Ukucindezela okuzisholo (i-PN), izinga lephawundi elijwayelekile le-Class American ( Lb ), kuyindlela yokuveza ingcindezi, umehluko wukuthi ingcindezi abayimele ihambisana nezinga lokushisa elihlukile lereferensi, uhlelo lwe-PN European lubhekisela ekucindezelweni okungu-120 ° C. ingcindezi ehambisanayo, kuyilapho i-CLAss American Standard ibhekisela ekucindezelweni okuhambisanayo ku-425.5 ° C. Ngakho-ke, ekushintsheni kobunjiniyela, akunakwenzeka ukumane wenze ukuguqulwa kwengcindezi.Isibonelo, i-CLAss300 kufanele ibe ngu-2.1MPa ngokuguqulwa kwengcindezi elula.Kodwa-ke, uma izinga lokushisa lokusebenza licatshangelwa, ingcindezi ehambisanayo izokhula.Ngokusho kokuhlolwa kwezinga lokushisa nokucindezela kokumelana kwezinto Isilinganiso silingana no-5.0MPa.
Kunezinhlobo ezimbili zezinhlelo zama-valve: enye iwuhlelo “lokucindezela okuzisholo” olumelwe iJalimane (kuhlanganise ne-China) olusekelwe ekucindezelweni okuvumelekile okusebenzayo endaweni yokushisa yasekamelweni (amadigri ayi-100 ezweni lami namadigri ayi-120 eJalimane).Esinye “isimiso sezinga lokushisa nokucindezela” esimelelwa yi-United States, emelwe ingcindezi yokusebenza evumelekile ezingeni elithile lokushisa.Kuhlelo lokushisa nokucindezela kwe-United States, ngaphandle kwe-150Lb, esekelwe kuma-degree angu-260, amanye amazinga asekelwe ku-454 degrees..Ukucindezeleka okuvumelekile kwesigaba se-150-psi (150psi=1MPa) No. 25 carbon steel valve yi-1MPa ku-260 degrees, futhi ukucindezeleka okuvunyelwe ekamelweni lokushisa kukhulu kakhulu kuno-1MPa, mayelana ne-2.0MPa.Ngakho-ke, uma sikhuluma nje, izinga lokucindezela okulinganiselwe elihambisana ne-American Standard 150Lb lingu-2.0MPa, kanti izinga lokucindezela okulinganiselwe elihambisana no-300Lb lingu-5.0MPa, njll. ifomula yokuguqula ingcindezi .
I-PN iyikhodi ehlobene nengcindezi emelwa izinombolo, futhi iyinani eliphelele eliyindilinga ukuze lisetshenziswe.I-PN iyinombolo ye-MPa emelana nokucindezela cishe elingana nezinga lokushisa elivamile, okuyingcindezi yamagama evame ukusetshenziswaAma-valve aseShayina.Ukuze ama-valve okulawula ngecarbon steel valveimizimba, isho ingcindezi yokusebenza ephezulu evumelekile uma isetshenziswa ngaphansi kuka-200°C;emizimbeni yamavalvu ensimbi, isho ingcindezi ephezulu evumelekile yokusebenza uma isetshenziswa ngaphansi kuka-120°C;Ubukhulu bengcindezi yokusebenza evumelekile yezinhlelo zokusebenza ngaphansi kuka-250°C.Lapho izinga lokushisa lokusebenza likhuphuka, ukumelana nokucindezela komzimba we-valve kuzokwehla.I-valve ejwayelekile yaseMelika iveza ukucindezela okuzisholo ngamakhilogremu, okuwumphumela wokubala wokushisa okuhlanganisiwe nokucindezela kwensimbi ethile, ebalwa ngokwezinga le-ANSI B16.34.Isizathu esiyinhloko sokuthi kungani isigaba sephawundi kanye nokucindezela okubizwa ngokuthi akukona ukuxhumana okukodwa ukuthi isisekelo sokushisa sekilasi lephawundi kanye nokucindezela okuzisholo kuhlukile.Ngokuvamile sisebenzisa