![\"\"](\"https:\/\/zecovalve.com\/wp-content\/uploads\/2022\/01\/20220105083122-61d5575ae65f4.jpg\")
<\/figure>\n<\/div>\n\n\n\u00bfC\u00f3mo funciona una v\u00e1lvula de diafragma?<\/h2>\n\n\n\n
La potencia operativa de una v\u00e1lvula de diafragma puede provenir de una variedad de fuentes. Una v\u00e1lvula de diafragma neum\u00e1tica utiliza presi\u00f3n de aire para abrirla o cerrarla. A veces se emplea un solenoide (un componente met\u00e1lico envuelto en alambre que puede producir un campo magn\u00e9tico en presencia de electricidad) para accionar la v\u00e1lvula. Otras veces, se puede operar manualmente. Adem\u00e1s, tambi\u00e9n se utiliza com\u00fanmente presi\u00f3n hidr\u00e1ulica.<\/p>\n\n\n\n
Tipos de v\u00e1lvulas de diafragma<\/h2>\n\n\n\n- V\u00e1lvulas de diafragma tipo vertedero<\/strong>
- La v\u00e1lvula de diafragma tipo vertedero es uno de los dise\u00f1os m\u00e1s comunes disponibles y es lo que se muestra en la Figura 2, arriba. El dise\u00f1o de labio\/silla elevado es m\u00e1s adecuado para el control de flujo peque\u00f1o y se mantiene a prueba de fugas gracias al casquete sobre el diafragma y el actuador. Este dise\u00f1o es \u00f3ptimo para l\u00edquidos y gases peligrosos o corrosivos, ya que cualquier falla en la membrana quedar\u00e1 contenida por este bonete. Adem\u00e1s, el cuerpo inclinado hace que esta v\u00e1lvula sea inherentemente autodrenante, pero este drenaje puede ocurrir en ambas direcciones de la v\u00e1lvula, lo que puede no ser \u00f3ptimo para algunas aplicaciones. La v\u00e1lvula tipo vertedero se especifica principalmente para fluidos limpios y homog\u00e9neos, ya que se pueden acumular lodos y sedimentos viscosos a ambos lados del asiento. Se encuentran con mayor frecuencia en procesos como aplicaciones alimentarias\/qu\u00edmicas, de producci\u00f3n de gas, corrosivas y de agua.<\/li><\/ul><\/li>
- V\u00e1lvulas de diafragma de paso recto<\/strong>
- La v\u00e1lvula de diafragma de paso directo es estructuralmente similar a las del tipo vertedero; sin embargo, no contiene la caracter\u00edstica silla de montar y en cambio tiene un camino completamente recto. Sus membranas suelen ser m\u00e1s flexibles y permiten un recorrido m\u00e1s largo, ya que deben tocar el fondo de la v\u00e1lvula. Estas v\u00e1lvulas deben recibir mantenimiento o reemplazo con frecuencia, ya que su vida \u00fatil suele ser menor que la de los dise\u00f1os de tipo vertedero debido a sus membranas m\u00e1s flexibles. Las v\u00e1lvulas de diafragma de paso directo se utilizan para lodos, fluidos viscosos y otras aplicaciones donde se debe reducir el bloqueo. Tambi\u00e9n son \u00fatiles para reg\u00edmenes de flujo bidireccional, ya que no hay ning\u00fan soporte que impida el cambio r\u00e1pido de entrada a salida.<\/li><\/ul><\/li><\/ul>\n\n\n\n
\u00bfVentajas de las v\u00e1lvulas de diafragma?<\/h2>\n\n\n\n- Las v\u00e1lvulas de diafragma tambi\u00e9n se pueden utilizar para el servicio de estrangulaci\u00f3n.<\/li>
- Sus caracter\u00edsticas de estrangulamiento son esencialmente las de una v\u00e1lvula de apertura r\u00e1pida debido a la gran \u00e1rea de cierre a lo largo del asiento.<\/li>
- Se encuentra disponible una v\u00e1lvula de diafragma tipo vertedero para controlar flujos peque\u00f1os.<\/li>
- Las v\u00e1lvulas de diafragma son particularmente adecuadas para el manejo de fluidos corrosivos, lodos fibrosos, fluidos radiactivos u otros fluidos que deben permanecer libres de contaminaci\u00f3n.<\/li>
