Lub rooj zaum ntawm lub valve npauj npaim yog ib qho tseem ceeb ntawm kev sib khi hauv lub valve npauj npaim. Nws lub luag haujlwm tseem ceeb yog kov lub phaj npauj npaim (lub disc valve) thiab tsim ib qho chaw sib khi thaum lub valve kaw kom tiv thaiv kev xau nruab nrab. Tshwj xeeb, lublub rooj zaum npauj npaim valvetuaj yeem ntsia tau rau ntawm phab ntsa sab hauv ntawm lub cev valve lossis tsim los kom sib xyaw nrog lub phaj npauj npaim, vam khom nws cov khoom siv thiab cov qauv kom ua tiav cov txiaj ntsig zoo sealing.
1. Kev Taw Qhia Txog Lub Rooj Zaum Npauj Npaim Valve
1. 1 Kev faib tawm los ntawm cov khoom siv
A. Lub rooj zaum mos mos uas ywj tau
Feem ntau yog hais txog cov ntaub ntawv xws li roj hmab, silicone, polytetrafluoroethylene (PTFE).
Qhov zoo: kev ua tau zoo ntawm kev sib khi, kev teb sai, tsim nyog rau qhov kub thiab txias qis, siab qis thiab cov xov xwm tsis muaj corrosive (tshwj tsis yog PTFE).
Qhov tsis zoo: kev hnav tsis kam tsis zoo, lub neej kev pabcuam raug txwv los ntawm kev laus ntawm cov khoom.
B. Lub rooj zaum hlau
Ua los ntawm stainless hlau, carbon hlau lossis lwm yam khoom siv hlau.
Qhov zoo: ua haujlwm kub siab, ua haujlwm siab, hnav tsis kam, tsim nyog rau kev ua haujlwm hnyav.
Qhov tsis zoo: qhov yuav tsum tau ua kom sib khi hlau-rau-hlau, kev ua tiav nruj thiab kev teeb tsa.
C. Lub rooj zaum sib xyaw ua ke
Muab cov txiaj ntsig ntawm cov hlau thiab cov ntaub ntawv mos, feem ntau yog npog cov qauv hlau nrog cov ntaub ntawv elastic xws li graphite.
Nws tsis yog tsuas yog ua kom muaj kev ua tau zoo ntawm kev sib khi xwb, tab sis kuj tseem txhim kho kev hnav tsis kam thiab kev pabcuam lub neej.
1.2. Kev faib tawm los ntawm cov qauv tsim
A. Lub rooj zaum tom qab tawv
Lub rooj zaum valve thiab nraub qaum yog tsim ua ke, nrog rau cov qauv yooj yim, thiab qhov chaw sealing haum nruj nrog lub cev valve.
Qhov tsis zoo ntawm qhov nolub rooj zaum valve rov qab tawvyog tias thaum lub rooj zaum valve raug hnav lossis laus lawm, tag nrho lub npauj npaim valve yuav tsum tau muab rhuav tshem kom hloov tau.
B. Lub rooj zaum mos uas tshem tau
Lublub rooj zaum mos mostxais yuav tus qauv dovetail thiab tuaj yeem disassembled thiab hloov pauv sib cais.
Qhov zoo dua yog tias nws yooj yim los tswj thiab ua kom lub neej ua haujlwm ntawm lub npauj npaim valve ntev dua.
1.3. Raws li kev tsim tshwj xeeb
A. Ob chav eccentric npauj npaim valve
Lub phaj npauj npaim txav mus raws ob txoj kab eccentric thaum kaw kom txo qhov kev sib txhuam nrog lub rooj zaum valve.
Qhov zoo yog txo qhov hnav, lub sijhawm ntev ntawm lub rooj zaum valve, thiab kev ua haujlwm sealing zoo dua.
B. Peb lub qhov rooj npauj npaim eccentric
Kev tsim qauv ntxiv raws li ob chav eccentricity ua rau lub phaj npauj npaim thiab lub rooj zaum hlau valve ua tiav kev sib cuag hlau-rau-hlau.
Nws tuaj yeem ua tiav qhov tseeb xoom qhov xau thiab tsim nyog rau cov xwm txheej ua haujlwm siab (xws li kub thiab siab siab).
Cov ntaub ntawv ntawm cov rooj zaum valve sib txawv muaj cov yam ntxwv ntawm lub cev thiab tshuaj sib txawv thiab haum rau ntau yam kev ua haujlwm. Hauv tsab xov xwm no, peb feem ntau kawm thiab piv cov hom tseem ceeb, kev ua tau zoo thiab kev siv ntawm cov rooj zaum valve elastic.
