Qhov chaw kaw ntawm lub valve feem ntau raug xeb, xeb thiab hnav los ntawm cov khoom nruab nrab, yog li nws yog ib feem uas yooj yim puas tsuaj rau lub valve. Xws li lub pob valve pneumatic thiab lub valve npauj npaim hluav taws xob thiab lwm yam valve tsis siv neeg, vim yog qhib thiab kaw ntau zaus thiab ceev ceev, lawv qhov zoo thiab lub neej kev pabcuam raug cuam tshuam ncaj qha. Qhov yuav tsum tau ua ntawm qhov chaw kaw lub valve yog tias lub valve tuaj yeem ua kom muaj kev nyab xeeb thiab txhim khu kev qha sealing raws li cov xwm txheej ua haujlwm tshwj xeeb. Yog li ntawd, cov khoom siv ntawm qhov chaw yuav tsum muaj cov yam ntxwv hauv qab no:
(1) Kev ua haujlwm zoo ntawm kev sib khi, uas yog, qhov chaw sib khi yuav tsum tiv thaiv tau qhov xau ntawm qhov nruab nrab;
(2) Muaj qee lub zog, qhov chaw sib khi yuav tsum muaj peev xwm tiv taus qhov siab tshwj xeeb ntawm qhov sib khi uas tsim los ntawm qhov sib txawv ntawm qhov nruab nrab;
(3) Kev tiv thaiv corrosion, nyob rau hauv kev pabcuam ntev ntawm cov khoom siv corrosive thiab kev ntxhov siab, qhov chaw sealing yuav tsum muaj kev tiv thaiv corrosion muaj zog uas sib xws nrog cov qauv tsim;
(4) Lub peev xwm tiv taus khawb, lub valve sealing yog txhua yam dynamic seals, thiab muaj kev sib txhuam ntawm kev sib khi thaum lub sijhawm qhib thiab kaw;
(5) Kev tiv thaiv kev yaig, qhov chaw sib khi yuav tsum muaj peev xwm tiv taus kev yaig ntawm cov xov xwm ceev ceev thiab kev sib tsoo ntawm cov khoom khov kho;
(6) Kev ruaj khov thermal zoo, qhov chaw sealing yuav tsum muaj lub zog txaus thiab tiv taus oxidation ntawm qhov kub siab, thiab yuav tsum muaj kev tiv taus txias zoo ntawm qhov kub qis;
(7) Kev ua haujlwm zoo, yooj yim rau kev tsim khoom thiab tswj, lub valve yog siv ua cov khoom siv dav dav, thiab nws tau lees tias muaj txiaj ntsig zoo.
Cov xwm txheej siv thiab cov ntsiab cai xaiv ntawm cov khoom siv nto sealing valve. Cov ntaub ntawv nto sealing raug muab faib ua ob pawg: hlau thiab tsis yog hlau. Cov xwm txheej siv tau ntawm cov ntaub ntawv siv feem ntau yog raws li nram no:
(1) Roj Hmab. Feem ntau siv rau qhov xwm txheej sealing ntawm cov qhov rooj kaw uas tsis muaj zog, cov qhov rooj diaphragm, cov qhov rooj npauj npaim, cov qhov rooj kuaj xyuas thiab lwm yam.
(2) Yas. Cov yas siv rau qhov chaw sealing yog nylon thiab PTFE, uas muaj cov yam ntxwv ntawm kev tiv thaiv corrosion zoo thiab coefficient me me ntawm kev sib txhuam.
(3) Babbitt. Kuj hu ua bearing alloy, nws muaj kev tiv thaiv corrosion zoo thiab muaj peev xwm khiav tau zoo. Nws yog qhov tsim nyog rau qhov chaw kaw ntawm lub valve kaw rau ammonia nrog qhov siab qis thiab kub ntawm -70-150 ℃.
