Iyini inani le-CV le-valve: Ukubalwa, i-Flow Coefficient

Iyini i-Flow Coefficient

I-Flow Coefficient, eyaziwa ngokuthi i-Cv (US/EU Standard), i-Kv (International Standard), noma i-C-value, iyipharamitha ebalulekile yobuchwepheshe echaza amandla okugeleza kwamavalvu ezimboni njengamavalvu okulawula kanye nabalawuli.

Ukuchaza Inani le-Cv

I-Valve Cv imele i-flow coefficient ekhombisa ikhono le-valve lokudlulisa uketshezi ngaphansi kwezimo ezithile. Ibala izinga lokugeleza komthamo woketshezi noma igesi nge-valve ekwehleni kwengcindezi ethile. Amanani aphezulu e-Cv abonisa umthamo omkhulu wokugeleza.

Kuyini i-Cv (Inani Lomthamo)

I-Valve Cv (Inani Lomthamo) ilinganisa umthamo wokugeleza futhi ibalwa ngaphansi kwezimo zokuhlola ezijwayelekile:

• Ivalvu ivuleke ngokuphelele

• Ukwehla kwengcindezi (ΔP) kwe-1 psi ngaphesheya kwevalvu

• Uketshezi: Amanzi ku-60°F (15.5°C)

• Izinga lokugeleza: Amagaloni ase-US ngomzuzu (GPM)

Ukuvulwa kweValve vs. Inani le-Cv

I-Cv/Kv kanye nokuvulwa kwevalvu (%) kuyimiqondo ehlukene:

• Incazelo ye-Kv (Izinga laseShayina):Izinga lokugeleza ku-m³/h uma i-ΔP = 100 kPa, ubuningi boketshezi = 1 g/cm³ (amanzi ekushiseni kwegumbi).

*Isibonelo:I-Kv=50 isho ukugeleza okungu-50 m³/h ku-100 kPa ΔP.*

• Amaphesenti Okuvula:Indawo ye-valve plug/disc (0% = ivaliwe, 100% = ivuliwe ngokuphelele).

Ukubala i-Cv kanye nezinhlelo zokusebenza eziyinhloko

I-Cv ithonywa ukwakheka kwevalvu, usayizi, izinto zokwakha, uhlelo lokugeleza, kanye nezakhiwo zoketshezi (izinga lokushisa, ingcindezi, i-viscosity).

Ifomula eyinhloko yile:

I-Cv = Q / (√ΔP × √ρ)

Kuphi:

• U= Izinga lokugeleza kwevolumu

•ΔP= Umehluko wokucindezela

•ρ= Ubuningi boketshezi

Ukuguqulwa: I-Cv = 1.167 Kv

Indima Ekukhetheni Nokuklama Amavalvu

I-Cv ithinta ngqo ukusebenza kahle kohlelo lokulawula uketshezi:

•Inquma usayizi we-valve ofanele kanye nohlobo lwamazinga okugeleza okuqondiwe

•Kuqinisekisa ukuzinza kohlelo (isb., kuvimbela ukujikeleza kwephampu ekuhlinzekweni kwamanzi esakhiweni)

•Kubalulekile ekwenzeni ngcono amandla

Izinguquko ze-Cv Kuzo Zonke Izinhlobo Ze-Valve

Umthamo wokugeleza uyahluka ngomklamo wamavalvu (idatha etholakala ku-Izindinganiso ze-ASME/API/ISO):

Amapharamitha Okugeleza Okuyinhloko kanye Nezici Ezithonyayo

Ukusebenza kwevalvu kuchazwa ngamapharamitha amathathu (ngokwe-Fluid Controls Institute):

1. Inani le-Cv:Ukugeleza kwe-GPM ku-1 psi ΔP (isb., ivalvu yebhola ye-DN50 ≈ 210 vs. ivalvu yesango ≈ 120).

2. I-Coefficient Yokumelana Nokugeleza (ξ):

•Ivalvu yebhabhathane: ξ = 0.2–0.6

•Ivalvu yeglobe: ξ = 3–5

Iziqondiso Zokukhetha kanye Nokucatshangelwa Okubalulekile

Ukulungiswa Kokugoba:

Faka iziphindaphindi ku-Cv (isb., uwoyela ongahluziwe: 0.7–0.9 nge-ISO 5208 ngayinye).

Ama-Smart Valve:

Ukulungiswa kwe-Cv ngesikhathi sangempela (isb., i-Emerson DVC6200 positioner).

Izinhlelo Zokuhlola Ukugeleza Kokusebenza

Ukuhlolwa kudinga izimo ezilawulwayo ngenxa yokuzwela kokulinganisa:

•Ukusethwa (Ngokwesithombe 1):

I-Flowmeter, i-thermometer, ama-valve okubhoboza, i-valve yokuhlola, i-ΔP gauge.

1. Imitha yokugeleza 2. I-Thermometer 3. I-throttle valve engenhla 4 no-7. Izimbobo zokucindezela 5. I-valve yokuhlola 6. Idivayisi yokulinganisa umehluko wokucindezela 8. I-throttle valve engezansi

4. Ibanga eliphakathi komgodi wokucindezela kanye nevalvu liphindwe kabili kunobubanzi bepayipi

7. Ibanga eliphakathi komgodi wokucindezela kanye nevalvu liphindwe kasithupha kunobubanzi bepayipi

•Izilawuli Eziyinhloko:

- I-valve ekhuphukayo ilawula ingcindezi yokungena.

- Ivalvu engezansi igcina ingcindezi ezinzile (usayizi ojwayelekile > ivalvu yokuhlola ukuqinisekisa ukuthi kugeleza ukuminyanainivalvu yokuhlola).

•Amazinga:

I-JB/T 5296-91 (eShayina) vs. BS EN1267-1999 (e-EU).

•Izici Ezibalulekile:

Indawo yokuthepha, ukucushwa kwamapayipi, inombolo kaReynolds (uketshezi), inombolo yeMach (amagesi).

Imikhawulo Yokuhlola Nezixazululo:

•Amavalvu okuhlola izinhlelo zamanje ≤DN600.

•Amavalvu amakhulu:Sebenzisa ukuhlolwa kokugeleza komoya (akuchazwe kabanzi lapha).

Umphumela Wenombolo KaReynolds: Idatha yokuhlola iqinisekisa ukuthi inombolo kaReynolds ithinta kakhulu imiphumela yokuhlolwa.

Izinto Ezibalulekile Okufanele Uzicabangele

•I-Cv/Kv ichaza umthamo wokugeleza kwevalvu ngaphansi kwezimo ezijwayelekile.

•Uhlobo lwevalvu, usayizi, kanye nezakhiwo zoketshezi kuthinta kakhulu i-Cv.

•Ukuhlola kudinga ukunamathela ngokuqinile kumaphrothokholi (JB/T 5296-91/BS EN1267) ukuze kutholakale ukunemba.

•Ukulungiswa kusebenza ekuqineni, izinga lokushisa, kanye nengcindezi.

(Yonke idatha itholakala ezindinganisweni ze-ASME/API/ISO kanye namaphepha amhlophe omkhiqizi wama-valve.)