La fonction g\u00e9n\u00e9rale des vannes est de permettre au fluide de s'\u00e9couler dans une seule direction et d'emp\u00eacher l'\u00e9coulement dans la m\u00eame direction. Habituellement, la vanne fonctionne automatiquement et le disque s'ouvre sous l'action d'une pression de fluide circulant dans une direction. Lorsque le fluide s'\u00e9coule en sens inverse, le disque agit sur le si\u00e8ge par la pression du fluide et l'auto-co\u00efncidence du disque, coupant ainsi l'\u00e9coulement.<\/p>\n\n\n\n
Parmi eux, le clapet anti-retour sans claquement appartient \u00e0 ce type de vanne, qui comprend le clapet anti-retour \u00e0 battant et les ascenseurs\u00a0clapet anti-retour sans claquement<\/strong>. Le clapet anti-retour \u00e0 battant est dot\u00e9 d'un m\u00e9canisme de charni\u00e8re interm\u00e9diaire et d'un disque en forme de porte qui repose librement sur la surface inclin\u00e9e du si\u00e8ge. Afin de garantir que le disque puisse atteindre la position appropri\u00e9e de la surface du si\u00e8ge \u00e0 chaque fois, le disque est con\u00e7u dans un m\u00e9canisme de charni\u00e8re afin que le disque dispose d'un espace de balancement suffisant et mette le disque en contact v\u00e9ritable et complet avec le si\u00e8ge. Les disques de valve peuvent \u00eatre enti\u00e8rement fabriqu\u00e9s en m\u00e9tal ou peuvent \u00eatre en m\u00e9tal incrust\u00e9 de cuir, de caoutchouc ou de rev\u00eatement synth\u00e9tique, en fonction des exigences de performance. Le clapet anti-retour \u00e0 battant n'a presque aucune entrave \u00e0 la pression du fluide lorsqu'il est compl\u00e8tement ouvert, de sorte que la chute de pression \u00e0 travers le clapet est relativement faible. Le si\u00e8ge du disque du clapet anti-retour \u00e0 levage est situ\u00e9 sur la face d'appui du corps de la vanne. En plus de la vanne, le disque peut monter et descendre librement, le reste de la vanne est comme une vanne \u00e0 soupape. La pression du fluide fait monter le disque de la surface d'appui et le reflux du fluide fait retomber le disque sur le si\u00e8ge et coupe l'\u00e9coulement. Selon les conditions de service, le disque peut \u00eatre une structure enti\u00e8rement m\u00e9tallique, ou il peut se pr\u00e9senter sous la forme de patins en caoutchouc ou d'anneaux en caoutchouc int\u00e9gr\u00e9s sur le support de disque. Comme les robinets \u00e0 soupape, les fluides sont \u00e9troits \u00e0 travers les clapets anti-retour \u00e0 levage, de sorte que la chute de pression \u00e0 travers les clapets anti-retour \u00e0 levage est plus grande que celle des clapets anti-retour \u00e0 battant, et le d\u00e9bit des clapets anti-retour \u00e0 battant est limit\u00e9. tr\u00e8s peu.<\/p>\n\n\n\n\n\n Casse de disque et reflux moyen. La surface d'\u00e9tanch\u00e9it\u00e9 est endommag\u00e9e et les impuret\u00e9s sont retenues. La r\u00e9paration de la surface d'\u00e9tanch\u00e9it\u00e9 et le nettoyage des impuret\u00e9s peuvent emp\u00eacher le reflux.<\/p>","protected":false},"excerpt":{"rendered":" La fonction g\u00e9n\u00e9rale des vannes est de permettre au fluide de s'\u00e9couler dans une seule direction et d'emp\u00eacher l'\u00e9coulement dans\u2026 Lire plus<\/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\/fr\/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\nD\u00e9fauts courants des clapets anti-retour et m\u00e9thodes de traitement<\/h2>\n\n\n\n
Les \u00e9checs courants sont\u00a0:<\/h3>\n\n\n\n
La raison de la rupture du disque est que la pression moyenne avant et apr\u00e8s le clapet anti-retour est proche de l'\u00e9quilibre et de l'\u00e9tat de \u00ab scie \u00bb mutuelle, le disque bat souvent avec le si\u00e8ge et le disque est constitu\u00e9 de certains mat\u00e9riaux cassants (tels que la fonte). , laiton, etc.) est cass\u00e9. La pr\u00e9caution consiste \u00e0 utiliser un clapet anti-retour avec le disque comme mat\u00e9riau r\u00e9sistant.<\/p>\n\n\n\nLes raisons du reflux moyen sont les suivantes\u00a0:<\/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
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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