(4) Tooj liab hlau. Nws muaj kev tiv taus zoo thiab qee qhov kub tsis kam. Nws yog qhov tsim nyog rau lub qhov dej valve, lub qhov rooj hlau cam khwb cia thiab lub qhov dej valve, thiab lwm yam. Nws feem ntau yog siv rau dej thiab pa dej nrog qhov siab qis thiab qhov kub tsis siab tshaj 200 ℃.
(5) Cov hlau tsis xeb chrome-nickel. Nws muaj kev tiv thaiv corrosion zoo, tiv thaiv kev yaig thiab tiv thaiv kub. Haum rau cov xov xwm xws li pa nitric acid.
(6) Chrome stainless hlau. Nws muaj kev tiv thaiv corrosion zoo thiab feem ntau yog siv rau hauv cov li qub nrog siab siab thiab kub tsis siab tshaj 450 ℃ rau roj, dej pa thiab lwm yam xov xwm.
(7) Cov hlau uas muaj chromium ntau. Nws muaj kev tiv thaiv corrosion zoo thiab ua haujlwm tau zoo, thiab tsim nyog rau kev kub siab, roj kub siab, pa thiab lwm yam xov xwm.
(8) Hlau Nitrided. Nws muaj kev tiv thaiv corrosion zoo thiab khawb tsis kam, thiab feem ntau yog siv rau hauv lub qhov rooj ntawm lub zog hluav taws xob thermal. Cov khoom siv no kuj tuaj yeem xaiv rau lub voj voog ntawm lub pob valve uas kaw ruaj khov.
(9) Carbide. Nws muaj cov khoom zoo xws li kev tiv thaiv corrosion, kev tiv thaiv kev yaig thiab kev tiv thaiv khawb, thiab muaj lub neej ua haujlwm ntev. Nws yog cov khoom siv sealing zoo tagnrho. Feem ntau siv tungsten drill alloy thiab drill base alloy surfacing electrodes, thiab lwm yam, tuaj yeem ua rau qhov chaw sealing siab heev, kub heev, tsim rau roj, roj, roj av, hydrogen thiab lwm yam xov xwm.
(10) Cov hlau txhuam vuam. Muaj cov hlau cobalt, cov hlau nickel, thiab cov hlau chin, uas muaj kev tiv thaiv corrosion zoo thiab kev hnav tsis kam.
Yuav kom ntseeg tau tias lub foob pob valve muaj kev nyab xeeb thiab ntseeg tau, cov khoom siv xaiv yuav tsum tau txiav txim siab raws li cov xwm txheej ua haujlwm tshwj xeeb. Yog tias cov khoom nruab nrab muaj xeb heev, thaum xaiv cov khoom siv, nws yuav tsum ua tau raws li kev ua haujlwm xeb thaum xub thawj, thiab tom qab ntawd ua tau raws li cov kev cai ntawm lwm yam khoom; Lub foob ntawm lub qhov rooj valve yuav tsum tau them sai sai rau qhov tsis kam khawb zoo; Cov khoom siv kev nyab xeeb, cov khoom siv throttle thiab cov khoom siv tswj hwm yooj yim raug xeb los ntawm cov khoom nruab nrab, thiab cov khoom siv uas muaj kev tiv thaiv xeb zoo yuav tsum tau xaiv; Rau cov qauv inlaid ntawm lub nplhaib sealing thiab lub cev, cov khoom siv uas muaj qhov nyuaj siab yuav tsum tau txiav txim siab ua qhov chaw sealing; Cov khoom siv dav dav uas muaj qhov kub thiab txias qis thiab siab yuav tsum xaiv roj hmab thiab yas uas muaj kev ua haujlwm sealing zoo ua qhov sealing; Thaum xaiv cov khoom siv sealing, nws yuav tsum tau sau tseg tias qhov nyuaj ntawm qhov chaw ntawm lub rooj zaum valve yuav tsum siab dua li qhov chaw sealing ntawm lub disc valve.
Lub sijhawm tshaj tawm: Kaum Ib Hlis-02-2022