- El mecanismo operativo de una v\u00e1lvula de diafragma no est\u00e1 expuesto a los medios dentro de la tuber\u00eda. Los l\u00edquidos pegajosos o viscosos no pueden ingresar al cap\u00f3 e interferir con el mecanismo operativo.<\/li>
- Muchos fluidos que obstruir\u00edan, corroer\u00edan o engomar\u00edan las piezas de trabajo de la mayor\u00eda de los otros tipos de v\u00e1lvulas pasar\u00e1n a trav\u00e9s de una v\u00e1lvula de diafragma sin causar problemas. Por el contrario, no se puede permitir que los lubricantes utilizados para el mecanismo operativo contaminen el fluido que se manipula.<\/li>
- No hay prensaestopas que mantener y no hay posibilidad de fugas en el v\u00e1stago de las v\u00e1lvulas.<\/li><\/ul>\n\n\n\n\n
Etiquetas relacionadas :<\/h2>\n\n\n\n\n\nV\u00e1lvula ZECO<\/a>\n\n<\/div>\n\n\n\n\nDiferencia entre v\u00e1lvula de compuerta y v\u00e1lvula de mariposa<\/a>\n\n<\/div>\n\n\n\n\n\u00bfQu\u00e9 son las v\u00e1lvulas de globo?<\/a>\n\n<\/div>\n\n\n\n\nv\u00e1lvula de compuerta de accionamiento manual Fabricantes<\/a>\n\n<\/div>\n\n\n\n\n\u00bfQu\u00e9 es una v\u00e1lvula de compuerta?<\/a>\n\n<\/div>\n\n\n\n\nF\u00e1brica de v\u00e1lvulas reductoras de presi\u00f3n de Shanghai<\/a>\n\n<\/div>\n\n\n\n\n\u00bfQu\u00e9 son las v\u00e1lvulas autom\u00e1ticas de control?<\/a>\n\n<\/div>\n\n\n\n\nV\u00e1lvula de globo frente a v\u00e1lvula de bola<\/a>\n\n<\/div>\n\n\n\n\nProveedor de v\u00e1lvulas de compuerta de 12 pulgadas<\/a>\n\n<\/div>\n\n\n\n\nMateriales termopl\u00e1sticos como asiento de v\u00e1lvula de bola y asiento de v\u00e1lvula de mariposa<\/a>\n\n<\/div>","protected":false},"excerpt":{"rendered":"En la mayor\u00eda de las situaciones, las v\u00e1lvulas de diafragma no son una consideraci\u00f3n importante. Pero cuando una v\u00e1lvula puede mejorar su rendimiento en procesos posteriores,... Leer m\u00e1s<\/a><\/p>","protected":false},"author":2,"featured_media":13348,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_generate-full-width-content":"","kt_blocks_editor_width":"","footnotes":""},"categories":[1],"tags":[2702,2704,2703,3205],"class_list":["post-3059","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized","tag-diaphragm-valve","tag-diaphragm-valve-diagram","tag-diaphragm-valve-function","tag-diaphragm-valve-manufacturers","generate-columns","tablet-grid-50","mobile-grid-100","grid-parent","grid-50"],"featured_image_src_large":["https:\/\/zecovalve.com\/wp-content\/uploads\/2022\/01\/20220105083122-61d5575ae65f4.jpg",924,1004,false],"author_info":{"display_name":"Jerry","author_link":"https:\/\/zecovalve.com\/es\/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":2702,"name":"Diaphragm Valve","slug":"diaphragm-valve","term_group":0,"term_taxonomy_id":2702,"taxonomy":"post_tag","description":"","parent":0,"count":3,"filter":"raw"},{"term_id":2704,"name":"diaphragm valve diagram","slug":"diaphragm-valve-diagram","term_group":0,"term_taxonomy_id":2704,"taxonomy":"post_tag","description":"","parent":0,"count":2,"filter":"raw"},{"term_id":2703,"name":"Diaphragm Valve Function","slug":"diaphragm-valve-function","term_group":0,"term_taxonomy_id":2703,"taxonomy":"post_tag","description":"\r\n\r\n\r\n\r\nGET DIAPHRAGM VALVE DIAGRAM INFORMATION<\/strong><\/a>\r\n\r\n\r\n\r\n\r\nWhat is a Diaphragm Valve?<\/h2>\r\n\r\n\r\n\r\n\r\nDiaphragm valves get their name from a flexible disc that comes into contact with a seat at the top of the valve body to form a seal. A diaphragm is a flexible, pressure-responsive element that transmits force to open, close, or control a valve. Diaphragm valves are related to pinch valves, but use an elastomeric diaphragm, instead of an elastomeric liner in the valve body, to separate the flow stream from the closure element.\r\n\r\n\r\n\r\n\r\n![\"\"](\"https:\/\/zecovalve.com\/wp-content\/uploads\/2022\/07\/20220708083634-62c7ec92aba44.jpg\")
