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VENTOSAS Manual Técnico
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MANUAL TÉCNICO DE VÁLVULAS VENTOSA
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DEPARTAMENTO TÉCNICO COMERCIAL
MANUAL TÉCNICO DE VÁLVULAS V ENTO SA
DTC- MVV MV V 2/91
Índice
.
1.- Introducción
4
2. Causas de la existencia de aire en las redes r edes hidráulicas
5
2.1. Causas propias del fluido 2.2. Causas propias del sistema 3. Comportamiento del aire acumulado
8
3.1. Flujo de aire dentro de las conducciones 3.2. Factores que influyen en el flujo de aire en las conducciones 3.3. Localización de aire acumulado 4. Ventajas de la existencia de aire de forma controlada en las redes hidráulicas
11
4.1. Reducción de la intensidad del golpe de ariete 4.2. Prevención del colapso de la tubería 4.3. Evitar la succión de suciedad a través de los emisores 5. Problemas derivados de la existencia de aire en las redes hidráulicas
12
5.1. Problemas destructivos 5.2. Problemas de funcionamiento 5.3. Soluciones a los problemas de funcionamiento 6. Sistemas de control de aire en las redes hidráulicas
18
6.1. Válvulas ventosa de efecto automático 6.2. Válvulas ventosa de efecto cinético 6.3. Válvulas ventosa de doble efecto 7. Dimensionado del orificio de las válvulas ventosa 7.1. Válvulas ventosa de efecto automático 7.2. Válvulas ventosa de efecto cinético
21
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DEPARTAMENTO TÉCNICO COMERCIAL
MANUAL TÉCNICO DE VÁLVULAS V ENTO SA
8. Localización óptima de las válvulas ventosa
DTC- MVV MV V 3/91
26
8.1. Válvulas ventosa de efecto automático 8.2. Válvulas ventosa de efecto cinético 8.3. Válvulas ventosa de doble efecto o trifuncionales 8.4. Resumen de recomendaciones de localización de las válvulas ventosa 9. Instalación y mantenimiento
31
9.1. Instalación 9.2. Mantenimiento 9.3. Coste relativo 10. A.R.I. PLAN: programa informático de dimensionado y localización de las válvulas ventosa.
32
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DEPARTAMENTO TÉCNICO COMERCIAL
MANUAL TÉCNICO DE VÁLVULAS V ENTO SA
DTC- MVV MV V 4/91
1. INTRODUCCIÓN En ocasiones en una instalación o red hidráulica nos encontramos con una serie de problemas tales como roturas repetitivas de tuberías, consumo excesivo de los grupos de bombeo, caudales anormalmente bajos, funcionamiento en general variable, desgaste y cavitación destructiva de los materiales, etc., a los cuales no podemos dar una explicación lógica y razonable. En la mayoría de los casos dichos problemas proceden de haber olvidado en parte o totalmente un factor importante y decisivo en el transporte real de fluidos a través de redes hidráulicas, y al que en muchas ocasiones no se le presta la debida atención. A El este fenómeno se le prestaría mayor atención si se recordase la siguiente frase: "El agua no viaja sola a través de las tuberías ". ". Efectivamente, dentro de una red hidráulica, además del agua nos podemos encontrar aire formando bolsas o burbujas, y su presencia puede afectar de forma importante el comportamiento de la instalación, pudiendo ser la causa de los problemas de funcionamiento funcionamiento descritos anteriormente. Del mismo modo, es conveniente permitir la entrada de aire en la instalación cuando esta se descarga, para evitar daños producidos en las conducciones por presiones negativas y evitar la succión de suciedad a través de los emisores de agua. Es especialmente importante evitar el efecto de succión en los sistemas de riego por goteo, al ser estos especialmente susceptibles a la obturación. La importancia de la presencia de aire en las conducciones y las posibilidades de su control queda reflejada en los diferentes puntos de este manual. Para evitar estos trastornos debidos a la existencia de aire en las tuberías en carga y al efecto de vacío o rotura de la columna de agua, es necesario disponer en ellas de sistemas capaces de eliminarlo y controlarlo adecuadamente. Dichos sistemas o dispositivos son las denominadas Válvulas Ventosa, que permiten evacuar el aire evitando la pérdida de agua de la red presurizada a la vez que permiten la entrada cuando la red se despresuriza. Dichas válvulas deberían estar bien presentes en las mentes del técnico que diseña o el instalador que monta la red hidráulica, prestando especial atención tanto a su elección, como a su localización e instalación. En definitiva, el buen uso de las válvulas ventosa no supone un coste adicional relevante a la vez que reporta beneficios cuantificables en rentabilidad. • • • • • •
Evita oscilaciones de presión y el funcionamiento anómalo de la instalación. Protege la instalación de roturas por depresión o sobrepresión. Protege toda la instalación del desgaste ya que evita el fenómeno de cavitación. Evita la disminución del rendimiento de la impulsión. Ayuda a evitar errores en la medida del caudal. En instalaciones de riego por goteo reduce al máximo la formación de vacío y por tanto evita la succión de impurezas que pueden obturar el gotero.
