Válvulas industriales según normas API · ASME · DIN · EN
Válvulas de mariposa con camisa
Las válvulas de mariposa con camisa mantienen fluidos que solidifican, cristalizan o espesan a temperatura ambiente en estado fluido: el cuerpo lleva una camisa completa de calefacción por la que circula vapor, aceite térmico o agua caliente, de modo que betún, azufre, chocolate, ceras y adhesivos permanecen líquidos hasta el disco. El rango de tamaños, la cobertura de clase, los materiales del cuerpo y las conexiones se confirman por tamaño y ejecución en la solicitud de oferta; el medio y la temperatura de la camisa se eligen frente a las condiciones de proceso. La construcción de la camisa se gradúa por cobertura: las camisas parciales calientan la sección media del cuerpo a través de bridas estándar, las camisas de cobertura completa usan bridas de conexión de uno a dos tamaños nominales por encima del tamaño de línea, y las camisas de tamaño de línea se sueldan a bridas estándar — de ahí que la cara a cara se cotice como ISO 5752 "o plano de fabricante aprobado", y los puertos térmicos pasan de 1/2" NPT en válvulas pequeñas a 1" en cuerpos de 8" y superiores. Los asientos metálicos con superficies de sellado con recubrimiento duro soportan el extremo caliente del rango de -29 a 425 °C según material. Las vías de fallo son térmicas más que mecánicas: las camisas de abrazadera dejan puntos fríos con cámara de aire donde el medio solidifica, el producto acumulado en el borde del disco bloquea la apertura o el cierre, y el medio solidificado en el cojinete del eje agarrota el vástago — los diseños con vástago trazado por vapor y cojinete estanque responden al último. La instalación enruta el medio de la camisa en una conexión y lo devuelve por el lado opuesto con espacio anular dimensionado frente a puntos calientes y fríos, y la aceptación es doble: prueba hidráulica de la camisa según ASME B31.1, lado de proceso según API 598. Las normas de producto son las de mariposa (API 609, MSS SP-68, EN 593) mientras la carcasa de la camisa sigue la práctica de tubería (ASME B31.1/B31.3, B16.34); las ejecuciones de alta prestación con camisa llegan a Class 600 con límites presión-temperatura de B16.34. La selección depende del medio y la temperatura de calefacción de la camisa, de los materiales de cuerpo y asiento frente a la química del medio, y del accionamiento — manual, neumático o eléctrico.
Parte de la Válvulas de mariposa familia
Última actualización: 2026-10
Especificaciones de la familia
| jacket coverage design types | Jacketed valve executions are commonly grouped by coverage: a partial jacket heats only the valve mid-section with standard flanges, a full-coverage jacket uses flanges one nominal size above the valve size, and a line-size full jacket welds to standard flanges with tapped bolt-hole inserts. Shorter end-to-end variants of each also exist. |
|---|---|
| jacket flange oversize effect | Because the jacket adds wall thickness around the body, the connecting flanges of a jacketed butterfly valve are typically one to two nominal sizes larger than the equivalent unjacketed valve; final flange dimensions must be taken from the approved manufacturer drawing rather than assumed from the line size. |
| jacket pressure and medium separation | The jacket pressure rating, heating-medium temperature and connection size are not fixed catalog values: they must be confirmed against the process conditions for each application. The heating medium must also remain fully separated from the process medium, so jacket integrity is a containment requirement, not only a heat-transfer one. |
| jacket thermal port sizing | Thermal (steam) port size is scaled to valve size: roughly half-inch NPT on small valves, three-quarter-inch on mid sizes, and one-inch NPT on valves of about 8 inch and larger. Threaded ports are standard on fabricated jackets, with flanged jacket connections available on request. |
| jacket heating medium options | Steam is the most common jacket heating medium, but hot thermal oil is also used, and jacketed valves can serve cooling duty with cold water or chilled glycol. Manufacturer selection checklists therefore ask explicitly whether the jacket medium is steam or hot oil, together with its pressure and temperature. |
| temperature range material dependent | Published temperature limits for jacketed metal-seated butterfly valves run to about 425 C, but the applicable ceiling depends on body/trim material and the sealing configuration rather than being a single valve rating. Soft-seated executions share this envelope only in their lower part; metal seating with hard-faced surfaces carries the high end. |
| hardfaced metal seat for hot service | In jacketed executions the seat faces are typically metal, with the disc sealing surface hard-faced with a cobalt-based alloy to resist wear at elevated temperature; stainless seal rings combine hard-metal and elastic sealing behavior across the low- and high-temperature ends of the range. |
| partial jacket cold spots | Add-on (clamp-on) jackets can leave air gaps between the jacket and the valve body; these cold spots let the media solidify and accumulate locally, which is why integral welded jackets that keep steam in direct contact with the body give more reliable heating on solidifying service. |
