A fun\u00e7\u00e3o geral das v\u00e1lvulas \u00e9 permitir que o meio flua em apenas uma dire\u00e7\u00e3o e impedir o fluxo nessa dire\u00e7\u00e3o. Normalmente, a v\u00e1lvula opera automaticamente e o disco abre sob a a\u00e7\u00e3o de uma press\u00e3o de fluido fluindo em uma dire\u00e7\u00e3o. Quando o fluido flui na dire\u00e7\u00e3o oposta, o disco atua na sede pela press\u00e3o do fluido e pelo disco de autocoincid\u00eancia do disco, interrompendo assim o fluxo.<\/p>\n\n\n\n
Entre elas, a v\u00e1lvula de reten\u00e7\u00e3o anti-slam pertence a este tipo de v\u00e1lvula, que inclui v\u00e1lvula de reten\u00e7\u00e3o anti-slam e elevadores\u00a0v\u00e1lvula de reten\u00e7\u00e3o sem batida<\/strong>. A v\u00e1lvula de reten\u00e7\u00e3o girat\u00f3ria sem batida possui um mecanismo de dobradi\u00e7a intermedi\u00e1rio e um disco semelhante a uma porta repousa livremente na superf\u00edcie inclinada da sede. Para garantir que o disco possa sempre alcan\u00e7ar a posi\u00e7\u00e3o adequada da superf\u00edcie do assento, o disco \u00e9 projetado em um mecanismo de dobradi\u00e7a para que o disco tenha espa\u00e7o de giro suficiente e fa\u00e7a com que o disco entre em contato verdadeiro e abrangente com o assento. Os discos da v\u00e1lvula podem ser feitos inteiramente de metal ou podem ser incrustados de metal com couro, borracha ou cobertura sint\u00e9tica, dependendo dos requisitos de desempenho. A v\u00e1lvula de reten\u00e7\u00e3o anti-batente do tipo swing quase n\u00e3o tem obst\u00e1culo \u00e0 press\u00e3o do fluido quando est\u00e1 totalmente aberta, de modo que a queda de press\u00e3o atrav\u00e9s da v\u00e1lvula \u00e9 relativamente pequena. A sede do disco da v\u00e1lvula de reten\u00e7\u00e3o de eleva\u00e7\u00e3o e n\u00e3o batida est\u00e1 localizada na face de sede do corpo da v\u00e1lvula. Al\u00e9m da v\u00e1lvula, o disco pode subir e descer livremente, o resto da v\u00e1lvula \u00e9 como uma v\u00e1lvula globo. A press\u00e3o do fluido faz com que o disco suba da superf\u00edcie de assentamento, e o refluxo m\u00e9dio faz com que o disco caia de volta para a sede e interrompa o fluxo. De acordo com as condi\u00e7\u00f5es de servi\u00e7o, o disco pode ser de estrutura totalmente met\u00e1lica, ou pode ter a forma de almofadas de borracha ou an\u00e9is de borracha embutidos na cremalheira do disco. Como as v\u00e1lvulas globo, os fluidos s\u00e3o estreitos atrav\u00e9s da eleva\u00e7\u00e3o das v\u00e1lvulas de reten\u00e7\u00e3o sem batida, de modo que a queda de press\u00e3o atrav\u00e9s da eleva\u00e7\u00e3o das v\u00e1lvulas de reten\u00e7\u00e3o sem batida \u00e9 maior do que a das v\u00e1lvulas de reten\u00e7\u00e3o oscilantes sem batida, e o fluxo das v\u00e1lvulas de reten\u00e7\u00e3o oscilantes sem batida \u00e9 limitado muito pouco.<\/p>\n\n\n\n\n\n Quebra de disco e refluxo m\u00e9dio. A superf\u00edcie de veda\u00e7\u00e3o est\u00e1 danificada e as impurezas ficam presas. Reparar a superf\u00edcie de veda\u00e7\u00e3o e limpar as impurezas pode evitar o refluxo.<\/p>","protected":false},"excerpt":{"rendered":" A fun\u00e7\u00e3o geral das v\u00e1lvulas \u00e9 permitir que o meio flua em apenas uma dire\u00e7\u00e3o e impedir o fluxo em\u2026 Ler mais<\/a><\/p>","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_generate-full-width-content":"","kt_blocks_editor_width":"","footnotes":""},"categories":[1],"tags":[3237,2820],"class_list":["post-17225","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-non-slam-check-valve","tag-types-of-check-valve","generate-columns","tablet-grid-50","mobile-grid-100","grid-parent","grid-50"],"featured_image_src_large":false,"author_info":{"display_name":"Jerry","author_link":"https:\/\/zecovalve.com\/pt\/author\/jerry"},"comment_info":0,"category_info":[{"term_id":1,"name":"Uncategorized","slug":"uncategorized","term_group":0,"term_taxonomy_id":1,"taxonomy":"category","description":"","parent":0,"count":452,"filter":"raw","cat_ID":1,"category_count":452,"category_description":"","cat_name":"Uncategorized","category_nicename":"uncategorized","category_parent":0}],"tag_info":[{"term_id":3237,"name":"non