isofthiwe ukuze sibale, kodwa futhi sidinga ukwazi indlela yokusebenzisa amathebula ukuhlola izikali.I-Japan ikakhulukazi isebenzisa inani lika-K ukuze ibonise izinga lokucindezela.Ngomfutho wegesi, e-China, ngokuvamile sisebenzisa iyunithi yayo yesisindo "kg" ukuchaza (kunokuthi "jin"), futhi iyunithi ingu-kg.Iyunithi yokucindezela ehambisanayo ithi “kg/cm2″, futhi ikhilogremu eyodwa yokucindezela isho ukuthi ikhilogremu yamandla isebenza kusentimitha eyodwa yesikwele.Ngokufanayo, ngokuhambisana namazwe angaphandle, ngenxa yokucindezela kwegesi, iyunithi yokucindezela evame ukusetshenziswa yi-"psi", futhi iyunithi "i-pounds engu-1/inch2", okusho "amaphawundi nge-intshi yesikwele".Igama lesiNgisi eliphelele amaphawundi ngeyintshi yesikwele.Kodwa isetshenziswa kakhulu ukubiza ngokuqondile iyunithi yayo enkulu, okungukuthi, iphawundi (Lb.), okuyi-Lb empeleni.Lokho kungamandla ephawundi okukhulunywe ngawo ekuqaleni.Ingabalwa ngokushintsha wonke amayunithi abe amayunithi e-metric: 1 psi=1 pound/inch2 ≈0.068bar, 1 bar≈14.5psi≈0.1MPa, amazwe afana ne-Europe ne-United States asetshenziselwa ukusebenzisa i-psi njengeyunithi.Ku-Class600 naku-Class1500, kunamanani amabili ahlukene ahambisana nezinga lase-Europe kanye ne-American standard.I-11MPa (ehambisana nesigaba samaphawundi angu-600) iwumthethonqubo wesistimu wase-Europe, ocaciswe ku-“ISO 7005-1-1992 Steel Flanges”;I-10MPa (ehambisana nekilasi lamaphawundi angu-600) iyisimiso sohlelo lwaseMelika, okungumthethonqubo ku-ASME B16.5.Ngakho-ke, angeke kushiwo ngokuphelele ukuthi isigaba se-600-pound sihambisana ne-11MPa noma i-10MPa, futhi imithethonqubo yezinhlelo ezahlukene ihlukile.
Ngokuyinhloko kunezinhlobo ezimbili zezinhlelo zama-valve: enye iwuhlelo “lokucindezela okuzisholo” olumelwe iJalimane (kuhlanganise nezwe lami) ngokusekelwe ekucindezelweni okuvumelekile okusebenzayo ekamelweni lokushisa (amadigri ayi-100 ezweni lami namadigri angu-120 eJalimane).Enye isistimu “yezinga lokushisa nokucindezela” emelwe yi-United States, emelwe ingcindezi yokusebenza evumelekile ezingeni elithile lokushisa.Kuhlelo lokushisa nokucindezela kwe-United States, ngaphandle kwe-150Lb, esekelwe kuma-degree angu-260, amanye amazinga asekelwe ku-454 degrees.ibhentshimakhi.Isibonelo, ingcindezi evumelekile ye-150Lb.I-25 carbon steel valve ingu-1MPa kumadigri angu-260, futhi ukucindezeleka okuvunyelwe ekamelweni lokushisa kukhulu kakhulu kuno-1MPa, okungaba ngu-2.0MPa.Ngakho-ke, uma sikhuluma nje, izinga lokucindezela okulinganiselwe elihambisana ne-American Standard 150Lb lingu-2.0MPa, kanti izinga lokucindezela okulinganiselwe elihambisana no-300Lb lingu-5.0MPa, njll. ifomula yokuguqula ingcindezi .
Njengoba izisekelo zokushisa zokucindezela okujwayelekile kanye nesilinganiso sokucindezela zihlukile, akukho ukuxhumana okuqinile phakathi kwakho kokubili.Ukuxhumana phakathi kwalokhu okubili kukhonjisiwe ethebulani.
Isikhathi sokuthumela: Aug-31-2023