| disc edge buildup blocks closure | A thin layer of solidified product on the disc edge can prevent the valve from opening or closing, while buildup on the disc face alters its flow-control behavior. Heating only the body does not protect the disc; designs that trace steam around the disc circumference address this failure path. |
| shaft bearing solidification binding | The shaft/bearing area is the most vulnerable point for media buildup: even a small amount of solidified flow material on a bearing surface causes binding and wear. Steam-traced or purged stem designs, and sealed bearings, are countermeasures; without them, conventional body-only jacketing leaves the shaft cold. |
| clamp on jacket valve failure risk | Reliance on conventional clamp-on jacketing is itself a failure mode: where heat transfer is poor, sulfur-type media can still solidify inside the valve and the buildup leads to valve failure, particularly where shafts and discs sit far from the heat source. |
| annular space hot cold spots prevention | For fabricated jackets, maintaining sufficient annular space between the valve exterior and the inner jacket wall keeps the thermal fluid flowing unobstructed; collapsing or under-sizing this gap produces temperature inconsistencies and hot or cold spots across the heated surface. |
| jacket flow path through both connections | The jacket is routed with an inlet on one side of the body and an outlet on the opposite side, so the heating medium circulates around the body before leaving; jacket connections are installed on both body sides, and coupling size and connection form (threaded or flanged) must be specified at ordering. |
| jacket hydrostatic test and asme compliance | Fabricated jacket welds are executed to ASME B31.1/B31.3 practice with code-qualified welders, and after fabrication the jacket space is hydrostatically tested per ASME B31.1 while the process side is tested to API 598, a two-sided acceptance sequence worth requiring in purchase specifications. |
| jacketed design and flange standards | Triple-offset metal-seated butterfly valves of the type used for jacketed executions are designed to API 609, MSS SP-68 and EN 593; connecting flanges conform to ASME B16.5/B16.47, ISO 7005 or EN 1092, face-to-face to API 609/ISO 5752/EN 558, and testing to API 598 / ISO 5208. The jacket shell additionally follows piping practice (ASME B31.1/B31.3, B16.34). |
| face to face deviation for jacketed bodies | Face-to-face dimensions nominally follow ISO 5752 (and API 609/EN 558), but jacketed bodies frequently deviate from the standard table; suppliers state conformance as ISO 5752 or approved manufacturer drawing, so buyers must verify face-to-face against the jacketed drawing rather than the standard. |
| pressure class envelope of jacketed butterfly | Steam-traced jacketed high-performance butterfly executions are offered in ASME B16.34 pressure classes including Class 150 (with a derated 150DR variant), 300 and 600, in sizes from 6 to 48 inch, confirming that the jacket does not confine the product to a single class while pressure-temperature limits are taken from B16.34. |
| jba triple point heating | triple-point prevention of media solidification in the shaft and bearings, the valve body and the disc |
| jba steam through stem | steam flows directly through the stem, fully heating the bearing area |
| jba welded shaft disc interface | There is a welded interface between the shaft inlet and disc passage forming a single, integral unit, so there is no chance for steam to leak into the piping system. |
| jba disc perimeter steam path | channels the continuous steam flow from the top shaft, around the full perimeter of the disc, and out the bottom shaft |
| jba steam contact area advantage | 200% greater steam contact area |
| jba integral jacket installation | There is no chance for assembly errors in the field and there is no need for messy thermal contact cement. |
| jba design patents | Three specific U.S.A. patents have been issued based on this design (4559967, 4418889, and 4289296). |
| jba optional configurations | Optional bearing purge (steam or alternate media) Optional sealed bearings Optional double-packed stems with lantern rings Optional fire tested and high-temperature seat designs |
| jba three point system | a full 3-point valve heating system including the stem, body, and disc |
| jbb reduced port jacketed piping | Reduced Port Valves to match reducing flanges where jacketed piping systems are required. Valves can be steam jacketed and equipped with steam traced shafts, if required. |
| jbb sulphur pitch execution | Steam Jacketed Valves with steam traced shafts for molten sulphur and pitch applications |
| jbb ordering feature codes | J = Steam jacket, T = Steam-traced shaft |
| jbb jacketed when required by application | Steam jacketed and steam traced shafts when required by application. No elastomers or teflon. |
| jbc feasibility factors | A lug-style butterfly valve can use a steam jacket, but feasibility depends on body geometry, flange-bolt access, allowable thermal distortion, steam-side design conditions, and the actual location of the deposit. |
