1. Ob tug qauv, Ob txoj kev xav
AWWA C500 thiab AWWA C509 yog ob lub koom haum American Water Works Association cov qauv uas tswj cov rooj vag li qub rau cov dej hauv nroog. C500, uas nws phab ntsa- tuab tuab hnub rov qab mus rau tus qauv thawj zaug luam tawm xyoo 1952, npoghlau- rooj vag valves: bronze (los yog stainless hlau) lub rooj rings thiab ob npaug -disc lossis parallel-disc wedge, qhov ntau thiab tsawg ntawm 3 txog 72 ntiv tes. C509, thawj zaug luam tawm nyob rau hauv 1980, formalized tus tsim ntawmresilient- rooj vag li qub- tag nrho cov roj hmab-encapsulated wedge uas nias tawm tsam lub cev lub rooj kom ua tiav npuas- nruj kaw - txais yuav cov pov thawj C500 phab ntsa- tuab. Qhov kev xaiv ntawm lawv tsis yog "qhov twg zoo dua" tab sis "uas phim lub luag haujlwm": C509 yog qhov niaj hnub ua rau cov dej haus thiab kev tiv thaiv hluav taws vim nws xoom- leak sealing thiab tsis tshua muaj kev saib xyuas, thaum C500 tseem yog qhov siv rau kev hloov pauv qub txeeg qub teg thiab rau raw - dej dej ua haujlwm uas cov rooj zaum hlau yuav ua rau cov roj hmab tawg.
2. Qhov txawv ntawm qhov tseem ceeb: sealing, hauv qab tsim, ntws thiab tu
| Feature | AWWA C500 (Metal{1}}Seated) | AWWA C509 (Resilient-Seated) |
|---|---|---|
| Lub hauv paus sealing | Hlau -rau-hlau (feem ntau yog tooj liab-rau-bronze rings) | Rubber-rau-hlau (EPDM/NBR encapsulated wedge) |
| Disc / wedge tsim | Ob chav disc los yog parallel disc | Roj hmab tag nrho -encapsulated resilient wedge |
| Hauv qab ntawm lub cev | Pocketed - zawj rau lub disc; tuaj yeem ntes cov av | Txoj kev du, tsis muaj kev thaiv dej - tsis muaj sediment tsim- nce |
| Shutoff kev ua tau zoo | Kev tso cai tawm ntawm ib tus qauv (tsis yog xoom- leak) | Npuas-tight, xoom- leakage shutoff |
| Flow yam ntxwv | Cov hnab ris tuaj yeem tsim kev kub ntxhov | Puv-bore, ncaj- yeeb nkab-zoo li ntws, tsis tshua muaj siab poob |
| Ua haujlwm torque | Siab dua, complex mechanics | Tsawg dua, kev ua haujlwm du |
| Kev tu | Yooj yim kho hauv - kab | Yooj yim tsim, yooj yim los tswj |
| Qhov ntau thiab tsawg | 3"–72" | Ib tsab ntawv tam sim no - feem ntau me dua - rau - nruab nrab qhov ntau thiab tsawg; sab laj tus qauv tshiab tshaj plaws, nrog rau qhov muaj zog loj - zaum qhov ntau thiab tsawg los ntawm AWWA C515 |
| Yam khoom siv lub cev | Grey hlau los yog hlau hlau | Ductile hlau (tus qauv kev lag luam) |
| Daim ntawv thov | Kev hloov qub txeeg qub teg; dej nyoos nrog hnyav grit / xuab zeb | Cov dej haus, kev tiv thaiv hluav taws, dej khib nyiab |
3. Kev ntsuas siab thiab ntsuas
Ob tus qauv qhia kev ua haujlwm thiab kev sim siab los ntawm qhov loj me. Raws li cov lus qhia dav dav: C500 hlau- zaum li qub hauv 3 "-12" yog ntsuas rau 200 psi (1.38 MPa) ua haujlwm siab nrog 400 psi (2.76 MPa) plhaub kuaj, thaum 14 "-48" li qub tau ntsuas ntawm 150 psi (1.03 MPa) psi (1.03 MPa.0) ua haujlwm nrog qhov loj dua yog qhov project- ntsuas. C509 resilient- rooj zaum li qub feem ntau ntsuas txog 250 psi (1.72 MPa) ua haujlwm siab, nrog lub plhaub hydrostatic test ntawm ob zaug ntawm qhov ntsuas siab thiab lub rooj zaum kuaj ntawm ib zaug ntawm qhov ntsuas siab. Ob lub ntsiab lus tseem ceeb: lub plhaub kuaj ua pov thawj lub cev kev ncaj ncees, thaum lub rooj zaum kuaj pom tias kaw - nug tus neeg muag khoom rau cov ntawv pov thawj kev xeem uas suav nrog ob qho tib si; thiab 2 × plhaub / 1 × lub rooj sib tham txhais tau hais tias C509 valve kuaj ntawm 500 psi plhaub thiab 250 psi lub rooj tau ua kom pom tseeb tias nws xoom- cov chav dej tawm, uas yog tus lej koj tus neeg soj ntsuam yuav txheeb xyuas.