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DEPARTAMENTO TÉCNICO COMERCIAL
MANUAL TÉCNICO DE VÁLVULAS V ENTO SA
DTC- MVV MV V 5/91
2. CAUSAS DE LA EXISTENCIA DE AIRE EN LAS REDES HIDRÁULICAS Seguidamente se relacionan las diferentes causas de la existencia de aire en el interior de las redes hidráulicas. 2.1. CAUSAS PROPIAS DEL FLUIDO 2.1.1. Liberación del aire disuelto en el agua El contenido de aire disuelto en el agua depende de diferentes factores tales como la presión y la temperatura. A mayor presión, el contenido de aire disuelto en el agua es mayor. Por el contrario, a mayor temperatura, el contenido de aire disuelto disminuye. En tuberías expuestas al sol o tuberías enterradas que puedan tener un efecto de calentamiento, la temperatura del agua aumenta, produciéndose esta liberación del aire disuelto. Los cambios en la pendiente de una tubería producen cambios de presión dentro de la misma. En los puntos elevados de la conducción, la presión disminuye, liberándose el aire disuelto y formándose bolsas de aire. La cantidad máxima de aire disuelto a presión atmosférica, m3 aire / m3 agua, es el denominado Coeficiente Coeficiente de Bunsen ( CB ), dado en la siguiente tabla. T ºC CB
0 0.0286
5 0.0252
10 0.0224
15 0.0201
20 0.0183
25 0.0167
30 0.0154
Esto es proporcional a la presión, así CB a 2 atm y 10 ºC es 0.0448, el doble que a presión atmosférica (tabla). En la siguiente gráfica se representa el volumen de aire en cm3 en condiciones normales que está disuelto en un litro de agua en función de la temperatura y la presión absoluta.
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DEPARTAMENTO TÉCNICO COMERCIAL
MANUAL TÉCNICO DE VÁLVULAS V ENTO SA
DTC- MVV MV V 6/91
A una temperatura de 20 °C y presión atmosférica de 1 atm., el contenido de aire disuelto en el agua es de 20 l/m3 (20 litros de aire en cada metro cúbico de agua). Un aumento de la temperatura o una reducción de la presión dentro de la tubería producen su liberación, formando burbujas o bolsas de aire. En una tubería con un caudal de agua de 100 m3 /h a presión constante de 1 atm., un cambio de temperatura de 15 °C a 38 °C producirá 0.5 m3 /h de aire en forma de burbujas que se mezclará con el aire libre existente, quedando atrapado en la tubería. 2.2. CAUSAS PROPIAS DEL SISTEMA 2.2.1. Entrada de aire del exterior • Cuando el agua fluye desde lugares abiertos a la atmósfera hacia el interior de una
tubería, se aspira, junto con ella, una gran cantidad de aire en forma de pequeñas burbujas. Este efecto se incrementa si existe una gran turbulencia en la entrada, produciéndose una mezcla del aire con el agua.
• Cuando el agua fluye por una tubería parcialmente llena y pasa a otra completamente
llena, se forma un gradiente hidráulico que puede producir la aspiración de aire. aire. (Fig.2)
Fig. 2 • La aspiración de aire puede ocurrir a través de accesorios defectuosos, orificios o
válvulas de estrangulación, si se producen condiciones de depresión dentro de la
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DEPARTAMENTO TÉCNICO COMERCIAL
MANUAL TÉCNICO DE VÁLVULAS V ENTO SA
DTC- MVV MV V 7/91
2.2.3. Descarga incompleta de aire durante el llenado de la tubería El aire atrapado en la tubería cuando la instalación está parada no es completamente expulsado durante el llenado de la misma. Este aire irá desplazándose por la conducción por el efecto de llenado de las zonas parcialmente vacías hasta quedar atrapado en los puntos elevados o críticos.
2.2.4. Entrada controlada de aire para evitar presiones negativas Para evitar la depresión que se genera en el proceso de vaciado de la tubería, y que puede producir el colapso de la misma, se recomienda permitir la entrada de aire de forma controlada al interior de la conducción.
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DEPARTAMENTO TÉCNICO COMERCIAL
MANUAL TÉCNICO DE VÁLVULAS V ENTO SA
DTC- MVV MV V 8/91
3. COMPORTAMIENTO DEL AIRE ACUMULADO En los siguientes puntos se describen algunas de las características características del comportamiento del aire acumulado en el interior de las tuberías. 3.1. FLUJO DE AIRE DENTRO DE LAS CONDUCCIONES El flujo de aire dentro de las conducciones se produce y se comporta de diferentes formas. • Pequeñas cantidades de aire formando burbujas (más grandes o más pequeñas) que
se distribuyen a lo largo de toda la sección de la tubería (Fig.3)
Fig. 3
• Grandes cantidades de aire formando bolsas que se acumulan y se desplazan por la
superficie interior superior de la tubería (Fig.4)
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DTC- MVV MV V 9/91
En condiciones extremas, el aire puede llegar a ocupar totalmente la sección de la tubería, moviéndose en forma de grandes burbujas intermitentes en el agua (Fig.5).
