Isitulo sevalve kwipetroli yokutsha yangaphakathi okanye i-injini ye-diesel ngumgangatho apho ivalve yokungena okanye yokukhupha iphumla ngexesha lomjikelo wokusebenza kwe-injini xa kuvalwa ivelufa.Isihlalo sevalve siyinxalenye ebalulekileyo ye-injini kuba ukuba ibekwe ngendlela engafanelekanga, ilungelelaniswe kakuhle, okanye ibunjwe ngexesha lokwenziwa, ukuvuza kwevalvu kuya kwenzeka okuya kuchaphazela kakubi umlinganiselo woxinzelelo lwe-injini kwaye ke ngoko ukusebenza kwe-injini, ukusebenza (amandla kunye netorque), ukukhutshwa kwe-exhaust, kunye nobomi be-injini.
Izihlalo zevalvu zihlala zisenziwa ngokucofa kuqala-ukufaka iqhekeza elimalunga necylindrical yealloyi yentsimbi eqinisiweyo, efana neStellite, ibe kukudandatheka okuphoswe kwintloko yesilinda ngentla kwesiqu ngasinye se-valve yesikhondo, kwaye emva koko kwenziwa mashini umphezulu wecandelo leconical kwivalve. isihlalo esiya kuhlangana neconical-candelo elihambelanayo levalve ehambelana nayo.Ngokubanzi imiphezulu emibini ene-conical-section, enye ine-engile yekhowuni ebanzi kwaye enye ine-engile yekhowuni encinci, yenziwe ngomatshini ngaphezulu nangaphantsi kwendawo yokukhwelana, ukwenza umphezulu wokukhwelana ukuya kububanzi obufanelekileyo (okuthiwa "ucutha" isihlalo), kunye nokwenza ukuba ibekwe ngokufanelekileyo ngokubhekiselele kumphezulu (obanzi) wokukhwelana wevalve, ukuze kubonelelwe ukutywinwa okulungileyo kunye nokudluliselwa kobushushu, xa isivalo sivaliwe, kunye nokubonelela ngeempawu ezilungileyo zokuhamba kwegesi ngevalve, xa ivuliwe.
Ii-injini ezingabizi kakhulu zinokuba nezihlalo zevalvu ezisikwe ngokulula kwimathiriyeli yentloko yesilinda okanye ibhloko yenjini (kuxhomekeke kuyilo lwenjini).Ezinye ii-injini ezitsha zinezihlalo ezifafazwe kuzo kunokuba zicinezelwe entloko, zivumela ukuba zibe ncinci, zidale ukuhanjiswa kobushushu ngokufanelekileyo kwizitulo zevalvu, kwaye zenza ukuba iziqu zevalve zisebenze kubushushu obusezantsi, oko kuvumela ivalve. iziqu (kunye nezinye iindawo zevalvetrain) zibe zincinci kwaye zibe khaphukhaphu.
Kukho iindlela ezininzi apho isitulo sevalve sinokubekwa ngendlela engafanelekanga okanye senziwe ngoomatshini.Oku kubandakanya izihlalo ezingaphelelanga ngexesha loshicilelo lokufaka inyathelo, ukugqwethwa kweendawo zokuhlala ezibizwa ngokuba zisetyhula ukuze ziphambuke ngendlela engamkelekiyo ukusuka kumjikelo ogqibeleleyo okanye ukugungqa, ukuthambeka kwemigangatho engoomatshini xa kuthelekiswa nomngxuma wesikhokelo sevalve, ukutenxa komphezulu wesihlalo sevalve ukusuka ekugxileni. kunye nemingxunya yesikhokelo sevalve, kunye nokutenxa kwecandelo le-conical esenziwe ngomatshini lesihlalo sevalvu ukusuka kwi-engile yekhowuni efunekayo ukuze itshatise umphezulu wevalvu.Ulawulo oluzenzekelayo lomgangatho wezihlalo zevalvu ezifakelweyo nezinoomatshini ngokwesithethe bekunzima kakhulu ukufikelela kuzo de kwafika i-digital holography eyenze ukuba i-high-definition metrology ithathele umlinganiselo zonke ezi zinxaxhi zidwelisiweyo.