4. Yam twg koj yuav tsum xaiv? Ib Daim Ntawv Qhia Scenario
| Scenario | Pom zoo | Yog vim li cas |
|---|---|---|
| Modern potable dej infrastructure | C509 | Zero to, low torque, low care, hygienic smooth waterway |
| faus hluav taws tiv thaiv tes hauj lwm | C509 | Ductile hlau + cov roj hmab resilient, ntau xyoo ntawm cov npuas txhim khu kev qha- kev pabcuam nruj |
| Kev hloov pauv qub txeeg qub teg | C500 (ua si uas twb muaj lawm) | Tib lub ntsej muag-rau- lub ntsej muag qhov ntev thiab kev ua haujlwm zoo li cov hlau uas twb muaj lawm- rooj zaum li qub |
| Cov dej nyoos nrog hnyav abrasive grit | C500 | Cov rooj zaum hlau tiv thaiv khawb los ntawm cov khib nyiab loj hauv cov khoom nyoos- dej |
| Cov dej khib nyiab / sludge kab | C509 | Rubber wedge resists sediment build-up; paub meej tias EPDM / NBR compatibility nrog cov xov xwm tiag |
Qhov twg cov ntaub ntawv sib tw ua tus qauv, ua raws li lawv. Qhov twg lawv tsis ua, qhov kev txiav txim siab matrix saum toj no - tsav los ntawm qhov yuav tsum tau xau, kev tshaj tawm abrasiveness thiab cov txheej txheem uas twb muaj lawm - yuav ua rau koj mus rau qhov yog cov lus teb hauv cuaj caum feem pua ntawm cov haujlwm.
5. Cov ntawv qhia kev teeb tsa thiab kev yuav khoom
Kev pabcuam faus:qhia lub valve nrog cov txheej txheem uas yuav tsum tau ua (piv txwv li, fusion-bonded epoxy per AWWA C550 rau sab hauv / sab nrauv) thiab faus - pabcuam gearbox lossis qia txuas ntxiv yog tias cov txiv ntoo ua haujlwm yuav tsum ncav cuag qhov chaw.
Kev taw qhia:nruab nrog lub qia ntsug lossis ib qhov project specification; resilient-seed li qub yog kev taw qhia- ywj siab rau kev sib khi tab sis paub meej tias cov kev taw qhia ntws nrog tus neeg muag khoom rau kev ua haujlwm zoo disc.
Flange thiab kev sib koom ua ke:paub meej tias drilling rau ASME B16.1/B16.42 lossis EN 1092-1 thiab hom sib koom ua ke (flanged, mechanical joint, push-on) tiv thaiv cov yeeb nkab hauv koj lub network.
Cov ntaub ntawv pov thawj:thov daim ntawv pov thawj lub plhaub thiab lub rooj zaum nrog cov lej cim, thiab cov ntaub ntawv ntsuas hydrostatic raws li tus qauv xeem ntawv, ua ntej xa khoom.