<\/figure>\r\n\r\n\r\n\r\nHow do Diaphragm Valves Work?<\/h2>\r\n\r\n\r\n\r\n\r\nDiaphragm valves are simple in construction and operation. A valve actuator is in contact with the inner membrane (or \u201cdiaphragm\u201d) of the valve in its open position. When the user desires the valve to be shut, the actuator is pressed and\/or turned and the membrane is pushed into the edge of the solid damn, closing the valve. Certain diaphragm valves can also have half open\/restricted positions where the membrane is partially closed, allowing a throttled flow through the valve. In the next section, we will examine the broad categories of diaphragm valves and where they are most useful.\r\n\r\n\r\n\r\n\r\nTypes of Diaphragm Valves<\/h2>\r\n\r\n\r\n\r\nWeir-Type Diaphragm Valves<\/h3>\r\n\r\n\r\n\r\n\r\nThe weir-type diaphragm valve is one of the most common designs available and is what is shown in Figure 2, above. The raised lip\/saddle design is best suited for small flow control and is kept leak-proof thanks to the bonnet over the diaphragm and actuator. This design is optimal for dangerous or corrosive liquid and gas, as any failure with the membrane will be kept contained by this bonnet. Also, the sloped body makes this valve inherently self-draining, but this draining can happen in both valve directions which may not be optimal for some applications. The weir-type valve is mostly specified for clean, homogenous fluids, as viscous slurries and sediments may build up on either side of the saddle. They are most often found in processes such as food\/chemical, gas production, corrosive, and water applications.\r\n\r\n\r\n\r\n\r\nStraight Through Type Diaphragm Valves<\/h3>\r\n\r\n\r\n\r\n\r\nThe straight-through diaphragm valve is structurally similar to weir-types; however, it does not contain the characteristic saddle and instead has a completely straight pathway. Their membranes are typically more flexible and allow for farther travel distance, as it must touch the very bottom of the valve. These valves must often be serviced\/replaced, as their lifespan is typically less than weir-type designs due to their more flexible membranes. Straight-through diaphragm valves are used for slurries, viscous fluids, and other applications where blocking must be reduced. They are also useful for bi-directional flow regimes, as there is no saddle to impede swift changing from inlet to outlet.\r\n\r\n\r\n\r\n\r\nDiaphragm Valve Parts<\/h2>\r\n\r\n\r\n\r\n\r\nThe components of diaphragm valves are the following:\r\n\r\n\r\n\r\n\r\nDiaphragm Valve Bonnet<\/h3>\r\n\r\n\r\n\r\n\r\nThe bonnet serves as the top cover and is bolted to the valve body. It protects the compressor, stem, diaphragm, and other non-wetted components of the diaphragm valve.\r\n\r\n\r\n\r\n\r\nDiaphragm Valve Body<\/h3>\r\n\r\n\r\n\r\n\r\nThe valve body is the component directly connected to the pipeline wherein the fluid passes. The flow area inside the valve body depends on the type of diaphragm valve.\r\n\r\n\r\n\r\n\r\n\r\nBoth the valve body and bonnet are constructed from strong, rigid, and corrosive resistant materials.