Cov rooj zaum valve elastic uas siv ntau hauv khw yog NBR, EPDM, VITON (FKM), roj hmab ntuj (NR), silicone (Silicone Rubber), polyurethane (PU), hydrogenated nitrile roj hmab (HNBR), HYPALON (CSM), PTFE:
2. Kev sib piv ntawm cov khoom siv ntawm lub rooj zaum valve
| Khoom siv | NBR (Roj Hmab Nitrile) | EPDM (Ethylene Propylene Diene Monomer Roj Hmab) | VITON (FKM/Fluorocarbon Roj Hmab) | NR (Roj Hmab Ntuj) | Cov roj hmab silicone | PU (Polyurethane) | HNBR (Hydrogenated Nitrile Roj Hmab) | HYPALON (CSM/Chlorosulfonated Polyethylene Roj Hmab) | PTFE (Polytetrafluoroethylene, Teflon) |
|---|---|---|---|---|---|---|---|---|---|
| Kev Tiv Thaiv Roj | Zoo heev | Txom nyem | Zoo heev (tiv taus roj thiab tshuaj lom neeg) | Txom nyem | Txom nyem | Nruab nrab | Zoo heev (tiv taus roj, roj, thiab cov roj nplua nyeem) | Nruab nrab | Zoo heev (zoo tshaj plaws tshuaj tiv thaiv) |
| Kev Tiv Thaiv Tshuaj | Nruab nrab, tiv taus cov kua qaub thiab cov hauv paus me me | Zoo heev (tiv taus cov kua qaub, cov hauv paus, thiab cov tshuaj oxidizers) | Zoo heev (tiv taus cov kua qaub, cov hauv paus, cov kuab tshuaj organic) | Nruab nrab | Zoo heev (tiv taus cov oxidizers, tsis muaj tshuaj lom) | Nruab nrab | Zoo (tiv taus cov kua qaub thiab cov hauv paus me me) | Zoo heev (tiv taus cov kua qaub, cov hauv paus, thiab cov tshuaj oxidizers) | Zoo heev (tiv taus txhua yam tshuaj lom neeg) |
| Kub thiab txias (°C) | -30 ~ 100 | -40 ~ 120 (ib ntus txog li 150) | -20 ~ 200 | -50 ~ 70 | -60 ~ 230 | -30 ~ 80 | -40 ~ 150 | -40 ~ 130 | -200 ~ 260 |
| Kev Tiv Thaiv Hnav | Zoo | Nruab nrab | Zoo | Zoo heev (ua haujlwm tsis yooj yim) | Nruab nrab | Zoo heev (zoo tshaj plaws hnav tsis kam) | Zoo heev | Zoo | Qias neeg (yooj yim poob qis) |
| Kev Tiv Thaiv Dej | Nruab nrab | Zoo heev (haum rau dej kub thiab pa dej) | Nruab nrab | Zoo | Zoo heev (qib khoom noj) | Nruab nrab | Zoo | Zoo heev | Zoo heev (dej tsis nkag) |
| Kev Tiv Thaiv Huab Cua (UV / Ozone) | Phem (yooj yim laus) | Zoo heev (ua haujlwm tau zoo thaum huab cua kub) | Zoo | Nruab nrab | Zoo heev (tiv taus huab cua hnyav heev) | Nruab nrab | Zoo heev (ua haujlwm tau zoo thaum huab cua kub) | Zoo heev (ua haujlwm tau zoo heev rau huab cua) | Zoo heev (UV thiab kev laus tiv taus) |
| Kev ywj pheej | Zoo | Zoo heev | Nruab nrab | Zoo heev | Zoo heev | Zoo | Zoo heev | Zoo | Nyuaj (kev sib txhuam tsawg) |
| Cov Ntawv Thov Tseem Ceeb | Roj, roj lubricating, hydraulic roj systems, industrial seals | Cov dej xa khoom thiab cov kav dej ntws, cov kav dej tshuaj, cov tshuab ua pa, cov khoom siv sab nraum zoov | Cov ntawv thov tshuaj lom neeg kub siab, cov roj systems, aerospace, petrochemicals | Kev khawb av, cov khoom siv uas tsis yooj yim hnav, cov ntaub thaiv tshuab | Khoom noj, tshuaj, khoom siv hluav taws xob, kev siv kub thiab txias siab | Kev sib khi ua ke, cov khoom siv tiv taus hnav, kev khawb av, cov tshuab hydraulic | Petrochemicals, kev lag luam tsheb, cov roj kub kub | Kev lag luam tshuaj lom neeg, qhov chaw corrosive, cov khoom siv sab nraum zoov, kev sib khi ozone-resistant | Cov tshuaj lom neeg muaj zog corrosive, tshuaj, khoom noj khoom haus-qib sealing, high-kub sealing |
