{"id":3671,"count":8,"description":"\r\n\r\nOBTER INFORMA\u00c7\u00d5ES SOBRE O SENTIDO DO FLUXO DA V\u00c1LVULA DE GLOBO<\/strong><\/a>\r\n\r\n\r\n\r\n\r\n\r\n\r\n

V\u00e1lvula de globo Dire\u00e7\u00e3o do fluxo<\/h2>\r\n\r\n\r\n\r\n\r\nV\u00e1lvulas de globo<\/a> tornaram-se uma das v\u00e1lvulas mais utilizadas em empresas de quase todos os sectores. E com a sua capacidade de iniciar, parar e acelerar o fluxo de fluido numa tubagem, \u00e9 f\u00e1cil perceber porqu\u00ea.\r\n\r\n\r\n\r\n\r\n\r\nGenerally speaking, the flow of globe vales is from down to up. It means the medium will go through from the disc downside and then out by the upside. Globe valves usually adopt a compulsory sealed design, so closing the valve offer pressure to the disc against the seat. So if you want to open the valve, the globe valve disc must overcome resistance made by stem and packing friction, medium pressure will offer adverse pressure which helps open the valve. It means you can use less force than the closing valve. So the stem diameter should be larger, to avoid stem bending fault. (depending on the metal material's physical performance of the stem ). In recent years, there are more and more valve pressure seals, the medium through the upper disc to the down disc, so the close valve force is smaller than the open valve force, valve shaft diameter is allowed to be smaller.\r\n\r\n\r\n\r\n\r\n\r\nMas algumas opini\u00f5es discordam, especialmente para uma v\u00e1lvula de globo com um tamanho maior (por exemplo, um tamanho maior que DN250), a v\u00e1lvula de globo geralmente adopta uma veda\u00e7\u00e3o de press\u00e3o da v\u00e1lvula, e considerando a for\u00e7a da v\u00e1lvula de fecho, \u00e9 f\u00e1cil alcan\u00e7ar o desempenho da veda\u00e7\u00e3o. Mas deve ter em considera\u00e7\u00e3o a estabiliza\u00e7\u00e3o da v\u00e1lvula quando o di\u00e2metro da haste da v\u00e1lvula \u00e9 inferior ao di\u00e2metro da sede.\r\n\r\n\r\n\r\n\r\n\r\nMas como \u00e9 que estas v\u00e1lvulas funcionam exatamente e qual \u00e9 o fluxo de dire\u00e7\u00e3o da v\u00e1lvula de globo?\r\n\r\n\r\n\r\n\r\n

Como \u00e9 que as v\u00e1lvulas de globo funcionam?<\/h2>\r\n\r\n\r\n\r\n\r\nUma v\u00e1lvula de globo \u00e9 concebida principalmente para parar, iniciar e regular o fluxo. \u00c9 composta por um disco m\u00f3vel e um assento de anel estacion\u00e1rio num corpo geralmente esf\u00e9rico. A sede de uma v\u00e1lvula de globo encontra-se no meio e paralela \u00e0 tubagem, e a abertura na sede \u00e9 fechada com o disco. Quando o man\u00edpulo \u00e9 rodado, manualmente ou atrav\u00e9s de um atuador, um disco \u00e9 baixado ou levantado atrav\u00e9s da haste da v\u00e1lvula. Quando o disco est\u00e1 completamente baixado, o fluxo de fluido \u00e9 interrompido. Quando o disco est\u00e1 totalmente levantado, o caudal de fluido est\u00e1 no seu m\u00e1ximo. Quando o disco \u00e9 elevado para um n\u00edvel inferior ao m\u00e1ximo, o caudal de fluido \u00e9 regulado proporcionalmente ao curso vertical do disco.\r\n\r\n\r\n\r\n\r\n

V\u00e1lvula de globo Dire\u00e7\u00e3o do fluxo<\/strong><\/h2>\r\n\r\n\r\n\r\n\r\n-Para aplica\u00e7\u00f5es a baixa temperatura, as v\u00e1lvulas de globo e de \u00e2ngulo s\u00e3o normalmente instaladas de modo a que a press\u00e3o seja exercida sob o disco. Isto promove uma opera\u00e7\u00e3o f\u00e1cil, ajuda a proteger o empanque e elimina uma certa quantidade de a\u00e7\u00e3o erosiva nas faces da sede e do disco.\r\n\r\n\r\n\r\n\r\n\r\n-Para servi\u00e7o de vapor a alta temperatura, as v\u00e1lvulas de globo s\u00e3o instaladas de modo a que a press\u00e3o esteja acima do disco. Caso contr\u00e1rio, a haste contrai-se com o arrefecimento e tende a levantar o disco do assento (e a apresentar fugas).\r\n\r\n\r\n\r\n\r\n

Fluxo para abrir (FTO)<\/h3>\r\n\r\n\r\n\r\n\r\nAlso referred to as standard or forward flow, or in globe valves, flow under the seat. Think about when you've controlled the flow of water from a garden hose with your thumb. Your thumb acts like the face of the plug in a globe valve - flow is pushing against your thumb to open a flow path for the water.\r\n\r\n\r\n\r\n\r\n

Fluxo para fechar (FTC)<\/h3>\r\n\r\n\r\n\r\n\r\nTamb\u00e9m designado por fluxo inverso ou, nas v\u00e1lvulas de globo, fluxo sobre a sede. Considere um buj\u00e3o de drenagem numa banheira. A dire\u00e7\u00e3o do fluxo \u00e9 contra a parte de tr\u00e1s ou superior do buj\u00e3o (e n\u00e3o contra a face), criando uma tend\u00eancia para o buj\u00e3o se fechar no ralo.\r\n\r\n\r\n\r\n\r\n
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