\r\n\r\n\r\n\r\n\r\nDiaphragm Valve Diaphragm<\/h3>\r\n\r\n\r\n\r\n\r\nThe diaphragm is made from a highly elastic polymeric disc that moves down to touch the bottom of the valve body to limit or obstruct the passage of fluid. The diaphragm lifts if the fluid flow rate is to be increased or the valve is to be fully opened. The fluid flows underneath the diaphragm. However, this component limits the valve\u2019s operating temperature and pressure due to the diaphragm\u2019s material and structure. It must also be replaced periodically since its mechanical properties degrade during usage.\r\n\r\n\r\n\r\n\r\n\r\nThe diaphragm isolates the non-wetted components (compressor, stem, and actuator) from the flowing media. Therefore, solids and viscous fluids are less likely to interfere with the operating mechanism of the diaphragm valve. This also protects the non-wetted components from corrosion. Conversely, the fluid in the pipeline will not be contaminated with the lubricant used in operating the valve.\r\n\r\n\r\n\r\n\r\nMaterial of Diaphragm Valve Diaphragm<\/h4>\r\n\r\n\r\n\r\n\r\nUnlined or Rubber Lined Type<\/strong>\r\n\r\n\r\n\r\n\r\n\r\n \t- NR\/Natural Rubber<\/li>\r\n \t
- NBR\/Nitrile\/Buna-N<\/li>\r\n \t
- EPDM<\/li>\r\n \t
- FKM\/Viton<\/li>\r\n \t
- BUNA-N<\/li>\r\n \t
- SI\/Silicone rubber<\/li>\r\n \t
- Leather<\/li>\r\n<\/ul>\r\n\r\n\r\n\r\n\r\nFluorine Plastic Type<\/strong>\r\n\r\n\r\n\r\n\r\n
\r\n \t- FEP, with EPDM backing<\/li>\r\n \t
- PTFE, with EPDM backing<\/li>\r\n \t
- PFA, with EPDM backing<\/li>\r\n<\/ul>\r\n\r\n\r\n\r\n
Diaphragm Valve Compressor<\/h3>\r\n\r\n\r\n\r\n\r\nThe compressor is a disc that lies between the valve stem and the diaphragm. It supports the diaphragm valve and distributes the forces from the stem during linear movement. The compressor design is optimized to provide better flow throttling and control.\r\n\r\n\r\n\r\n\r\nDiaphragm Valve Stem<\/h3>\r\n\r\n\r\n\r\n\r\nThe stem is a vertical shaft connected to the compressor that exerts linear motion to move both compressor and diaphragm, thus operating the diaphragm valve. It transmits the motion exerted by the actuator. Diaphragm valves can either have piston- or threaded-type stems. As the name implies, piston-type valves are moved by a piston assembly inside the bonnet, with the valve stem likely acting as the piston rod. This type requires linear force exerted by fluid pressure. Threaded stem valves have a matching stem nut. This type requires torque to linearly move the stem, as well as lubrication for smooth motion.\r\n\r\n\r\n\r\n\r\n\r\nThe threaded stems of diaphragm valves can have a rising or non-rising mechanism:\r\n\r\n\r\n\r\n\r\n\r\n \t- Rising Stem<\/strong>: Rising stems or indicating stems extend their length up to the handwheel. As the handwheel is turned, the stem rises or descends to open or close the valve, respectively. Hence, it is easier to determine the extent to which the valve is opened by looking at the amount of stem exposed. However, rising stems take up more space than non-rising stems.<\/li>\r\n \t
- Non-Rising Stem:<\/strong> Non-rising stems or non-indicating stems are rotated to open or close the valve, but it does not cause the stem to move up or down. Non-rising stem valves are used in limited spaces, such as in underground piping systems.<\/li>\r\n<\/ul>\r\n\r\n\r\n\r\n
Advantages and Disadvantages of Diaphragm Valves<\/h2>\r\n\r\n\r\n\r\n\r\n
