0102030405
Ukunakwa ekukhethweni okufanele kwama-valve ezinhlelweni zamapayipi okwakha - Umhlahlandlela wokukhethwa kwezibeka ezibalulekile endaweni yokulawula.
2022-10-13
Ukunakwa ekukhethweni okuyikho kwama-valve kumasistimu amapayipi okwakha - Umhlahlandlela wokukhethwa kwezigxivizo ezibalulekile endaweni yokulawula Ekwakheni amapayipi, amavalvu adlala indima yokulawula uketshezi. Ngenxa yesakhiwo esihlukile kanye nezinto ezibonakalayo, ngakho-ke ama-valve akhiqizwa awafani. Ukuze kuqinisekiswe ukuthi uhlelo lwamapayipi lungafinyelela ukusebenza kahle okuphezulu, izindleko eziphansi kanye nempilo ende yesevisi, ukukhethwa okulungile kwama-valve kubaluleke kakhulu. I-valve inemisebenzi emine eyinhloko: qala futhi umise ukuhamba kwemidiya; Lungisa ukugeleza okuphakathi; Ivimbela ukugeleza emuva noma i-reflux futhi ilawule noma ikhulule umfutho woketshezi. Ukukhethwa kwesistimu yamapayipi wokwakha kungacatshangwa ngokusho kwezinga lokushisa, uhlobo oluphakathi, izinga lokushisa nezinye izici. , isibonelo, ku-valve yokulawula i-valve yomlilo yesakhiwo esiphezulu kufanele isetshenziswe isignali, lokhu kuhlobene nokuthi uhlelo lwe-fire hydrant luyisihluthulelo sokusetshenziswa okunengqondo, lapho ama-valve okulawula uhlelo lwe-fire hydrant asethelwa ku-valve yesignali, futhi i-valve evulekile ukuze iboniswe phakathi nendawo yokulawula umlilo, ukuze kube lula ukuhlolwa kokuphatha, nakuba izindleko zikhuphukile, nokho, Isilinganiso sokutshalwa kwezimali ohlelweni lwe-hydrant jikelele sisencane kakhulu, futhi singenza ukuphepha okuphelele uhlelo lwe-hydrant, olufanele ukutshalwa kwezimali. Uhlobo lwe-valve ESETSHENZISWA ohlelweni lwamapayipi okwakha kufanele lukhethwe ngokuya nezici zesakhiwo. Uma i-valve esetshenzisiwe ingafaneleki ezicini zokuklama zesakhiwo, izingozi eziningi ezingenzeka zizovela njalo. Ukukhethwa kwesimo se-valve kuzothinta ngqo ukusebenza kanye nekhwalithi ye-valve elawulayo kanye nohlelo lokulawula. Ngakho-ke indlela yokukhetha i-valve positioner ngendlela efanele nangendlela enengqondo ibaluleke kakhulu endaweni yokulawula. Amagama angukhiye: igayidi yokukhetha i-valve positioner ezinhlelweni eziningi zokulawula, indawo yokubeka i-valve ingenye yezesekeli ezibaluleke kakhulu. Ngohlelo oluthile, uma ufuna ukukhetha indawo efanele (noma enhle) yamavalvu, kufanele ucabangele lezi zici ezilandelayo: 1) Ingabe indawo yokubeka amavalvu ingaba "ukuhlukana phakathi"? Ingabe kulula futhi kulula ukusebenzisa "ukuhlukanisa"? Ukuba nomsebenzi "wokwehlukana" kusho ukuthi isibonisi sevalvu siphendula kuphela kuhlu lwamasiginali okokufaka (isb, 4 kuya ku-12mA noma 0.02 kuya ku-0.06MPaG). Ngakho-ke, uma ungakwazi "ukuhlukanisa", ungakwazi ngokuvumelana nezidingo zangempela, isignali eyodwa kuphela yokufaka ukuze uzuze ukulawulwa kwama-valve okulawula amabili noma ngaphezulu. 