slam check valve","slug":"non-slam-check-valve","term_group":0,"term_taxonomy_id":3237,"taxonomy":"post_tag","description":"","parent":0,"count":5,"filter":"raw"},{"term_id":2820,"name":"Types of Check Valve","slug":"types-of-check-valve","term_group":0,"term_taxonomy_id":2820,"taxonomy":"post_tag","description":"\r\n\r\nCheck valves are found in almost every industrial application acting as one-way or non-return valves. Check valves are simple devices that perform a vital function by preventing reverse flows, therefore preventing damage and ensuring efficient operations. Different types of check valves are designed for a specific application. To help you choose the right check valve for your needs, here are a few of the most common types of check valves and their recommended applications. Follow this new blog in Linquip to find out more.\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\nGET TYPES OF CHECK VALVE INFORMATION<\/strong><\/a>\r\n\r\n\r\n\r\n\r\nFalhas comuns da v\u00e1lvula de reten\u00e7\u00e3o sem batida e m\u00e9todos de tratamento<\/h2>\n\n\n\n
As falhas comuns s\u00e3o:<\/h3>\n\n\n\n
A raz\u00e3o para a quebra do disco \u00e9 que a press\u00e3o m\u00e9dia antes e depois da v\u00e1lvula de reten\u00e7\u00e3o sem batida est\u00e1 pr\u00f3xima do equil\u00edbrio e do estado de \u201cserra\u201d m\u00fatua, o disco frequentemente bate com a sede e o disco \u00e9 feito de alguns materiais fr\u00e1geis (como ferro fundido , lat\u00e3o, etc.) est\u00e1 quebrado. A precau\u00e7\u00e3o \u00e9 usar v\u00e1lvula de reten\u00e7\u00e3o anti-batente com o disco como material resistente.<\/p>\n\n\n\nAs raz\u00f5es para o refluxo m\u00e9dio s\u00e3o as seguintes:<\/h3>\n\n\n\n
Working of Types of Check Valves<\/h2>\r\n\r\n\r\n\r\n\r\nAs already stated that a check valve operates on the principle of differential pressure. For a check valve to open, it must attain a minimum upstream pressure known as cracking pressure. Depending on the check valve design and size, the cracking pressure changes. When the upstream pressure reaches the cracking pressure, the valve opens allowing the fluid to enter. When the upstream pressure falls below the cracking pressure, back pressure is generated and the flow attempt to move from outlet to inlet. At this point, the check valve closes, and the flow halts. The closing mechanism of a check valve varies depending on the design and type of the valve. Spring or Gravity pressure normally assist the closing process.\r\n\r\n\r\n\r\n\r\n
Check Valve Types<\/h2>\r\n\r\n\r\n\r\n
Lift Check Valve<\/h3>\r\n\r\n\r\n\r\n\r\nLift-check valves feature a guided disc and a similar seating arrangement as globe valves. The disc is usually in the form of a piston or a ball. There are three body patterns (horizontal, angle, and vertical) that can be installed in horizontal or vertical lines with upward flow.\r\n\r\n\r\n\r\n\r\n\r\nWhen the flow enters below the seat, a disk is raised from the seat by the pressure of the upward flow. When the flow stops or reverses, the backflow and gravity force the disk downward to set on the seat.\r\n\r\n\r\n\r\n\r\n\r\nLift check valves are particularly suitable for high-pressure service where the velocity of flow is high. They are commonly used in high-rise buildings, industrial and power plant applications, and water and wastewater applications. They have no external moving parts and are known to be economical and reliable. Over time, these types of check valves can have high energy costs because the disc remains in the flow stream during operation.\r\n\r\n\r\n\r\n\r\n\r\nThere are two types of lift check valves:\r\n\r\n\r\n\r\n\r\n
Piston Check Valve<\/h4>\r\n\r\n\r\n\r\n\r\nThis type of check valve is also known as a plug check valve. It operates by controlling the flow of fluid in a piping system utilizing the linear motion of a piston within the valve chamber. Sometimes the piston has a spring attached, which helps it stay in the closed position when not in use.\r\n\r\n\r\n\r\n\r\n