- La v\u00e1lvula de diafragma tipo vertedero es uno de los dise\u00f1os m\u00e1s comunes disponibles y es lo que se muestra en la Figura 2, arriba. El dise\u00f1o de labio\/silla elevado es m\u00e1s adecuado para el control de flujo peque\u00f1o y se mantiene a prueba de fugas gracias al casquete sobre el diafragma y el actuador. Este dise\u00f1o es \u00f3ptimo para l\u00edquidos y gases peligrosos o corrosivos, ya que cualquier falla en la membrana quedar\u00e1 contenida por este bonete. Adem\u00e1s, el cuerpo inclinado hace que esta v\u00e1lvula sea inherentemente autodrenante, pero este drenaje puede ocurrir en ambas direcciones de la v\u00e1lvula, lo que puede no ser \u00f3ptimo para algunas aplicaciones. La v\u00e1lvula tipo vertedero se especifica principalmente para fluidos limpios y homog\u00e9neos, ya que se pueden acumular lodos y sedimentos viscosos a ambos lados del asiento. Se encuentran con mayor frecuencia en procesos como aplicaciones alimentarias\/qu\u00edmicas, de producci\u00f3n de gas, corrosivas y de agua.<\/li><\/ul><\/li>
- V\u00e1lvulas de diafragma de paso recto<\/strong>
- La v\u00e1lvula de diafragma de paso directo es estructuralmente similar a las del tipo vertedero; sin embargo, no contiene la caracter\u00edstica silla de montar y en cambio tiene un camino completamente recto. Sus membranas suelen ser m\u00e1s flexibles y permiten un recorrido m\u00e1s largo, ya que deben tocar el fondo de la v\u00e1lvula. Estas v\u00e1lvulas deben recibir mantenimiento o reemplazo con frecuencia, ya que su vida \u00fatil suele ser menor que la de los dise\u00f1os de tipo vertedero debido a sus membranas m\u00e1s flexibles. Las v\u00e1lvulas de diafragma de paso directo se utilizan para lodos, fluidos viscosos y otras aplicaciones donde se debe reducir el bloqueo. Tambi\u00e9n son \u00fatiles para reg\u00edmenes de flujo bidireccional, ya que no hay ning\u00fan soporte que impida el cambio r\u00e1pido de entrada a salida.<\/li><\/ul><\/li><\/ul>\n\n\n\n
\u00bfVentajas de las v\u00e1lvulas de diafragma?<\/h2>\n\n\n\n
- Las v\u00e1lvulas de diafragma tambi\u00e9n se pueden utilizar para el servicio de estrangulaci\u00f3n.<\/li>
- Sus caracter\u00edsticas de estrangulamiento son esencialmente las de una v\u00e1lvula de apertura r\u00e1pida debido a la gran \u00e1rea de cierre a lo largo del asiento.<\/li>
- Se encuentra disponible una v\u00e1lvula de diafragma tipo vertedero para controlar flujos peque\u00f1os.<\/li>
- Las v\u00e1lvulas de diafragma son particularmente adecuadas para el manejo de fluidos corrosivos, lodos fibrosos, fluidos radiactivos u otros fluidos que deben permanecer libres de contaminaci\u00f3n.<\/li>
- El mecanismo operativo de una v\u00e1lvula de diafragma no est\u00e1 expuesto a los medios dentro de la tuber\u00eda. Los l\u00edquidos pegajosos o viscosos no pueden ingresar al cap\u00f3 e interferir con el mecanismo operativo.<\/li>
- Muchos fluidos que obstruir\u00edan, corroer\u00edan o engomar\u00edan las piezas de trabajo de la mayor\u00eda de los otros tipos de v\u00e1lvulas pasar\u00e1n a trav\u00e9s de una v\u00e1lvula de diafragma sin causar problemas. Por el contrario, no se puede permitir que los lubricantes utilizados para el mecanismo operativo contaminen el fluido que se manipula.<\/li>
- No hay prensaestopas que mantener y no hay posibilidad de fugas en el v\u00e1stago de las v\u00e1lvulas.<\/li><\/ul>\n\n\n\n\n
Etiquetas relacionadas :<\/h2>\n\n\n\n\n