Spare thiab kho:C509 lub rooj zaum hloov tau thiab tus qauv tsim tso cai rau hauv - kho kab; C500 lub rooj zaum hlau yuav tsum tau muab kev koom tes ntau dua kev kho dua tshiab - qhov no rau hauv tus nqi ntawm lub neej, tsis yog thawj tus nqi xwb.
Cov lus nug nquag
AWWA C509 yog dab tsi?WWA C509 yog tus qauv rau kev ua haujlwm ruaj khov- rooj vag valve rau dej thiab dej khib nyiab, thawj zaug luam tawm xyoo 1980. Nws tau txais cov phab ntsa- tuab ntawm cov hlau- rooj zaum txheem (C500, thawj zaug luam tawm xyoo 1952) thaum hloov lub tswv yim sealing mus rau roj hmab - kaw.}encaps
Dab tsi yog qhov txawv ntawm AWWA thiab ASME / ANSI cov qauv?WWA cov qauv tsom mus rau cov yeeb nkab thiab lub valve sib txuas rau cov dej hauv nroog - qhov ntev, kev sib koom ua ke thiab cov chav kawm siab xav tias cov khoom siv hlau txuas thiab kev ua haujlwm hauv dej. ANSI / ASME cov qauv (xws li, ASME B16.34, B16.5) txhais cov tshuab dav dav, cov qauv ntsia hlau thiab cov chav kawm siab rau cov kav dej. Waterworks tenders feem ntau hais txog AWWA; Cov chaw tsim khoom lag luam hais txog ASME.
Puas yog C500 thiab C509 rooj vag li qub hloov pauv tau?Lub ntsej muag-rau- lub ntsej muag qhov ntev yog qhov zoo sib xws hauv qhov sib tshooj loj, tab sis kev sib khi ua haujlwm, kev ua haujlwm torque, hauv qab geometry thiab kev saib xyuas sib txawv. Interchangeability yuav tsum tau txheeb xyuas qhov project specification - thiab qhov twg xoom to yuav tsum tau, tsuas yog ib tug resilient - zaum (C509) tsim tsim nyog.
Yog vim li cas ib tug resilient - rooj vag valve "zero to" thaum lub hlau - zaum tsis yog?Cov roj hmab -encapsulated wedge deforms elastically tiv thaiv lub cev lub rooj zaum, kaw qhov khoob ntawm qhov chaw nyob hauv kab siab, yog li nws ua tau raws li npuas - nruj lub rooj zaum. Lub rooj hlau -rau-hlau lub rooj tso siab rau kev sib cuag thiab tso cai rau kev txiav txim siab (me me) tso rau ntawm tus qauv - yog li C509 lub rooj zaum kuaj (1 × ntsuas siab) xav kom tsis pom qhov xau thaum C500 tso cai rau tus nqi tswj.
Qhov luaj li cas ntawm txhua tus qauv npog?WWA C500 npog 3 "–72" hlau- rooj vag li qub. AWWA C509's Scope tau hloov zuj zus los ntawm cov ntawv luam tawm - txheeb xyuas cov ntawv tam sim no qhov loj ntawm ntau yam rau kev ua haujlwm zoo - rooj zaum li qub; rau loj resilient- rooj vag li qub, cov neeg yuav khoom feem ntau siv AWWA C515. Paub meej tias tsab ntawv tsim nyog hauv koj qhov kev nug.
Cov kev xeem twg kuv yuav tsum thov thaum xa khoom?Plhaub hydrostatic test (2 × rated siab) thiab lub rooj zaum (1 × rated siab rau C509; ib tus qauv rau C500), nrog rau cov ntaub ntawv pov thawj, ntxiv rau txheej thickness checks (piv txwv li, ib AWWA C550) thiab dimensional verification tiv thaiv tus qauv lub rooj. Kev ntsuam xyuas tim khawv tuaj yeem npaj rau cov haujlwm tseem ceeb.