2) Ingabe ukulungiswa kwephuzu elinguziro nobubanzi kulula futhi kulula? Kungenzeka yini ukulungisa uziro nobubanzi ngaphandle kokuvula isivalo? Kodwa-ke, kubalulekile ukuqaphela ukuthi ngezinye izikhathi ukulungisa okunjalo okungenangqondo kudinga ukuvinjelwa ukuze kugwenywe ukusebenza okungalungile (noma okungekho emthethweni). 3) Kuyini ukuzinza kukaziro nobubanzi? Uma AYIZIRO NOBANGA KUTSHENZISWA EKUSHINTSHENI EZINGAPHEZULU, UKUDIKIZELA, ISIKHATHI, NOMA IMICINDEZELO YOKUFAKA, ISIQINISEKISO ESIFANELE SIBUYISELWE KANJALO UKUZE UQINISEKISE UKUHAMBA OKUNEMBILE KWESILAWULI. 4) Sinembe kangakanani i-valve positioner? Ngokufanelekile, kusignali yokokufaka, Izingxenye zokunquma zevalvu (Izingxenye zokuNquma, okuhlanganisa i-spool, isiqu, isihlalo se-valve, njll.) isikhathi ngasinye kufanele zimiswe ngokunembile endaweni edingekayo, kungakhathaliseki ukuthi ikuphi lapho uhamba khona noma i-valve elawulayo ngendlela. umthwalo omningi wezingxenye zangaphakathi. 5) Iyini imfuneko yekhwalithi yomoya ye-valve positioner? Njengoba inombolo encane kakhulu yamayunithi okuphakelwa komoya angahlinzekwa ukuze kuhlangatshezwane namazinga e-ISA (izindinganiso zekhwalithi yomoya zokushaywa kwezinsimbi: ISA STANDARD F7.3) ZOMOYA, NGAKHO-KE, NGEZIKHUNGO ZOMOYA-MOBILIZED NOMA ELECTRIC-GAS (VALVE), UMA ZIKHONA. KUFANELE UKUMELANA NEZIMALI ZOMHLABA WANGEMPELA, KUMELE BAKWAZI UKUMELANA NEYALI ELITHILE LOKUTHULI, UMSAKA KANYE KAFUTHA. 6) Ingabe ukulinganiswa kukaziro nobubanzi kuyathintana noma kuzimele? Uma zithintana, oziro nobubanzi kuthatha isikhathi esengeziwe ukulungisa, ngoba ishuna kufanele ilungise ngokuphindaphindiwe la mapharamitha amabili ukuze kancane kancane ifinyelele isilungiselelo esiqondile. 7) Ingabe i-valve positioner ifakwe "I-Bypass" evumela ukuthi isignali yokufaka isebenze ngokuqondile kusilawuli? Lokhu "bypass" ngezinye izikhathi kungenza kube lula noma kweqe ukulinganiswa Kwezilungiselelo Ze-Actuator, njengokuthi: "I-Benchset setting" kanye "Nesethingi Yomthwalo Wesihlalo" se-actuator -- lokhu kungenxa yokuthi ezimweni eziningi, isignali yokuphuma kwe-aerodynamic yezinye izilawuli zomoya. ifanelana "nesethi yesihlalo" se-actuator ukuze kungabikho ukusetha okwengeziwe okudingekayo (eqinisweni, kulokhu, izindawo zokubeka iValve zingasuswa ngokuphelele. Yiqiniso, uma kukhethiwe, khona-ke isihleli se-valve singasetshenziswa futhi "ukudlula" isignali yokukhipha umoya we-pneumatic regulator ngqo kumlawuli). OKUNYE, nge-"bypass" ngezinye izikhathi futhi kungavumela ukulungiswa okulinganiselwe noma ukugcinwa kwe-valve positioner ku-inthanethi (okungukuthi, ukusetshenziswa kwe-valve positioner "bypass" ukuze umlawuli aqhubeke nokugcina umsebenzi ojwayelekile, ngaphandle kokuphoqa isilawuli singaxhunyiwe ku-inthanethi. ). 