3. Cov Kev Ua Haujlwm Tsim Nyog rau Cov Khoom Siv Rooj Zaum Valve
| Khoom siv | Kev Tiv Thaiv Roj / Roj | Kev Tiv Thaiv Acid / Base | Kev Tiv Thaiv Kub Siab | Kev Tiv Thaiv Kub Qis | Kev Tiv Thaiv Dej | Kev Tiv Thaiv Hnav | Kev Tiv Thaiv Huab Cua (Sab nraum zoov, Ozone) | Qib Khoom Noj |
|---|---|---|---|---|---|---|---|---|
| NBR | ✔ | ❌ | ❌ | ❌ | ❌ | ✔ | ❌ | ❌ |
| EPDM | ❌ | ✔ | ✔ | ✔ | ✔ | ❌ | ✔ | ✔ |
| VITON | ✔ | ✔ | ✔ | ❌ | ❌ | ✔ | ✔ | ❌ |
| NR | ❌ | ❌ | ❌ | ✔ | ✔ | ✔ | ❌ | ❌ |
| Silicone | ❌ | ✔ | ✔ | ✔ | ✔ | ❌ | ✔ | ✔ |
| PU | ❌ | ❌ | ❌ | ❌ | ❌ | ✔ | ❌ | ❌ |
| HNBR | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ❌ |
| HYPALON | ❌ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ❌ |
| PTFE | ✔ | ✔ | ✔ | ✔ | ✔ | ❌ | ✔ | ✔ |
4. Cov Lus Qhia Txog Kev Xaiv Khoom Siv
· Rau roj, roj, lossis roj hydraulic siv→ NBR, HNBR, VITON
· Rau kev tiv taus kua qaub/puag thiab tshuaj lom neeg → EPDM, HYPALON, VITON, PTFE
· Rau kev tiv taus kub siab (>150°C) → VITON, Silicone, HYPALON, PTFE
· Rau cov ntawv thov kub qis (<-40°C) → NR, Silicone, PTFE
· Rau kev hnav thiab kev tiv taus kev sib txhuam siab (kev khawb av, tshuab) → NR, PU, HNBR
· Rau cov dej haus thiab cov khoom noj khoom haus-qib daim ntawv thov → EPDM, Silicone, PTFE
· Rau sab nraum zoov thiab ozone tiv taus→ EPDM, HYPALON, Silicone, PTFE
5. Xaus Lus
· NBR (Roj Hmab Nitrile): Zoo tshaj plaws rau cov roj siv xws li roj, roj hydraulic, tab sis tsis haum rau qhov kub thiab txias thiab cov kua qaub/bases.
· EPDM (Ethylene Propylene Rubber): Zoo tagnrho rau kev kho dej, tshuaj lom neeg, thiab cov tshuab ua pa; tiv taus huab cua heev tab sis tsis tiv taus roj.
· VITON (Fluorocarbon Rubber): Zoo heev rau qhov kub thiab txias, cov kua qaub/bases muaj zog, thiab kev siv roj.
· NR (Roj Hmab Ntuj): Tiv taus kev sib txhuam zoo heev, siv rau hauv kev khawb av thiab tshuab tab sis tsis tiv taus cov tshuaj lom neeg.
· Roj Hmab Silicone: Zoo heev rau qhov kub siab/qis, kev siv rau zaub mov, tab sis tsis muaj kev tiv thaiv kev hnav.
· PU (Polyurethane): Zoo tshaj plaws rau kev tiv taus kev hnav hnyav heev, siv rau hauv cov foob hydraulic thiab cov ntawv thov khawb av.
· HNBR (Hydrogenated Nitrile Rubber): Zoo dua li NBR hauv kev siv kub thiab hnav, siv rau hauv kev lag luam petrochemical.
· HYPALON (CSM/Chlorosulfonated Polyethylene Rubber): Zoo tshaj plaws rau kev tiv taus kua qaub/puag thiab huab cua, zoo tagnrho rau kev kaw ruaj khov uas tiv taus tshuaj lom neeg thiab ozone.
· PTFE (Polytetrafluoroethylene): Tiv taus tshuaj lom neeg tshaj plaws, zoo tagnrho rau qhov kub thiab txias siab, qhov chaw xeb, thiab kev ua zaub mov.