Ball Check Valve<\/h4>\r\n\r\n\r\n\r\n\r\nThe ball check valve operates simply using gravity. When there is enough pressure in the flow, the ball is lifted upward, and when the pressure is decreased, the ball rolls down and closes the opening. Ball Check Valves come in a wide range of material types and style types.\r\n\r\n\r\n\r\n\r\n
Swing Check Valve<\/h3>\r\n\r\n\r\n\r\n\r\nSwing Check Valves are available in straight body design and y-pattern design. The disk is suspended from the body by means of a hinge pin and seals against the seat which is integral to the body.\r\n\r\n\r\n\r\n\r\n\r\nThese valves are typically used in sizes 2 inches and over. Swing check valves can be installed in both horizontal and vertical positions. They are not suitable for pulsating flow.\r\n\r\n\r\n\r\n\r\n\r\nThe closure response of the swing check valve is slower compared to the lift check valve due to longer disc travel and inertia of the disk.\r\n\r\n\r\n\r\n\r\n
Specifications of Swing Check Valve<\/h4>\r\n\r\n\r\n\r\n
\r\n \t
Tilting Disc Check Valve<\/h3>\r\n\r\n\r\n\r\n\r\nThe tilting disc check valve is similar in appearance to an eccentric butterfly valve. The valve body is double\u2010flanged and of a short length. The disc is held in place via a shaft which is positioned eccentrically from the body centreline in both the horizontal and vertical axes.\r\n\r\n\r\n\r\n\r\n\r\nThe double eccentricity of the shaft results in the lower section of the disc occupying a greater area in the flow path. Consequently, the disc begins to open at very low flow rates. The tilting disc check valve is therefore commonly used in pumping systems with low flow rates and also for pulsating flows.\r\n\r\n\r\n\r\n\r\n\r\nDuring flow reversal, the disc closes due to gravity and the upper part of the disc above the shaft centreline pushes against the flow thus acting as a hydraulic brake that cushions the disc as it returns to the closed position. Tilting disc valves can be supplied with optional levers and weights to adjust the closing characteristics of the valve. As such, the tilting disc check valves are well suited to reduce the risk of water hammers.\r\n\r\n\r\n\r\n\r\n
Butterfly Check Valve<\/h3>\r\n\r\n\r\n\r\n\r\nA butterfly check valve is known as a dual plate check valve, folding disc check valve, double-disc, or split disc check valve. As the name suggests, two halves of the disk move towards the centerline with the forward flow, and with reverse flow two halves open and rest on the seat to close the flow.\r\n\r\n\r\n\r\n\r\n\r\nThese types of check valves are good for low-pressure liquid systems as well as gas piping systems. Its lightweight and compact construction make it a preferable choice when space and convenience are important. Besides, it is 80 to 90% lighter than the conventional full-body check valve and the cost of installation and maintenance is lower compared to other types.\r\n\r\n\r\n\r\n\r\n
Stop Check Valve<\/h3>\r\n\r\n\r\n\r\n\r\nStop-check valves can be used for many applications. They\u2019re designed to start, stop, and regulate the flow of materials, and they help to prevent backflow.\r\n\r\n\r\n\r\n\r\n\r\nIf the pressure in the system is too low, these valves will automatically close to prevent reverse flow. As a result, damage usually caused by backflow is prevented.\r\n\r\n\r\n\r\n\r\n\r\nstop-check-valveThese types of check valves also work with an external mechanism or an override control. With these, you can set the valve to close regardless of flow direction or pressure to ensure safe and efficient operations.\r\n\r\n\r\n\r\n\r\n\r\nGenerally, stop-check valves are used in power plants and boiler systems. They\u2019re also beneficial for petroleum production and refining, hydrocarbon processing, and high-pressure safety services.\r\n\r\n\r\n\r\n\r\n
