Lub sealing nto ntawm lub valve feem ntau corroded, eroded thiab hnav los ntawm nruab nrab, yog li nws yog ib feem uas yooj yim puas ntawm lub valve. Xws li pneumatic pob valve thiab hluav taws xob npauj npaim valve thiab lwm yam tsis siv neeg li qub, vim qhov qhib thiab kaw nrawm nrawm, lawv qhov zoo thiab kev pabcuam lub neej cuam tshuam ncaj qha. Lub hauv paus yuav tsum tau ntawm lub valve sealing nto yog tias lub valve tuaj yeem ua kom muaj kev ruaj ntseg thiab txhim khu kev qha sealing raws li kev ua haujlwm tau teev tseg. Yog li, cov khoom ntawm qhov chaw yuav tsum muaj cov yam ntxwv hauv qab no:
(1) Kev ua haujlwm zoo sealing, uas yog, lub sealing nto yuav tsum muaj peev xwm tiv thaiv kom tsis txhob muaj qhov nruab nrab;
(2) Muaj qee lub zog, lub sealing nto yuav tsum muaj peev xwm tiv taus tus nqi tshwj xeeb ntawm kev sib khi tsim los ntawm qhov nruab nrab siab sib txawv;
(3) Corrosion kuj, nyob rau hauv lub sij hawm ntev kev pab cuam ntawm corrosive nruab nrab thiab kev ntxhov siab, lub sealing nto yuav tsum muaj zog corrosion kuj uas yog sib xws nrog cov qauv tsim;
(4) Lub peev xwm los tiv thaiv khawb, lub valve sealing yog tag nrho cov ntsaws ruaj ruaj, thiab muaj kev sib txhuam ntawm kev sib khi thaum lub sijhawm qhib thiab kaw;
(5) Erosion tsis kam, lub sealing nto yuav tsum muaj peev xwm tiv thaiv kev yaig ntawm kev kub ceev xov xwm thiab kev sib tsoo ntawm cov khoom sib tsoo;
(6) Zoo thermal stability, lub sealing nto yuav tsum muaj lub zog txaus thiab oxidation tsis kam ntawm qhov kub thiab txias, thiab yuav tsum muaj qhov txias txias ntawm qhov kub thiab txias;
(7) Kev ua haujlwm zoo, yooj yim rau kev tsim thiab tswj, lub valve yog siv los ua cov khoom siv dav dav, thiab nws tau lees tias muaj txiaj ntsig kev lag luam.
Kev siv cov xwm txheej thiab xaiv cov hauv paus ntsiab lus ntawm valve sealing nto cov ntaub ntawv. Lub sealing nto cov ntaub ntawv muab faib ua ob pawg: hlau thiab tsis-hlau. Cov xwm txheej ntawm cov khoom siv feem ntau yog raws li hauv qab no:
(1) Roj hmab. Nws feem ntau yog siv rau qhov kev sib khi ntawm qhov tsis tshua muaj siab mos-sealed rooj vag li qub, diaphragm li qub, npauj npaim li qub, kos li qub thiab lwm yam li qub.
(2) Yas. Cov yas siv rau lub sealing nto yog nylon thiab PTFE, uas muaj cov yam ntxwv zoo corrosion kuj thiab me me coefficient.
(3) Peb. Kuj hu ua bearing alloy, nws muaj kev tiv thaiv corrosion zoo thiab muaj peev xwm khiav tau zoo. Nws yog tsim rau lub sealing nto ntawm lub kaw-off valve rau ammonia uas tsis tshua muaj siab thiab kub ntawm -70-150 ℃.
(4) Copper alloy. Nws muaj qhov hnav tsis zoo thiab qee qhov kub tsis kam. Nws yog tsim rau lub ntiaj teb valve, cam khwb cia hlau rooj vag valve thiab kos valve, thiab lwm yam. Nws yog feem ntau siv rau cov dej thiab chav dej uas tsis tshua muaj siab thiab kub tsis siab tshaj 200 ℃.
(5) Chrome-nickel stainless hlau. Nws muaj zoo corrosion kuj, yaig kuj thiab kub kuj. Haum rau kev tshaj tawm xws li vapor nitric acid.
(6) Chrome stainless hlau. Nws muaj qhov zoo corrosion kuj thiab feem ntau yog siv rau hauv li qub nrog kev kub siab thiab kub tsis siab tshaj 450 ℃ rau roj, dej vapor thiab lwm yam xov xwm.
(7) High chromium surfacing hlau. Nws muaj kev ua haujlwm zoo corrosion thiab ua haujlwm hardening, thiab yog tsim rau kev kub siab, kub kub roj, chav thiab lwm yam xov xwm.
(8) Nitrided hlau. Nws muaj zoo corrosion kuj thiab khawb kuj, thiab feem ntau yog siv nyob rau hauv thermal fais fab chaw nres tsheb qhov rooj li qub. Cov khoom no tseem tuaj yeem raug xaiv rau qhov chaw ntawm lub pob valve nyuaj.
(9) Carbide. Nws muaj cov khoom zoo xws li corrosion kuj, yaig kuj thiab khawb tsis kam, thiab muaj lub neej ua haujlwm ntev. Nws yog cov khoom siv sealing zoo tagnrho. Feem ntau siv tungsten laum alloy thiab laum lub hauv paus alloy surfacing electrodes, thiab lwm yam, tuaj yeem ua ultra-siab siab, ultra-siab kub sealing nto, haum rau roj, roj, roj, hydrogen thiab lwm yam xov xwm.
(10) Txau welding alloy. Muaj cov cobalt-based alloys, npib tsib xee-raws li alloys, thiab puab tsaig-raws li alloys, uas muaj corrosion kuj zoo thiab hnav tsis kam.
Txhawm rau kom ntseeg tau tias muaj kev nyab xeeb thiab kev ntseeg siab ntawm lub valve foob, cov khoom xaiv yuav tsum tau txiav txim siab raws li cov kev ua haujlwm tshwj xeeb. Yog hais tias qhov nruab nrab yog corrosive heev, thaum xaiv cov ntaub ntawv, nws yuav tsum ua tau raws li corrosive kev ua tau zoo thaum xub thawj, thiab tom qab ntawd ua tau raws li qhov yuav tsum tau ua ntawm lwm yam khoom; Lub foob ntawm lub rooj vag valve yuav tsum tau them sai sai rau qhov zoo khawb tsis kam; Kev nyab xeeb li qub, throttle li qub thiab regulating valve yog feem ntau yooj yim eroded los ntawm nruab nrab, thiab cov ntaub ntawv uas zoo corrosion kuj yuav tsum tau xaiv; Rau cov qauv inlaid ntawm lub nplhaib sealing thiab lub cev, cov ntaub ntawv uas muaj siab hardness yuav tsum raug suav hais tias yog lub sealing nto; General li qub uas tsis tshua muaj kub thiab siab yuav tsum xaiv cov roj hmab thiab yas nrog zoo sealing zoo li sealing; Thaum xaiv cov khoom sib khi, nws yuav tsum tau muab sau tseg tias qhov hardness ntawm qhov chaw ntawm lub rooj zaum valve yuav tsum siab tshaj qhov sealing nto ntawm lub valve disc.
Post lub sij hawm: Nov-02-2022