela.Ukutsheka kwe-valve shaft kungase kubangele ukuthi iklwebhe ikhava yevalvu ngesikhathi sokusebenza futhi kubangele izimpawu zokuklwebheka.

Uma ukungaphathwa kahle ngesikhathi sokuhlolwa kokuqala kubangela ukuvuza okuvela ku-shaft packing, kuwumkhuba ojwayelekile ukuqhubeka nokuqinisa ibhonethi yokucindezela.Ukwenza kanjalo kungase kubangele ukulimala okukhulu kwekhava yevalvu yokucindezela kanye/noma amabholithi endlala.Umfanekiso wesi-4 uyisibonelo sesimo lapho i-torque eyeqile isetshenziswa ku-nati/ibhawodi ye-gland, okubangela ukuthi ikhava yevalvu yokucindezela igobe futhi igxumeke.Ukucindezeleka okwedlulele kubhonethi yokucindezela nakho kungabangela ukuba amabhawudi ebhonethi anqamuke.

Inathi lesembozo se-valve yokucindezela libe selithukululwa ukuze kudambise ingcindezi ekupakishweni kwe-valve shaft.Ukuhlolwa kokuqala kulesi simo kungasho ukuthi kunenkinga ngesiqu kanye/noma uphawu lwebhonethi.Uma ukusebenza kwesihlalo sophawu olungaphezulu kukubi, cabanga ukushintsha i-valve.Sengiphetha, isihlalo sophawu olungenhla kufanele sibe uphawu olufakazelwe lwensimbi-kuya-metal.

Ngemuva kokuhlolwa kokuqala, kuyadingeka ukufaka ukucindezeleka kokucindezela okufanele ekupakini kwe-stem ngenkathi uqinisekisa ukuthi ukupakisha akucindezeli isiqu.Ngale ndlela, ukugqoka ngokweqile kwe-valve stem kungagwenywa, futhi impilo evamile yesevisi yokupakisha ingagcinwa.Kunamaphuzu amabili okufanele aqashelwe: Okokuqala, ukupakishwa kwe-graphite okucindezelwe ngeke kubuyele esimweni ngaphambi kokucindezelwa ngisho noma ukucindezela kwangaphandle kukhululiwe, ngakho ukuvuza kuzokwenzeka ngemva kokukhipha ukucindezeleka okucindezelayo.Okwesibili, lapho uqinisa ukupakishwa kwe-stem, qiniseka ukuthi indawo ye-valve isendaweni yesihlalo esiphezulu sokuvala.Uma kungenjalo, ukucindezelwa kokupakishwa kwe-graphite kungase kungalingani, kubangele isiqu se-valve sibe nokuthambekela kokutsheka, okubangela ukuthi i-valve iklwejwe, futhi ukupakishwa kwe-valve stem kuvuze kakhulu, futhi i-valve enjalo kufanele. kushintshwe.