Cam khwb cia hlau thiab ductile hlau npauj npaim li qub yog dav siv rau kev tswj ntws hauv ntau qhov kev lag luam, tab sis lawv txawv ntawm cov khoom siv, kev ua haujlwm, thiab kev siv. Hauv qab no yog cov ncauj lus kom ntxaws sib piv los pab koj nkag siab qhov sib txawv thiab xaiv lub valve uas haum rau koj cov kev xav tau.
1. Cov khoom xyaw
1.1 Cam khwb cia hlau npauj npaim Valve:
- Grey cam khwb cia hlau, hlau alloy nrog cov ntsiab lus siab carbon (2-4%).
- Vim nws cov microstructure, carbon muaj nyob rau hauv daim ntawv ntawm flake graphite. Cov qauv no ua rau cov khoom tawg raws cov graphite flakes nyob rau hauv kev ntxhov siab, ua rau nws nkig thiab tsis yooj yim.
- Feem ntau siv rau hauv kev siv qis thiab tsis tseem ceeb.
1.2 Ductile Hlau Npauj Npaim Valve:
- Ua los ntawm cov hlau ductile (tseem hu ua nodular graphite cam khwb cia hlau los yog ductile hlau), nws muaj me me ntawm magnesium los yog cerium, uas faib cov graphite nyob rau hauv ib tug kheej kheej (nodular). Cov qauv no txhim kho cov khoom ductility thiab toughness.
- Muaj zog, yoog raws, thiab tsis tshua muaj kev puas tsuaj ntau dua li cov hlau cam khwb cia.
2. Mechanical Properties
2.1 Grey Cam khwb cia hlau:
- Lub zog: Tsawg tensile zog (feem ntau 20,000-40,000 psi).
- Ductility: nkig, ua rau qaug zog tawg thaum muaj kev ntxhov siab lossis cuam tshuam.
- Impact Resistance: Tsawg, nquag tawg nyob rau hauv lub nra hnyav lossis thermal shock.
- Corrosion Resistance: Nruab nrab, nyob ntawm ib puag ncig thiab txheej txheej.
2.2 Cov Hlau Hlau:
- Lub zog: Spherical graphite txo cov ntsiab lus kev ntxhov siab, ua rau muaj zog tensile ntau dua (feem ntau 60,000-120,000 psi).
- Ductility: Ntau dua ductile, tso cai rau deformation yam tsis muaj cracking.
- Impact Resistance: Zoo heev, muaj peev xwm tiv taus kev poob siab thiab kev co.
- Corrosion Resistance: Zoo ib yam li cam khwb cia hlau, tab sis tuaj yeem txhim kho nrog cov coatings lossis hauv ob sab phlu.
3. Kev ua tau zoo thiab kav ntev
3.1 Cam khwb cia hlau npauj npaim li qub:
- Haum rau cov ntawv thov uas tsis tshua muaj siab (piv txwv li, mus txog 150-200 psi, nyob ntawm tus qauv tsim).
- Siab melting point (txog 1150 ° C) thiab thermal conductivity zoo heev (tsim rau kev co damping daim ntaub ntawv, xws li braking systems).
- Tsis muaj zog tiv thaiv kev ntxhov siab, ua rau lawv tsis tsim nyog rau kev vibration siab lossis cyclic loading ib puag ncig.
- Feem ntau hnyav dua, uas tuaj yeem nce nqi installation.
3.2 Ductile Hlau Npauj Npaim Valves:
- Muaj peev xwm tswj tau siab dua (piv txwv li, mus txog 300 psi lossis siab dua, nyob ntawm tus qauv tsim).
- Vim nws lub zog ntau dua thiab yooj yim dua, cov hlau tsis tshua muaj feem cuam tshuam rau hauv kev khoov lossis cuam tshuam, es tsis txhob deforming plastically, ua raws li "toughness design" hauv paus ntsiab lus ntawm cov khoom siv niaj hnub no. Qhov no ua rau nws tsim nyog rau kev thov rau kev thov.
- Ntau ruaj nyob rau hauv ib puag ncig nrog qhov kub thiab txias hloov pauv lossis kev ntxhov siab txhua yam.
4. Daim ntawv thov Scenarios
4.1 Cam khwb cia hlau npauj npaim li qub:
- Feem ntau siv hauv HVAC systems.
- Siv hauv cov tshuab tsis tseem ceeb uas tus nqi yog qhov tseem ceeb. - Haum rau cov kua dej uas tsis tshua muaj siab xws li dej, huab cua, lossis cov roj uas tsis muaj corrosive (chloride ion <200 ppm).
4.2 Ductile Hlau Npauj Npaim Valves:
- Haum rau kev siv dej thiab kev kho dej khib nyiab nrog nruab nrab lossis tsis muaj zog acidic / alkaline media (pH 4-10).
- Haum rau kev siv hauv kev lag luam, suav nrog roj thiab roj, kev ua tshuaj lom neeg, thiab cov tshuab dej siab.
