koob Plunger Valve rau dej ntws regulaiton lub siab regulaiton

Lub plunger valve muaj lub voj voog ntws hla ntu hauv txhua txoj haujlwm qhib. Lub valve muaj kev pom zoo tswj tus cwj pwm tsim kom muaj kev kub ntxhov qis thiab qis cavitation. Qhov hluav taws xob

ntws converges ntawm qhov chaw ntawm lub raj xa dej yog li ntawd yog hais tias muaj vapor npuas tsim, lawv mus rau qhov chaw imploding surrounded los ntawm dej tsis muaj kev puas tsuaj. Lub plunger yog tsav los ntawm tus pas nrig-crank mechanism thiab tuaj yeem muab ntxiv rau kev kho lub tog raj kheej kom kho lub valve tus cwj pwm nkhaus rau qhov xav tau ntawm kev teeb tsa. Nws yog ntau yam valve, nrog lub zog qis, uas tuaj yeem siv los ua kev tswj lub valve (ntws, siab, theem, twj tso kua mis) thiab lub hauv qab tawm valve lossis turbine bypass.

Kev tsim kho raws li hauv qab no:

Cov Outlets Design:

Nta:

Tsim acc. Kev tsim khoom Std lossis EN 1074-5

Qhov ntau thiab tsawg: DN150-DN2200

Siab Siab: PN10, PN16, PN25, PN40 PN63 (CLASS 150 LBS & CLASS 300LBS)

Flanges rau EN 1092-2 / ANSI B16.5, ANSI B16.47A

Khoom muaj

Khoom siv lub cev: Lub cev hlau EN-JS 1030 (GGG-40), GGG50, WCB

Nto: Sab hauv thiab sab nraud epoxy-coated yam tsawg kawg nkaus 250 μm

Plunger 1.4301 * Seals EPDM * Sab hauv qhov chaw thiab pas nrig-crank mechanism hauv stainless hlau Nws pib lubricating txij nkawm-dawb ncej bearings

Piston qhia ntawm bronze overlay

Bolts stainless hlau A4 (EN ISO 3506)

Kev xaiv ua haujlwm:

Actuator possibilities: handwheel thiab gearbox, hluav taws xob actuator, pneumatic actuator, hydraulic brake-and-lift lub tog raj kheej, tus kheej-nruab nrab tsav tswj

Yuav ua li cas kom lub valve sizing:

Peb tab tom ntsuas qhov tseeb valve raws li cov txheej txheem tshwj xeeb, thov muab cov hauv qab no 1) Inlet siab

2) Qhov hluav taws xob siab

3) Xwb, xav sib txawv siab

4) Tus nqi ntws

peb yuav muab Kvs qhov tseem ceeb nrog rau daim duab ntws ntawm lub valve tswj kev ua haujlwm.

Qhov twg:

Kv = Valve flow coefficient (ntws hauv m'/h ntawm 1bar Qhov Nias.)

CV = Valve flow coefficient (ntws hauv gpm ntawm Diff. Xovxwm. 1 psi)

Q = Tus nqi ntws (m3 / h; gpm)

AP = Differential siab (bar; psi)

Gf = Cov kua dej tshwj xeeb (Dej = 1.0)

Qhov twg:

K = Flow resistance los yog Lub taub hau poob coefficient (dimensionless)

AH = Lub taub hau poob (m; taw)

V = Nominal loj ntws tshaj tawm (m / sec; feet / sec.)

g = Acceleration of gravity (9.81 m/sec^2, 32.18 feet/sec^2)

Yuav xaiv qhov hluav taws xob li cas:

• Cavitation tshwm sim

Muaj peb qhov yuav tsum tau ua rau cavitation tshwm sim. Ua ntej, yuav tsum muaj cov npuas roj (nuclei) lossis cov voids hauv cov kua dej uas ua rau lub hauv paus rau vaporization tshwm sim. Qhov thib ob, lub siab sab hauv hauv cov kua yuav tsum poob mus rau lossis qis dua vapor siab. Thib peb, lub siab nyob ib puag ncig lub vapor npuas yuav tsum siab tshaj qhov vapor siab kom nws tawg.

• Tshem tawm cov cavitation: (Anti-cavitation tsim ntawm lub plunger valve)

Kev tiv thaiv cavitation thiab kev tiv thaiv yog ib qho tseem ceeb hauv kev tsim thiab kev ua haujlwm ntawm cov li qub siv hauv cov dej xa dej. Ib tug yuav tsum muaj peev xwm txiav txim siab seb puas muaj cavitation, thiab yog tias yog li ntawd nws qhov kev siv zog thiab cuam tshuam rau lub cev. Cavitation nyob rau hauv li qub yog ib qho kev puas tsuaj uas cuam tshuam rau kev ua haujlwm thiab kev pabcuam ntawm lub valve thiab tshwm sim thaum cov kua ntws los ntawm lub valve txo qis rau lub vapor siab ntawm cov kua ua rau vapor.

kab noj hniav (npaum) tsim. Thaum cov kua dej dhau los ntawm qhov chaw tsis tshua muaj siab mus rau qhov chaw siab dua, lub vapor kab noj hniav yuav tsis ruaj khov thiab tawg. Qhov kev tawg no yog qee zaum hnov ​​lossis pom thiab yog vim li cas peb yuav tsum txhawj xeeb txog nws qhov muaj nyob hauv cov kav dej. Lub cev qhuav dej tuaj yeem ua rau muaj kev kub ntxhov thiab nrog lub suab nrov, kev vibrations, thiab tuaj yeem cuam tshuam kev puas tsuaj rau lub valve lossis ib puag ncig cov kav dej.

Cavitation daim duab 'sigma'

Qhov kev pheej hmoo ntawm cavitation hauv koob li qub tuaj yeem raug soj ntsuam siv qhov sib npaug hauv qab no: σ> σL

Lub valve yuav tsis ua haujlwm hauv cavitation kom txog thaum σ> σL.

Nws nyob qhov twg:

• Cavitation tus nqi σ = Pout / (ΔP + v2/2g)
• Cavitation txwv σL saib daim duab
• ΔP = head loss [mhw]
• Pout = valve qhov hluav taws xob siab
• v = fl uid ceev xa mus rau DN [m/s]
• g = 9,81m/s2

Lub valve yuav tsum tsis txhob ua haujlwm tas mus li nyob rau hauv CAVITATION RISK CONDITIONS. Nws tuaj yeem lees paub tias lub valve ua haujlwm nyob rau hauv cov xwm txheej CAVITATION me ntsis rau lub sijhawm luv luv