Diaphragm Check Valve<\/h3>\r\n\r\n\r\n\r\n\r\nDiaphragm check valves consist of rubber flexing diaphragms or self-centering discs for preventing backflow. When the inlet pressure is increased, the diaphragm flexes open, and flow starts. There are two types of diaphragm check valves;\r\n\r\n\r\n\r\n\r\n
\r\n \t
Spring Loaded Check Valve<\/h3>\r\n\r\n\r\n\r\n\r\nThere are two types of Spring Loaded Check Valves; Spring Loaded in-line valves and Spring loaded Y-valves.\r\n\r\n\r\n\r\n\r\n
Spring Loaded in-line valve<\/h4>\r\n\r\n\r\n\r\n\r\nIn-line valves are also known as Nozzle Check Valves or Silent Check Valves. These valves employ a centrally guided stem-disc assembly along with a compression spring. To open the valve, the flow pressure must be more than the spring force and cracking pressure. In that case, the flow pushes the disc allowing the flow. When the inlet pressure reduces, the spring pushes the disc against the orifice and shut the valve.\r\n\r\n\r\n\r\n\r\n
Spring Loaded Y-valve<\/h4>\r\n\r\n\r\n\r\n\r\nThe operating principle of Spring-loaded y-check valves is similar to in-line check valves. The only difference is that the spring and movable disc are located at an angle to form a \u2018y\u2019 shape. The main advantage of Y-type check valves is that they can be inspected and serviced while the valve is still connected to the system.\r\n\r\n\r\n\r\n\r\n
Foot Check Valve<\/h3>\r\n\r\n\r\n\r\n\r\nA foot valve is a check valve that has a strainer installed on the inlet side to prevent debris from entering the valve.\r\n\r\n\r\n\r\n\r\n
Duckbill Check Valve<\/h3>\r\n\r\n\r\n\r\n\r\nDuckbill Check Valves are unique, one-piece, elastomeric components that enable flow to proceed through a soft tube that feeds into the downstream side of the valve wherein back pressure collapses the tube and cuts off the flow.\r\n\r\n\r\n\r\n\r\n
Wafer Check Valve<\/h3>\r\n\r\n\r\n\r\n\r\nWafer check valves are very slim and compact in design and use a swinging disc to allow or block flow. They are lightweight and suitable for various applications. They are economical and are available in various sizes. The following figure shows the typical working of a Wafer Check Valve.\r\n\r\n\r\n\r\n\r\n\r\nWafer check valves are ideal for services requiring low-pressure loss as the valve operation takes place at a very low-pressure difference.\r\n\r\n\r\n\r\n\r\n
Silent Check Valve<\/h3>\r\n\r\n\r\n\r\n\r\nSilent check valves are incredibly useful for water pipelines and systems. These valves are engineered to control and protect against pressure surges that can occur in water lines. They also work to prevent water hammer and reverse flow.\r\n\r\n\r\n\r\n\r\n\r\nSilent check valves are constructed with a spring-assisted disc. When the fluid pressure in the valve is higher than the cracking pressure, or the pressure needed open or close the valve, the spring lowers the disc to prevent reverse flow.\r\n\r\n\r\n\r\n\r\n\r\nThe valve is also manufactured to include a guide to keep the disc moving in vertically. This allows it to reseat properly.\r\n\r\n\r\n\r\n\r\n
Non-slam Check Valve<\/h3>\r\n\r\n\r\n\r\n\r\nThe swing check valve closes abruptly because of gravity and causes a pressure surge resulting in shock waves.\r\n\r\n\r\n\r\n\r\n\r\nThese high-pressure waves cause severe stress on the piping system.\r\n\r\n\r\n\r\n\r\n\r\nThis problem can be minimized by installing a Non-Slam type check valve. Non-Slam check valves do not rely on gravity. As the upstream velocity of the fluid slows the spring assist on the valve start to close the disc.\r\n\r\n\r\n\r\n\r\n\r\nBy the time the upstream velocity comes to 0, the disc is completely closed. With the reverse flow eliminated, the force necessary to produce a water hammer on either side of the valve is substantially reduced.\r\n\r\n","parent":0,"count":13,"filter":"raw"}],"taxonomy_info":{"category":[{"value":1,"label":"Uncategorized"}],"post_tag":[{"value":3237,"label":"non slam check valve"},{"value":2820,"label":"Types of Check Valve"}]},"yoast_head":"\n