\nV\u00e1lvula ZECO<\/a>\n\n<\/div>\n\n\n\n\nDiferencia entre v\u00e1lvula de compuerta y v\u00e1lvula de mariposa<\/a>\n\n<\/div>\n\n\n\n\n\u00bfQu\u00e9 son las v\u00e1lvulas de globo?<\/a>\n\n<\/div>\n\n\n\n\nv\u00e1lvula de compuerta de accionamiento manual Fabricantes<\/a>\n\n<\/div>\n\n\n\n\n\u00bfQu\u00e9 es una v\u00e1lvula de compuerta?<\/a>\n\n<\/div>\n\n\n\n\nF\u00e1brica de v\u00e1lvulas reductoras de presi\u00f3n de Shanghai<\/a>\n\n<\/div>\n\n\n\n\n\u00bfQu\u00e9 son las v\u00e1lvulas autom\u00e1ticas de control?<\/a>\n\n<\/div>\n\n\n\n\nV\u00e1lvula de globo frente a v\u00e1lvula de bola<\/a>\n\n<\/div>\n\n\n\n\nProveedor de v\u00e1lvulas de compuerta de 12 pulgadas<\/a>\n\n<\/div>\n\n\n\n\nMateriales termopl\u00e1sticos como asiento de v\u00e1lvula de bola y asiento de v\u00e1lvula de mariposa<\/a>\n\n<\/div>","protected":false},"excerpt":{"rendered":"En la mayor\u00eda de las situaciones, las v\u00e1lvulas de diafragma no son una consideraci\u00f3n importante. Pero cuando una v\u00e1lvula puede mejorar su rendimiento en procesos posteriores,... Leer m\u00e1s<\/a><\/p>","protected":false},"author":2,"featured_media":13348,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_generate-full-width-content":"","kt_blocks_editor_width":"","footnotes":""},"categories":[1],"tags":[2702,2704,2703,3205],"class_list":["post-3059","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized","tag-diaphragm-valve","tag-diaphragm-valve-diagram","tag-diaphragm-valve-function","tag-diaphragm-valve-manufacturers","generate-columns","tablet-grid-50","mobile-grid-100","grid-parent","grid-50"],"featured_image_src_large":["https:\/\/zecovalve.com\/wp-content\/uploads\/2022\/01\/20220105083122-61d5575ae65f4.jpg",924,1004,false],"author_info":{"display_name":"Jerry","author_link":"https:\/\/zecovalve.com\/es\/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":2702,"name":"Diaphragm Valve","slug":"diaphragm-valve","term_group":0,"term_taxonomy_id":2702,"taxonomy":"post_tag","description":"","parent":0,"count":3,"filter":"raw"},{"term_id":2704,"name":"diaphragm valve diagram","slug":"diaphragm-valve-diagram","term_group":0,"term_taxonomy_id":2704,"taxonomy":"post_tag","description":"","parent":0,"count":2,"filter":"raw"},{"term_id":2703,"name":"Diaphragm Valve Function","slug":"diaphragm-valve-function","term_group":0,"term_taxonomy_id":2703,"taxonomy":"post_tag","description":"\r\n\r\n\r\n\r\nGET DIAPHRAGM VALVE DIAGRAM INFORMATION<\/strong><\/a>\r\n\r\n\r\n\r\n\r\n
What is a Diaphragm Valve?<\/h2>\r\n\r\n\r\n\r\n\r\nDiaphragm valves get their name from a flexible disc that comes into contact with a seat at the top of the valve body to form a seal. A diaphragm is a flexible, pressure-responsive element that transmits force to open, close, or control a valve. Diaphragm valves are related to pinch valves, but use an elastomeric diaphragm, instead of an elastomeric liner in the valve body, to separate the flow stream from the closure element.\r\n\r\n\r\n\r\n\r\n
<\/figure>\r\n\r\n\r\n\r\nHow do Diaphragm Valves Work?<\/h2>\r\n\r\n\r\n\r\n\r\nDiaphragm valves are simple in construction and operation. A valve actuator is in contact with the inner membrane (or \u201cdiaphragm\u201d) of the valve in its open position. When the user desires the valve to be shut, the actuator is pressed and\/or turned and the membrane is pushed into the edge of the solid damn, closing the valve. Certain diaphragm valves can also have half open\/restricted positions where the membrane is partially closed, allowing a throttled flow through the valve. In the next section, we will examine the broad categories of diaphragm valves and where they are most useful.\r\n\r\n\r\n\r\n\r\n
Types of Diaphragm Valves<\/h2>\r\n\r\n\r\n\r\n