- Siv rau hauv cov tshuab uas xav tau kev ntseeg siab dua, xws li cov tshuab tiv thaiv hluav taws lossis cov kav dej uas muaj qhov hloov pauv hloov pauv.
- Haum rau ntau cov kua dej corrosive thaum siv nrog cov ntaub ntawv tsim nyog (xws li EPDM, PTFE).
5. Tus nqi
5.1 Cam khwb cia hlau:
Vim nws txoj kev tsim khoom yooj yim dua thiab cov khoom siv qis dua, nws feem ntau tsis tshua kim. Nws yog haum rau tej yaam num uas tsis tshua muaj peev xwm thiab tsawg xav tau kev pab. Thaum cam khwb cia hlau yog pheej yig, nws brittleness ua rau ntau zaus hloov thiab pov tseg.
5.2 Hlau Hlau:
Vim cov txheej txheem alloying thiab kev ua tau zoo dua, tus nqi ntau dua. Rau cov ntawv thov uas xav tau kev ua haujlwm ntev thiab lub zog, tus nqi siab dua yog tsim nyog. Cov hlau ductile yog ntau tus phooj ywg ib puag ncig vim nws cov khoom siv rov ua dua tshiab (> 95%).
6. Cov qauv thiab Specifications
- Ob lub li qub ua raws li cov qauv xws li API 609, AWWA C504, lossis ISO 5752, tab sis cov hlau nplaum feem ntau ua tau raws li kev lag luam siab dua rau kev ua haujlwm siab thiab kav ntev.
- Cov khoom siv hlau nplaum feem ntau siv rau hauv cov ntawv thov kom ua raws li cov qauv kev lag luam nruj.
7. Corrosion thiab tu
- Cov ntaub ntawv ob leeg muaj kev cuam tshuam rau corrosion nyob rau hauv ib puag ncig hnyav, tab sis ductile hlau lub zog superior ua rau nws ua tau zoo dua thaum ua ke nrog kev tiv thaiv txheej xws li epoxy lossis npib tsib xee coatings.
- Cam khwb cia hlau li qub yuav xav tau kev saib xyuas ntau zaus hauv qhov chaw corrosive lossis kev ntxhov siab.
8. Cov lus piav qhia
| Feature | Cast Iron Npauj Npaim Valve | Hlau Npauj Npaim Valve |
| Khoom siv | Grey cam khwb cia hlau, nkig | Nodular hlau, ductile |
| Tensile zog | 20,000-40,000 psi | 60,000-120,000 psi |
| Ductility | Tsawg, nkig | Siab, yoog raws |
| Kev ntsuas siab | Tsawg (150-200 psi) | Siab dua (300 psi lossis ntau dua) |
| Impact Resistance | pluag | Zoo heev |
| Daim ntawv thov | HVAC, dej, tsis tseem ceeb systems | Roj / roj, tshuaj lom neeg, tiv thaiv hluav taws |
| Nqi | qis | Siab dua |
| Corrosion Resistance | Nruab nrab (nrog coatings) | Nruab nrab (zoo dua nrog cov coatings) |
9. Yuav xaiv li cas?
- Xaiv lub cam khwb cia hlau npauj npaim valve yog:
- Koj xav tau cov kev daws teeb meem zoo rau kev siv hluav taws xob tsawg, tsis muaj teeb meem xws li kev siv dej lossis HVAC.
- Lub kaw lus ua haujlwm hauv qhov chaw ruaj khov nrog kev ntxhov siab tsawg lossis kev co.
- Xaiv lub ductile hlau npauj npaim valve yog:
- Daim ntawv thov suav nrog kev kub siab, dynamic loads, lossis corrosive kua.
- Durability, cuam tshuam tsis kam, thiab kev cia siab ntev ntev yog qhov tseem ceeb.
- Daim ntawv thov yuav tsum muaj kev lag luam lossis cov tshuab tseem ceeb xws li kev tiv thaiv hluav taws lossis kev ua tshuaj lom neeg.
10. ZFA VALVE kev pom zoo
Raws li cov chaw tsim khoom nrog ntau xyoo ntawm kev paub hauv npauj npaim li qub, ZFA Valve pom zoo cov hlau nplaum. Tsis tsuas yog nws ua tau zoo, tab sis ductile hlau npauj npaim li qub kuj ua rau pom qhov tshwj xeeb ruaj khov thiab yoog raws hauv kev ua haujlwm nyuaj thiab hloov pauv, txo cov nqi txij nkawm thiab hloov cov nqi, ua rau muaj txiaj ntsig zoo dua rau lub sijhawm ntev. Vim qhov kev thov poob qis rau grey cam khwb cia hlau, cam khwb cia hlau npauj npaim li qub tau maj mam raug txiav tawm. Los ntawm qhov kev xav ntawm cov khoom siv raw, qhov tsis txaus yog nce ntxiv.