Post on 07-Apr-2016
Educational ServicesEducational Services
Control Valve Control Valve SpecificationsSpecifications
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3 Principais Componentes3 Principais Componentes
Control Valve
Actuator
Valve Body Assembly
Valve Bonnet
Valve Body
A3899
Figure 1-1. Control Valve Assembly
Corpo
Atuador
O 3o elemento são os acessórios.Entre eles os mais importantes são os POSICIONADORES.
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FunFunção da Válvula na Malha de Controleção da Válvula na Malha de Controle
I/P
PT
PIC
P
loop Figure 1-2. Válvula de Controle no Loop
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ImportImportâância dncia da a Válvula de ControlVálvula de Controlee
Parte do sistema de instrumentaçãoParte do sistema de tubulaçãoAfeta dinâmicamente o ganho da malha de controleÉ o elemento mais caro da malhaManipula a energia do processo, consome peças de reposiçãoToda a inteligência do sistema de controle é levada ao processo através dela - afeta diretamente produtividade do processoPor tudo isto é geralmente o elemento mais difícil de especificarNota: As válvulas de controle se parecem no papel, mas existem grandes diferenças entre elas
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Válvulas Globo: Componentes TípicosVálvulas Globo: Componentes Típicos
Seat Ring & gasket (Sede e
Junta da Sede)
Gasket (Juntas)
Bonnet (Castelo)
Cage (or seat ring retainer) (Gaiola)
Packing (Engaxetamento)
Stem (Haste)
Piston Ring (Anéis)
Valve Body (Corpo)
Plug (Obturador)
Studs & nuts (Prisioneiros e Porcas)
Packing flange, studs (Prensa Gaxeta)
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ANSI Class Pressure/TemperatureANSI Class Pressure/Temperature
Temperature, degrees F
Pres
sure
- Ps
ig
4000
3200
3600
2800
2400
2000
1600
1200
800
400
0200 400 600 800 1000
Pres
sure
- Ba
r200
250
150
100
50
0
0 100 200 300 400 500
Temperature, degrees C
Class 150
Class 300
Class 900
Class 1500
Class 600
ansi1
Figure 1-4. ANSI Class Pressure/Temperature Ratings for Bodies and Bonnets
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Limites de Temperatura Limites de Temperatura
Material Temperature Limit
Carbon Steel(WCC, WCB)
-20 to 800 degrees F
Alloy steel, or chrome moly steelC5WC9
-20 to approximately 1200 degrees F-20 to approximately 1100 degrees F
CF8M Stainless Steel(316 Stainless Steel)
-425 to 1500 degrees F
Figure 1-5. Temperature Limits Of Common Valve Body And Bonnet Materials
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Conexões: RoscadasConexões: Roscadas
A6411
Figure 1-6. Threaded End Connections
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Conexões: SoldadasConexões: Soldadas
Butt Welding Ends Socket Welding Ends
A6410
Figure 1-7. Welded End Connections
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Conexões: FlangeadasConexões: Flangeadas
Raised-Face Flange Flat-Face Flange
A6408
Figure 1-8. Raised-Face And Flat-Face Flanges
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Conexões: Flanges Soltos & RTJConexões: Flanges Soltos & RTJ
Flange
Split Ring
Body
Separable Flanges Ring-Type Joint (RTJ)
A6409
Figure 1-9. Separable Flanges And Ring Type Joints
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Conexões: Wafer Conexões: Wafer
A5557
Figure 1-10. Wafer Style Valve Body
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Tabelas de Cv (Capacidade de Vazão)Tabelas de Cv (Capacidade de Vazão)
Flow DownDESIGN ED
CLASSES 125-600Equal Percentage Cage
Full Sized Restricted
FLOW COEFFICIENTS(ANSI/ISA/IEC)
For additional body information seeBulletin 51.1:ED
Equal Percentage Equal PercentageCharacteristic
PortDiameter
TotalTravel
Valve opening __Percent of Total TravelBodySize(In.) In. mm In. mm 10 20 30 40 50 60 70 80 90 100
FL
Cv1&1-1/4 1-5/16 33.3 3/4 19 .783 1.54 2.20 2.89 4.21 5.76 7.83 10.9 14.1 17.2 .881-1/2 1-7/8 47.6 3/4 19 1.52 2.63 3.87 5.41 7.45 11.2 17.4 2/45 30.8 35.8 .84
2 2 5/16 58.7 1 1/8 29 1.66 2.93 4.66 6.98 10.8 16.5 25.4 37.3 50.7 59.7 .852-1/2 2 7/8 73.0 1 1/2 38 3.43 7.13 10.8 15.1 22.4 33.7 49.2 71.1 89.5 99.4 .84
3 3 7/16 87.3 1-1/2 38 4.32 7.53 10.9 17.1 27.2 43.5 66.0 97.0 120 136 .824 4 3/8 111.1 2 51 5.85 11.6 18.3 30.2 49.7 79.7 125 171 205 224 .826 7 177.8 2 51 12.9 25.8 43.3 67.4 104 162 239 316 368 394 .858 8 203.2 2 51 18.5 38.0 58.4 86.7 130 189 268 371 476 567 .858 8 203.2 3 76 27.0 58.1 105 188 307 478 605 695 761 818 .86
1 1/2 1-5/16 33.3 3/4 19 1.112 1.56 2.22 3.10 4.27 6.17 9.01 13.1 18.2 23.1 .912 1-5/16 33.3 3/4 19 .923 1.42 2.09 2.84 4.11 5.83 8.58 12.8 18.5 24.3 .88
Cv = GPM Of Water At 60 degrees F with ?P of 1 psi
Figure 1-11. Example of a Typical Sizing Page
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Comparação Cv : Rotativas x GloboComparação Cv : Rotativas x Globo
Valve Size Travel, Percent Rated CvSliding-StemTortuous Path
Rotary-ShaftStreamlinedFlow Path
1 inch 90 20 2910 3 0.5
8 inch 90 500 118010 20 5
Figure 1-12. Relative Liquid Capacity Of Sliding-Stem And Rotary-Shaft Control Valves
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Classes de Vazamento ANSI/FCI 70-2 Classes II a VClasses de Vazamento ANSI/FCI 70-2 Classes II a V
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Classe de Vedação ANSI/FCI 70-2 Clase VIClasse de Vedação ANSI/FCI 70-2 Clase VI
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FIN