Weir-Type Diaphragm Valves<\/h3>\r\n\r\n\r\n\r\n\r\nThe weir-type diaphragm valve is one of the most common designs available and is what is shown in Figure 2, above. The raised lip\/saddle design is best suited for small flow control and is kept leak-proof thanks to the bonnet over the diaphragm and actuator. This design is optimal for dangerous or corrosive liquid and gas, as any failure with the membrane will be kept contained by this bonnet. Also, the sloped body makes this valve inherently self-draining, but this draining can happen in both valve directions which may not be optimal for some applications. The weir-type valve is mostly specified for clean, homogenous fluids, as viscous slurries and sediments may build up on either side of the saddle. They are most often found in processes such as food\/chemical, gas production, corrosive, and water applications.\r\n\r\n\r\n\r\n\r\n
Straight Through Type Diaphragm Valves<\/h3>\r\n\r\n\r\n\r\n\r\nThe straight-through diaphragm valve is structurally similar to weir-types; however, it does not contain the characteristic saddle and instead has a completely straight pathway. Their membranes are typically more flexible and allow for farther travel distance, as it must touch the very bottom of the valve. These valves must often be serviced\/replaced, as their lifespan is typically less than weir-type designs due to their more flexible membranes. Straight-through diaphragm valves are used for slurries, viscous fluids, and other applications where blocking must be reduced. They are also useful for bi-directional flow regimes, as there is no saddle to impede swift changing from inlet to outlet.\r\n\r\n\r\n\r\n\r\n
Diaphragm Valve Parts<\/h2>\r\n\r\n\r\n\r\n\r\nThe components of diaphragm valves are the following:\r\n\r\n\r\n\r\n\r\n
Diaphragm Valve Bonnet<\/h3>\r\n\r\n\r\n\r\n\r\nThe bonnet serves as the top cover and is bolted to the valve body. It protects the compressor, stem, diaphragm, and other non-wetted components of the diaphragm valve.\r\n\r\n\r\n\r\n\r\n
Diaphragm Valve Body<\/h3>\r\n\r\n\r\n\r\n\r\nThe valve body is the component directly connected to the pipeline wherein the fluid passes. The flow area inside the valve body depends on the type of diaphragm valve.\r\n\r\n\r\n\r\n\r\n\r\nBoth the valve body and bonnet are constructed from strong, rigid, and corrosive resistant materials.\r\n\r\n\r\n\r\n\r\n
Diaphragm Valve Diaphragm<\/h3>\r\n\r\n\r\n\r\n\r\nThe diaphragm is made from a highly elastic polymeric disc that moves down to touch the bottom of the valve body to limit or obstruct the passage of fluid. The diaphragm lifts if the fluid flow rate is to be increased or the valve is to be fully opened. The fluid flows underneath the diaphragm. However, this component limits the valve\u2019s operating temperature and pressure due to the diaphragm\u2019s material and structure. It must also be replaced periodically since its mechanical properties degrade during usage.\r\n\r\n\r\n\r\n\r\n\r\nThe diaphragm isolates the non-wetted components (compressor, stem, and actuator) from the flowing media. Therefore, solids and viscous fluids are less likely to interfere with the operating mechanism of the diaphragm valve. This also protects the non-wetted components from corrosion. Conversely, the fluid in the pipeline will not be contaminated with the lubricant used in operating the valve.\r\n\r\n\r\n\r\n\r\n
Material of Diaphragm Valve Diaphragm<\/h4>\r\n\r\n\r\n\r\n\r\nUnlined or Rubber Lined Type<\/strong>\r\n\r\n\r\n\r\n\r\n
- \r\n \t
- NR\/Natural Rubber<\/li>\r\n \t
- NBR\/Nitrile\/Buna-N<\/li>\r\n \t
- EPDM<\/li>\r\n \t
- FKM\/Viton<\/li>\r\n \t
- BUNA-N<\/li>\r\n \t
- SI\/Silicone rubber<\/li>\r\n \t
- Leather<\/li>\r\n<\/ul>\r\n\r\n\r\n\r\n\r\nFluorine Plastic Type<\/strong>\r\n\r\n\r\n\r\n\r\n
