Yuav ua li cas xaiv cov khoom foob thaum ua ISO7-1 xov txuas ntawm stainless hlau xovxwm fittings?
Thaum xaiv cov khoom foob rau ISO7-1 (tseem hu ua BSPT - British Standard Pipe Taper) xov txuas ntawm stainless hlau xovxwm fittings, ntau yam yuav tsum tau txiav txim siab los xyuas kom meej kev sib raug zoo, kev nyab xeeb, thiab kav ntev. Kev xaiv yuav tsum suav nrog cov khoom siv, qhov chaw ua haujlwm, dej sib haum, siab, kub, thiab cov qauv siv tau.
Nov yog cov ncauj lus kom ntxaws txog kev txiav txim siab thiab cov ntaub ntawv uas siv rau kev sib khi xws li fittings:
1. Sealing Khoom Khoom
Tshuaj Compatibility: Cov khoom siv foob yuav tsum sib haum nrog cov kua dej los yog cov pa uas dhau los ntawm cov khoom siv hlau stainless. Cov ntaub ntawv tsis sib xws yuav degrade, o, los yog yaj.
Kub Resistance: Xav txog qhov ntau ntawm qhov kub thiab txias qhov fittings yuav raug, suav nrog txhua qhov ua tau spikes lossis qhov siab tshaj.
Siab Resistance: Cov khoom siv yuav tsum tiv taus lub siab hauv lub cev tsis muaj deforming lossis ua tsis tiav.
Durability: Cov khoom siv yuav tsum tiv taus hnav, kev laus, thiab qaug zog, tshwj xeeb tshaj yog tias raug rau kev thauj khoom dynamic lossis cyclic.
Elasticity: Txaus txaus los tsim ib lub foob zoo thaum lub fittings nruj, tsis tau ruaj txaus los tiv thaiv extrusion.
2. Common Seal Materials rau Stainless Hlau Xovxwm Fittings
| Khoom siv | Qhov kub thiab txias (degree) | Siab Resistance | Tshuaj Compatibility | Daim ntawv thov |
|---|---|---|---|---|
| PTFE (Teflon) | -200 rau +260 | Siab | Zoo heev rau feem ntau cov tshuaj | Kev kub siab, tshuaj lom neeg, kev siv cov kav dej dav dav |
| EPDM | -50 rau +150 | Nruab nrab | Zoo rau dej, chav dej, thiab cawv | HVAC systems, dej thiab chav siv, kev ua zaub mov |
| FKM (Viton) | -20 rau +200 | Siab | Zoo heev rau hydrocarbons, acids | Cov tshuab kub kub, roj tshuab, roj thiab roj |
| NBR (Nitrile) | -30 rau +100 | Nruab nrab | Zoo rau cov roj, roj, thiab roj | Roj thiab roj, tsheb, kev siv hluav taws xob tsawg |
| Silicone | -60 rau +230 | Tsawg rau Nruab Nrab | Zoo rau huab cua, dej, thiab qee yam tshuaj | Daim ntawv thov kev kho mob, zaub mov-qib, kev siv kub kub |
3. Cov lus pom zoo rau ISO7-1 Xov txuas hauv Stainless Hlau Xovxwm Fittings:
PTFE (Polytetrafluoroethylene):
Qhov zoo:Cov tshuaj tiv thaiv zoo heev; yuav luag inert rau feem ntau cov tshuaj.
Dav kub ntau, haum rau huab cua kub.
Non-reactive thiab non-contaminating, ua rau nws zoo tagnrho rau cov zaub mov-qib thiab kev siv kho mob.
Qhov tsis zoo:Tsis tshua muaj kev yooj yooj yim tuaj yeem ua rau nws nyuaj rau tsim kom nruj tsis muaj compression txaus.
Siv Cases: Pom zoo rau qhov kub thiab txias, siab zog, los yog tshuaj lom neeg ib puag ncig.
EPDM (Ethylene Propylene Diene Monomer):
Qhov zoo:Zoo tiv thaiv dej, chav, thiab ntau yam polars (cawv, ketones).
Zoo saj zawg zog thiab zoo heev sealing zog nyob rau hauv ib tug dav kub ntau yam.
Resistant rau ozone thiab UV hluav taws xob, haum rau kev siv sab nraum zoov.
Qhov tsis zoo:Tsis sib haum nrog hydrocarbons (roj, roj av).
Siv Cases: Zoo tagnrho rau HVAC systems, dej haus, thiab chav siv.
FKM (Fluoroelastomer lossis Viton):
Qhov zoo:Zoo heev tiv taus kub, tshuaj lom neeg, thiab roj.
Zoo yoog raws, tshwj xeeb tshaj yog thaum kub siab.
Qhov tsis zoo:kim dua lwm yam ntaub ntawv xws li EPDM lossis NBR.
Siv Cases: Zoo tagnrho rau qhov chaw kub thiab tshuaj lom neeg, nrog rau kev siv roj thiab roj.
NBR (Nitrile Butadiene Roj Hmab):
Qhov zoo:Kev tiv thaiv zoo rau cov roj, roj, thiab qee cov kua qaub.
Nqis thiab dav muaj.
Qhov tsis zoo:Tsawg qhov kub thiab txias piv rau lwm cov ntaub ntawv.
Tsis haum rau muaj zog acids lossis ozone-nplua nuj ib puag ncig.
Siv Cases: Haum rau kev lag luam roj thiab roj, tsheb, thiab kev siv hluav taws xob tsawg.
Silicone:
Qhov zoo:High yooj thiab kev ua tau zoo tshaj plaws ntawm ntau qhov kub thiab txias.
Non-toxic, haum rau zaub mov-qib thiab kev siv kho mob.
Qhov tsis zoo:Tsawg tsis kam rau siab piv rau lwm yam khoom siv.
Tsis zoo rau siv nrog cov khoom siv roj av.
Siv Cases: Zoo tagnrho rau kev kho mob, zaub mov-qib, thiab kev siv kub kub uas muaj tshuaj lom neeg tsawg.
4. Kev xaiv raws li daim ntawv thov thiab kev tshawb fawb
Thaum xaiv cov khoom foob, xa mus rau cov lus qhia thiab kev tshawb fawb los ntawm cov ntaub ntawv pov thawj xws li:
ISO Standards: ISO 8434-1 muab kev taw qhia txog kev sib txuas ntawm lub raj hlau thiab txoj kev sib khi.
ASTM Txuj: ASTM F1387 muab cov kev sim rau kev ua haujlwm ntawm fittings, suav nrog cov ntsaws ruaj ruaj.
Kev tshawb fawb thiab kev lag luam luam tawm: Tshawb nrhiav cov kev tshawb fawb lossis cov ntawv dawb los ntawm cov ntaub ntawv tshawb fawb cov ntaub ntawv lossis cov ntawv tshaj tawm kev lag luam ntsig txog cov yeeb nkab haum kev ua tau zoo, kev ua haujlwm ntev, thiab kev soj ntsuam tsis ua haujlwm.
5. Xaus: Foob Khoom Xaiv rau Stainless Hlau Xovxwm Fittings
Rau kev siv dej los yog chav dej: SivEPDMcov ntsaws ruaj ruaj.
Rau qhov kub thiab txias los yog tshuaj lom neeg kev siv: XaivPTFElos yogFKMcov ntsaws ruaj ruaj.
Rau kev siv roj thiab roj: SivFKMlos yogNBRseals, nyob ntawm qhov kub thiab txias.
Rau kev siv zaub mov-qib lossis kev kho mob: Xaiv rauPTFElos yogSiliconecov ntsaws ruaj ruaj.