Lub kauv qhov txhab gasket sib txuas cov elasticity ntawm cov hlau nrog cov yas ntawm cov khoom muab tub lim. Nws yog tsim los ntawm alternately winding V-zoo li tus hlau strips thiab mos muab tub lim tapes (graphite los yog PTFE) rau hauv ib tug composite qauv. Nws cov sealing kev ua tau zoo yog ua tiav los ntawm peb theem.
1. Initial Sealing - Cov Filler Mos Conforms rau Flange Surfaces
Thaum flange bolts tau nruj, cov ntaub ntawv thov compresses lub gasket. Cov khoom siv muab tub lim (graphite lossis PTFE) deforms plastically nyob rau hauv siab thiab ntws mus rau hauv qhov zoo machining grooves, khawb, thiab lub zos corrosion pits ntawm lub flange sealing lub ntsej muag, thaiv txoj kev xau ntawm qhov chaw. Tib lub sijhawm, V- cov hlau zoo li lub strips yog compressed nrog lawv qhib lub kaum sab xis, tab sis cov hlau nws tus kheej tsis crushed - nws tseem nyob rau hauv ib tug compressed lub xeev nrog elastic zog khaws cia. Lub hauv paus ntsiab lus tseem ceeb ntawm no yog: cov khoom muag muag ua tau raws li lub ntsej muag flange imperfections, es tsis yog cia siab rau ntawm flange nto ua zoo kawg nkaus.
2. Thermal Compensation – Hlau Elasticity teb rau Expansion thiab Contraction
Qhov no yog qhov zoo tshaj plaws ntawm kauv lub qhov txhab gaskets tsis yog -hlau gaskets (xws li compressed asbestos lossis khoom PTFE). Thaum cov khoom siv ua haujlwm, qhov kub thiab txias hloov pauv, kev hloov pauv siab, thiab ntev - lub sij hawm bolt kev ntxhov siab tuaj yeem ua rau muaj kev sib cais me me ntawm lub ntsej muag flange.
Tsis yog-cov gaskets yog xim hlau, ib zaug compressed, tsis muaj kev rov qab txaus- tej flange sib cais tam sim ntawd ua rau to. Piv txwv li, V- zoo li tus hlau strips nyob rau hauv ib tug kauv lub qhov txhab gasket ua raws li ua tau - nyob rau hauv springs. Lub zog elastic khaws cia thaum compression raug tso tawm raws li qhov xav tau, tsis tu ncua thawb lub ntsej muag muag tiv thaiv lub ntsej muag kom muaj kev sib khi kev ntxhov siab, zoo them nyiaj rau qhov khoob los ntawm thermal distortion thiab bolt so. Cov ntaub ntawv ntsuam xyuas kev lag luam feem ntau qhia txog kev rov qab los ntawm 15% -20% rau cov kab mob kis kab mob, uas yog qhov tseem ceeb rau lawv qhov kev cia siab ntev ntev -.
3. Extended Leak Path – High Flow Resistance
Lub gasket tsis yog ib qho khoom thaiv. Rau txhua qhov nruab nrab mus rau sab nraud, nws yuav tsum hla ntau txheej txheej hlau thiab cov ntaub ntawv muab tub lim. Qhov kev tsim kho multilayer no tsim ib txoj hauv kev ntev thiab tortuous uas muaj kev tiv thaiv tseem ceeb. Qhov nruab nrab lub siab poob zuj zus raws txoj kev no; Thaum nws tsis txaus los kov yeej qhov kev tawm tsam tawm, cov dej ntws tawm tau zoo. Ntxiv mus, txawm tias hlau thiab muab tub lim muaj sib txawv coefficients ntawm thermal expansion, lub multilayer qauv haum rau cov kev sib txawv txav los ntawm localized micro-deformations, tiv thaiv tag nrho cov foob tsis ua hauj lwm vim kub hloov.
Cov lus pom zoo rau installation:
Tswj tus nqi compression li ntawm 30% -40%. Tshaj - compression yuav rhuav tshem cov elastic cia ntawm cov hlau strips, ua rau lub gasket poob nws lub peev xwm rov qab los thiab ua tsis tiav ntxov.
Rau siab -kub, siab - siab zog los yog corrosive media, gasket nrog lub nplhaib sab hauv yog pom zoo. Lub nplhaib puab tiv thaiv radial misalignment thaum lub sij hawm kev teeb tsa thiab tiv thaiv cov khaubncaws sab nraud povtseg ntawm mos muab tub lim kom tsis txhob tawg.