- \r\n \t
- FEP, with EPDM backing<\/li>\r\n \t
- PTFE, with EPDM backing<\/li>\r\n \t
- PFA, with EPDM backing<\/li>\r\n<\/ul>\r\n\r\n\r\n\r\n
Diaphragm Valve Compressor<\/h3>\r\n\r\n\r\n\r\n\r\nThe compressor is a disc that lies between the valve stem and the diaphragm. It supports the diaphragm valve and distributes the forces from the stem during linear movement. The compressor design is optimized to provide better flow throttling and control.\r\n\r\n\r\n\r\n\r\n
Diaphragm Valve Stem<\/h3>\r\n\r\n\r\n\r\n\r\nThe stem is a vertical shaft connected to the compressor that exerts linear motion to move both compressor and diaphragm, thus operating the diaphragm valve. It transmits the motion exerted by the actuator. Diaphragm valves can either have piston- or threaded-type stems. As the name implies, piston-type valves are moved by a piston assembly inside the bonnet, with the valve stem likely acting as the piston rod. This type requires linear force exerted by fluid pressure. Threaded stem valves have a matching stem nut. This type requires torque to linearly move the stem, as well as lubrication for smooth motion.\r\n\r\n\r\n\r\n\r\n\r\nThe threaded stems of diaphragm valves can have a rising or non-rising mechanism:\r\n\r\n\r\n\r\n\r\n
- \r\n \t
- Rising Stem<\/strong>: Rising stems or indicating stems extend their length up to the handwheel. As the handwheel is turned, the stem rises or descends to open or close the valve, respectively. Hence, it is easier to determine the extent to which the valve is opened by looking at the amount of stem exposed. However, rising stems take up more space than non-rising stems.<\/li>\r\n \t
- Non-Rising Stem:<\/strong> Non-rising stems or non-indicating stems are rotated to open or close the valve, but it does not cause the stem to move up or down. Non-rising stem valves are used in limited spaces, such as in underground piping systems.<\/li>\r\n<\/ul>\r\n\r\n\r\n\r\n
Advantages and Disadvantages of Diaphragm Valves<\/h2>\r\n\r\n\r\n\r\n
\r\n - Non-Rising Stem:<\/strong> Non-rising stems or non-indicating stems are rotated to open or close the valve, but it does not cause the stem to move up or down. Non-rising stem valves are used in limited spaces, such as in underground piping systems.<\/li>\r\n<\/ul>\r\n\r\n\r\n\r\n
- Rising Stem<\/strong>: Rising stems or indicating stems extend their length up to the handwheel. As the handwheel is turned, the stem rises or descends to open or close the valve, respectively. Hence, it is easier to determine the extent to which the valve is opened by looking at the amount of stem exposed. However, rising stems take up more space than non-rising stems.<\/li>\r\n \t
- La v\u00e1lvula de diafragma de paso directo es estructuralmente similar a las del tipo vertedero; sin embargo, no contiene la caracter\u00edstica silla de montar y en cambio tiene un camino completamente recto. Sus membranas suelen ser m\u00e1s flexibles y permiten un recorrido m\u00e1s largo, ya que deben tocar el fondo de la v\u00e1lvula. Estas v\u00e1lvulas deben recibir mantenimiento o reemplazo con frecuencia, ya que su vida \u00fatil suele ser menor que la de los dise\u00f1os de tipo vertedero debido a sus membranas m\u00e1s flexibles. Las v\u00e1lvulas de diafragma de paso directo se utilizan para lodos, fluidos viscosos y otras aplicaciones donde se debe reducir el bloqueo. Tambi\u00e9n son \u00fatiles para reg\u00edmenes de flujo bidireccional, ya que no hay ning\u00fan soporte que impida el cambio r\u00e1pido de entrada a salida.<\/li><\/ul><\/li><\/ul>\n\n\n\n