Gland packing yog ib lub foob siv dav siv rau kev sib khi hauv ntau daim ntawv thov. Lub hauv paus ntsiab lus ntawm kev khiav hauj lwm ntawm lub gasket yog yooj yim: nrog kev pab los ntawm nws, nruj nreem tau tiav ntawm cov pob qij txha ntawm qhov chaw. Cov roj foob siv tsis tau tsuas yog nyob rau hauv mobile units ntawm mechanisms, tab sis kuj ua hauj lwm zoo kawg li thaum sealing zoo li qub adhesions (piv txwv li, nyob rau hauv pipelines).
Nws muaj dab tsi
Gland packing yog woven los ntawm threads nyob rau hauv daim ntawv ntawm ib tug hlua ntawm lub duab plaub los yog square seem. Nyob ntawm cov kev siv (siab, dynamic loads, kub tej yam kev mob), lub gasket yog ua los ntawm TRG graphite threads, txhim kho nrog reinforcing bases los ntawm ntau yam ntaub ntawv los yog los ntawm polytetrafluoroethylene (PTFE) ropes.
siv qhov twg
Gland packing yog siv, raws li tau hais los saum no, rau kev sib khi:
- tsau thiab txav tau cov kav dej txuas txuas;
- autoclaves;
- pumps;
- compressors;
- rebar;
- mixers thiab lwm yam units.
Kuj hauv kev lag luam:
- gas ntau lawm;
- roj tsim;
- processing;
- food;
- atomic.
chaw ua haujlwm:
- roj;
- superheated steam;
- dej;
- gases (nrog rau cov roj liquefied);
- tshuaj phem;
- khoom siv roj av.
Ntse
Gland gasket muaj cov yam ntxwv hauv qab no:
- tshuaj tiv thaiv (inertness) rau ntau yam kev txhoj puab heev;
- qhov taw qhia me me ntawm kev sib txhuam (qhov pom ntawm qhov txo qis ntawm kev txav ntawm cov khoom sib txuas);
- hluav taws xob tiv thaiv;
- zog;
- sealed;
- kub resistant;
- kev nyab xeeb;
- tsis muaj kev laus (tsis qhuav tawm thaum tu thiab ua haujlwm);
- elasticity (ntev lub neej ntawm cov khoom siv).
Yuav ua li cas cov khoom yuav tsum ntim cov thawv muaj
Txoj cai tswjfwm tsim tshwj xeeb rau cov hlua. Cov tseem ceeb tshaj plaws muaj nyob ntawm no.
- Lub gasket yuav tsum tsis muaj tshuaj lom neeg. Yam tsawg kawg nkaus, cov khoom siv raw yuav tsum tsis txhob hnov qab txog kev sib cuag nrog cov nruab nrab sib cais lossis hloov nws cov txiaj ntsig zoo. Piv txwv li, yog tias lub thawv ntim khoom siv los kaw lub installation (kem, scrubber) uas cov pa phem lossis alkalis thiab acids ua, ces lub thawv ntim khoom yuav tsum yog cov kua qaub thiab alkali resistant. Tib yam siv rau hydrocarbons (roj av, roj, roj). Kev tawgroj foob tuaj yeem ua rau muaj kev ntxhov siab, kev sib tsoo, poob ntawm reagents thiab lwm yam.
- Lub pob valve yuav tsum tiv taus qhov kub thiab txias. Hauv particular, distillation ntawm cov roj hauv cov kab distillation yog nqa tawm ntawm qhov kub thiab txias. Depressurization tuaj yeem ua rau muaj qhov tsis zoo ntawm cov khoom siv distillation, ignition, tso vapors mus rau sab nraud, thiab txawm tias tawg.
- Yog cov roj foob siv rau hauv cov lus qhia sib xyaw, lawv yuav tsum tiv taus cov khoom sib txawv. Piv txwv li, txhawm rau kaw qhov txav ntawm cov twj tso kua mis, lub thawv ntim khoom yuav tsum tiv taus kev sib txhuam. Tsis tas li ntawd, cov gaskets yuav tsum tiv taus kev puas tsuaj. Ua li no, lawv tau ntxiv nrog ntau yam tshuaj, piv txwv li, fluoroplast.
Tsis txhob ua txhaum txoj cai
Txhua qhov kev tsim khoom muaj nws tus kheej cov qauv rau kev siv thiab nruab cov thawv ntim khoom zoo li cas. Tag nrho cov ntsiab lus ntawm qhov yuav tsum tau muaj xws li qhov tseem ceeb xws li kev nyab xeeb. Kev ua tsis tau raws li cov kev cai ntawm kev teeb tsa (qhov xwm txheej, qib ntawm kev nruj ntawm kev sib txuas, tus naj npawb ntawm cov nplhaib gasket) thiab kev ua haujlwm tuaj yeem ua rau muaj qhov tshwm sim loj tshaj plaws. Thiab yog li tag nrho cov ntsiab lus yuav tsum tau txiav txim siab:
- txoj cai ntawm daim ntawv thov;
- khoom xaiv;
- Gland packing hloov sij hawm;
- txhim kho kev sib txuas lus thiab cov khoom siv kaw.
Nyob caj pas packings
Vim lub gasket yog, qhov tseeb, ib txoj hlua ua los ntawm cov khoom sib txawv, cesnws qhov sib txawv yuav tsuas yog muaj nyob rau hauv seem, muaj pes tsawg leeg thiab cov qauv ntawm weaving. Cov khoom ntim nto moo tshaj plaws yog:
- graphite;
- asbestos;
- PTFE;
- synthetic fiber ncoo;
- asbestos-free.
YGraphite packings
Ua los ntawm cov ntawv siv zog. Qhov zoo ntawm cov gaskets yog tias lawv muaj cov yam ntxwv ntawm cov thermal conductivity tsawg thiab coefficient ntawm kev sib txhuam. Qhov tsis zoo - lawv tsis raug tso cai siv rau hauv ib puag ncig uas muaj cov ntsiab lus siab ntawm nitrogen, chloride thiab chromium compounds.
Asbestos ntau yam
Cov khoom ntim no yog siv rau hauv qhov chaw nruj heev, vim nws tiv tau zoo nrog qhov kub thiab txias. Nws cov cim: AS, AP, AIR, AGP. Cov gaskets no yog siv rau hauv cov roj, metallurgical thiab roj industries, nrog rau hauv kev lag luam tsheb.
PTFE
Elastic thiab tiv taus cov mob hnyav. Qhov tshwj xeeb ntawm cov ntim khoom no yog txwv tsis pub siv rau hauv ib puag ncig uas muaj chlorine. Lawv siv rau hauv kev lag luam tshuaj, roj thiab tshuaj lom neeg.
Packings ua los ntawm cov xov hluavtaws
Cov gaskets no tiv taus abrasives. Lawv siv nyob rau hauv cov ntaub so ntswg thiab ntawv, tshuaj thiab roj industries.
Asbestos-free
Muaj peev xwm muaj ntau hom: qee qhov ntawm lawv tau ntxiv dag zog nrog tooj dag hlau, thiab qee qhov yog impregnated nrog roj ntxiv. Nyob ntawm qhov kev siv, ib hom tshwj xeeb raug xaiv.
Raws li qauvCov tub ntxhais gasket yog qhov txawv los ntawm, ib txheej thiab ntau txheej weaving. Pump stuffing boxing tuaj yeem yog 3 txog 50 hli, nyob ntawm nws lub hom phiaj.