| Igama leMathiriyeli | Iipropati eziphambili | Amanqaku | Uluhlu lobushushu |
|---|---|---|---|
| IVIRGIN PTFE | I-coefficient ephantsi kakhulu ye-friction kunye nokuchasana kakuhle kweekhemikhali. | I-FDA ivunyiwe | -40°C ukuya kuma-260°C |
| I-15% ye-Glass ezaliswe yi-PTFE | Ukunciphisa amandla oxinzelelo kunye nokuguqulwa okuphantsi phantsi komthwalo kune-PTFE enyulu. | Izinto ezirhabaxa | -40°C ukuya kuma-260°C |
| I-25% ye-Glass ezaliswe yi-PTFE | Ngokufana ne-15% yeglasi yokumelana nokunxiba ngcono, amandla aphezulu oxinzelelo kunye ne-deformation ephantsi phantsi komthwalo. | Izinto ezirhabaxa | -40°C ukuya kuma-260°C |
| Isinyithi esingenasici esizaliswe yi-PTFE | Ukunxiba nzima kakhulu.Amandla agqwesileyo kunye nokuzinza phantsi kwemithwalo enzima kunye namaqondo okushisa aphakamileyo. | Ingasetyenziselwa ukusetyenziswa kwe-steam kunye ne-thermal fluid | -40°C ukuya kuma-260°C |
| TFM | Ubume obuxinene kakhulu bepolymer kune-PTFE yeNtombi.Ibonisa ngcono ukubuyiswa koxinzelelo. | I-TFE Polymer elungisiweyo | -40°C ukuya kuma-260°C |
| ICarbon Graphite igcwalise iTFM | Iqondo elisezantsi lokwandiswa kwe-thermal kune-TFM eqhelekileyo. | Ilungele ukusetyenziswa kwi-steam kunye ne-thermal fluid applications | -40°C ukuya ku-260°C nakwi-320°C kwi-Thermal Fluid applications. |
| UHMWPE | Ukumelana kakhulu neekhemikhali ezidliwayo, ngaphandle kwe-acids oxidising kunye nezinyibilikisi eziphilayo. | Ikwabizwa ngokuba yiModulus Polyethylene ePhakamileyo (HMPE) okanye iPolyethylene ePhezulu yokuSebenza (HPPE) | -40°C ukuya +80°C |
| PCTFE | Okugqwesileyo kukusetyenziswa kwe-cryogenic kunye ne-Oxygen. | I-homo-polymer yeChlorotrifluoroethylene | -270°C ukuya kuma-260°C |
| I-PEEK enyulu ye-450G | Ukumelana neekhemikhali ezigqwesileyo kunye neempawu zomatshini kumaqondo obushushu aphakamileyo. | I-organic polymer thermoplastic | -40°C ukuya kuma-260°C |
| I-PEEK ezaliswe yiKhabhoni | Iipropati ezininzi ezifanayo kwi-Virgin PEEK.Ngokukodwa kufanelekile kubushushu obuphakamileyo kunye neemeko zomthwalo ophezulu. | I-coefficient ephantsi yokhuhlane kwaye ifanelekile kwizicelo ezininzi eziyingozi kakhulu | -40°C ukuya kuma-260°C |
| I-PEEK HT | Igcina zonke iimpawu eziphambili kunye neenzuzo ze-PEEK 450G kodwa igcina iimpawu ezibonakalayo kwiqondo lokushisa eliphezulu. | Inokubonelelwa ngazo zombini ezinyulu ezingazaliswanga okanye njengezinto ezigcweleyo ezidityanisiweyo | ukuya kuthi ga kuma-260°C |
| I-Acetal kunye neDelrin | Ibonisa ukuchasana kakuhle kokugqoka kunye nokuguqulwa phantsi komthwalo. | Igqwesileyo kwizicelo zesitulo sevalvu | ukuya kuthi ga kuma-80°C |
| VESPEL | Isixhobo se-polyimide esinamandla obushushu obuphezulu phantsi komthwalo kwaye sisetyenziselwa ikakhulu ukuhanjiswa kobushushu, iigesi ezishushu kunye namafutha. | Makungasetyenziswa ne-STEAM |
Ixesha lokuposa: Jan-24-2019