8) Ukuthi umsebenzi we-valve positioner uyashesha yini? Ukugeleza komoya Ukugeleza komoya okukhulu (indawo yesivaliva ihlale iqhathanisa isignali yokufaka kanye nezinga levalvu futhi ilungisa okukhiphayo ngokomehluko. Uma isibonisi sevalvu siphendula ngokushesha kulokhu kuchezuka, ukugeleza komoya okwengeziwe ngesikhathi seyunithi ngayinye), ukulungisa ngokushesha isistimu IPHENDULELA Kuphoyinti nokulayisha ukuhluka -- okusho iphutha elincane lesistimu (ukusalela) kanye nekhwalithi yokulawula engcono. 9) Izici zeFrequency ye-valve positioner (noma i-frequency Response, Frequency Response -- G (jω), ithini impendulo yesimo sokuzinza yesistimu kokokufaka kwe-sinusoidal? Ngokuvamile, iba phezulu isici sokuvama (okungukuthi, ukuphakama kokuzwela ekuphenduleni kwefrikhwensi), ukusebenza kokulawula okungcono kakhulu kufanele kuqashelwe ukuthi izici zefrikhwensi kufanele zinqunywe Izindlela Zokuhlola Ezivumelanayo kunezindlela zethiyori, futhi indawo yokubeka i-valve ne-actuator kufanele kucatshangelwe ndawonye lapho kuhlolwa i-valve. izici zefrikhwensi 10) Ingakanani ingcindezi yokuphakelwa komoya ephezulu elinganiselwe yesibonisi sevalvu? Isibonelo, ezinye izindawo zokubeka amavalvu zinengcindezi enkulu elinganiselwe yokuhlinzeka komoya okungu-501b/in kuphela (okungukuthi 50psi, lpsi =0.07kgf/cm ≈ 6.865kpa), isihleli sevalvu siba yisithiyo ekukhipheni okuphumayo kwe-actuator uma i-actuator ikalwa ukuthi isebenze. ngengcindezi ephakeme kuno-501b/in. 11) Uma i-valve elawulayo kanye nesibeka se-valve sihlanganiswa futhi sihlanganiswa, kuthiwani nge-Positioning Resolution yazo? Lokhu kunomphumela osobala kakhulu kwikhwalithi yokulawula yesistimu yokulawula, ngoba ukuphakama kwesinqumo, ukusondelana nokuma kwe-valve elawulayo kuba nenani elifanele, futhi izinguquko zokuguquguquka okubangelwa Ukudubula Okuphezulu kwe-valve elawulayo kungalawulwa, ukuze kukhawulwe izinguquko zezikhathi zenani elilawulwayo. 12) Ukuthi ukuguqulwa okuhle nokubi kwesimo sevalvu kungenzeka? Ingabe inguquko ilula? Kwesinye isikhathi lesi sici siyadingeka. ISIBONELO, UKUSHINTSHA Imodi ethi "SIGNAL INCREASE-VALVE CLOSE" IYA IMODI "EVULIWE OKUPHATHELENE KOKUKHULISA IVALI", UNGASEBENZISA umsebenzi Wokuguqulela Ophozithivu FUTHI OKUBI. 13) Kuyinkimbinkimbi kangakanani ukusebenza kwangaphakathi nokugcinwa kwe-valve positioner? Njengoba sonke sazi, izingxenye eziningi, isakhiwo sokusebenza sangaphakathi siyinkimbinkimbi, ukuqeqeshwa okwengeziwe kokulungiswa (ukulungisa), kanye nezingxenye ezisele esitokweni. 14) Kuyini Ukusetshenziswa Komoya Okuqinile kwesimo sevalvu? Kokunye ukufakwa kwezitshalo, le parameter ibalulekile futhi ingaba isici esikhawulelayo. 15) Yebo, ezinye izici kufanele zicatshangelwe lapho kuhlolwa futhi kukhethwa izindawo zokubeka ama-valve. Isibonelo, Ukuxhunyaniswa Kwempendulo ye-valve positioner kufanele kubonise indawo ye-spool; Ngaphezu kwalokho, indawo yokubeka i-valve kufanele ibe namandla futhi iqine, ibe nokuvikelwa kwemvelo nokumelana nokugqwala, futhi kube lula ukuyifaka nokuxhuma.