| jbc sticking location diagnosis | Identify where sticking begins: body cavity, disc edge, stem bearing, or packing area. |
| jbc thermal survey points | Take simultaneous temperature readings on the upstream pipe, downstream pipe, body near both flanges, body centerline, upper and lower body regions, stem-bearing area, and packing area. |
| jbc metal temperature basis | Compare that target with measured metal temperature rather than steam supply temperature. Steam can be hot while a blocked condensate path or poor thermal contact leaves the valve cold. |
| jbc short face to face conduction | Short face-to-face valves can receive substantial conductive heat from the upstream and downstream piping. That heat path may already keep the main body warm, while exposed lugs, the stem extension, packing, actuator bracket, and ambient airflow create localized losses. |
| jbc deposit localization rule | If the deposit is concentrated around the stem bearing or packing, a full body jacket may consume steam without heating the controlling cold spot. If deposits cover the disc and internal body surfaces, localized stem heating will not address the obstruction. |
| jbc condensate drainage | Route steam and condensate so condensate drains from the low point in every installed valve orientation. Trapped condensate reduces heat transfer and can impose mechanical loads during startup. |
| jbc access and spacer rule | Preserve access to every lug, flange bolt, packing adjustment, actuator fastener, and valve-removal path. The jacket must not become a structural spacer between the valve and mating flanges. |
| jbc thermal expansion effects | Excessive or uneven heating can change bearing clearance, seat contact, disc alignment, operating torque, and shutoff performance. Account for jacket mass, steam piping loads, insulation mass, and thermal movement. |
| jbc purpose designed jacket | A purpose-designed jacketed valve or manufacturer-approved removable jacket avoids uncontrolled alteration of the original body. |
| jbc least intrusive selection | Select the least intrusive method that holds every deposit-prone surface above the defined target. |
| jbd tail gas steam jacket | Tail Gas Butterfly Valves are equipped with steam jackets to prevent media from solidifying. |
Notas de alcance y fuentes
| jacketed flange oversize | Jacketed flange oversize: OEM pages state jacketed connecting flanges run one to two nominal sizes above the standard butterfly valve, while line-size full-jacket executions keep standard flanges via tapped bolt-hole inserts - coverage style determines whether flanges grow. |
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| standards layering | Standards layering: butterfly product standards (API 609, MSS SP-68, EN 593, ISO 5752/EN 558 face-to-face, API 598/ISO 5208 testing) and jacket-fabrication standards (ASME B16.10/B16.34, B31.1/B31.3 jacket hydro, API 598 process side) address different layers of the same jacketed valve; face-to-face is frequently "ISO 5752 or approved manufacturer drawing". |
Pedido y documentación
Documentos
Solicite con la consulta el conjunto documental que necesite — los elementos habituales para esta ejecución (certificados de material, informes de ensayo según la norma de inspección indicada, planos dimensionales) se confirman y entregan con la cotización.
Cotización
Una consulta lista para cotizar indica: medida nominal y clase de presión, preferencia de materiales del cuerpo y del asiento, conexión terminal, accionamiento, y el fluido de servicio con su temperatura. Los valores típicos de esta página son rangos de referencia; los valores vinculantes se confirman en la cotización.
Muestra y suministro
Las condiciones de suministro, cantidades pedidas y plazos se acuerdan por pedido — indique el país de destino y el calendario requerido con la consulta.
Almacenamiento y envío
Almacene las válvulas con asientos y sellos protegidos de UV, ozono y deformación, mantenga los protectores de cara terminal hasta la instalación y, en ejecuciones con asiento de elastómero o PTFE, evite el almacenamiento prolongado a la intemperie — los compuestos de asiento envejecen más rápido al sol directo y en condiciones de congelación.
Preguntas frecuentes
¿Qué debe incluir una solicitud de cotización para válvulas de mariposa con camisa?
La norma y clase aplicables, el tamaño nominal, los materiales de cuerpo y asiento, el medio de servicio con su temperatura y el destino — lo que falte se confirma durante la cotización.
¿Qué tamaño y clase de presión están disponibles en válvulas de mariposa con camisa?
Un rango verificado de tamaño y clase de presión para esta válvula aún no está publicado en esta página — el tamaño y clase de presión aplicable a su servicio se propone y confirma durante la cotización. Envíe las condiciones de servicio con la solicitud y la selección se indica en la oferta.
¿Qué material del cuerpo están disponibles en válvulas de mariposa con camisa?
Un rango verificado de material del cuerpo para esta válvula aún no está publicado en esta página — el material del cuerpo aplicable a su servicio se propone y confirma durante la cotización. Envíe las condiciones de servicio con la solicitud y la selección se indica en la oferta.
Conocimiento: guías de selección
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