•
Fig. 5
3.2. FACTORES QUE INFLUYEN EN EL FLUJO DE AIRE EN LAS CONDUCCIONES La cantidad del flujo de aire y su estabilización dentro de la tubería depende de varios factores. Uno de estos factores es la rugosidad de la superficie interna de la tubería. La fricción se produce entre las burbujas de aire y dicha superficie. Una rugosidad extrema puede producir que el flujo de aire se detenga incluso con una alta velocidad de circulación del agua. Otros factores que influyen en la estabilización o no de bolsas de aire dentro de la tubería son la velocidad del agua, el diámetro de la tubería, la pendiente, etc. 3.2.1. Velocidad Crítica Crítica para el transporte de bolsas de aire La velocidad crítica nos determina la velocidad del flujo del agua a partir de la cual son arrastradas las bolsas de aire acumulado. Para el cálculo de dicha velocidad se puede utilizar la siguiente fórmula:
(
)
Vc = 0.25 * Senθ + 0.4 * gD
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3.3. LOCALIZACIÓN DEL AIRE ACUMULADO En condiciones estáticas, sin ningún flujo de agua, el aire se acumula en el punto más elevado de la conducción (Fig.6).
Fig. 6
En condiciones dinámicas, cuando el agua está circulando por la tubería, el aire es empujado hacia abajo de la conducción. El aire se acumulará a lo largo de los salientes de la tubería, derivaciones, accesorios, contadores, válvulas y codos (Fig.7).
Fig. 7
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4. VENTAJAS DE LA EXISTENCIA DE AIRE DE FORMA CONTROLADA EN LAS REDES HIDRÁULICAS
4.1. REDUCCIÓN DE LA INTENSIDAD DEL GOLPE DE ARIETE La existencia de bolsas de aire controladas reduce la intensidad del golpe de ariete, ya que actúan como un resorte o amortiguador que absorbe parte de su energía. Estas características vienen dadas por la compresibilidad de los gases. Por otra parte , al dejar libre la entrada de aire a presiones nulas o negativas, se reduce la intensidad de la onda negativa o de retorno del golpe de Ariete.
4.2. PREVENCIÓN DEL COLAPSO DE LA TUBERÍA Al drenar una tubería, es necesario permitir la entrada de aire al sistema para llenar el vacío que deja el agua al salir. Por el contrario, en situaciones extremas, se puede generar una depresión que produzca el colapso de la tubería. Es de gran importancia en redes de pendiente ascendente. 4.3. EVITAR LA SUCCIÓN DE SUCIEDAD A TRAVÉS DE LOS EMISORES
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5. PROBLEMAS DERIVADOS DE LA EXISTENCIA DE AIRE EN LAS REDES HIDRÁULICAS Los problemas que se pueden producir a raíz de la existencia de bolsas de aire dentro de la tubería pueden clasificarse en destructivos y de funcionamiento. 5.1. PROBLEMAS DESTRUCTIVOS 5.1.1. Colapso de la tubería Si se produce un vaciado rápido de una tubería, ya sea de forma intencionada o accidentalmente, accidentalmente, en la parte alta de la misma se produce un vacío (presión menor que la atmosférica) que puede dañar la estructura física del tubo, pudiendo producir incluso la rotura del tubo por colapso. La depresión puede producirse por diversos motivos : a)
Por cierre de una válvula instalada a la salida de un depósito.
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a)
MANUAL TÉCNICO DE VÁLVULAS V ENTO SA
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Si se se vierte a través de una salida libre, el aire entrará por el extremo evitando la depresión.
Fig. 10 b)
Si el extremo de la tubería queda situado situado por debajo del nivel de agua de un depósito, no se permite la entrada de aire y se produce la depresión interior.
Fig. 11
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Este fenómeno deberá tenerse especialmente en cuenta en tuberías de paredes delgadas (PN≤4 atm.). Ejemplo:
Material: Diámetro: Espesor:
PVC 110 mm. 2,2 mm. (PN4) 2, 2 ∆ p = 4,8 × 10 4× [110 ] = 0,38 Kg / cm 2 3
5.1.2. Cavitación En puntos donde existe una disminución brusca de presión se produce la formación de burbujas de aire. Cuando las condiciones de flujo vuelven a ser las normales, las burbujas se colapsan, liberando grandes cantidades de energía y produciendo una erosión importante. Este fenómeno se puede dar en válvulas, hidrantes hidrantes y reguladores de presión. 5.1.3. Vibraciones de la tubería Ciertas condiciones de flujo hacen que las bolsas de aire se desplacen por la tubería. Estos movimientos empujan grandes cantidades de agua, generando cambios bruscos de la velocidad del fluido. Las sobrepresiones locales que se producen dan como
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En caso de rotura de tubería con descarga de presión de 15 atm. en un segundo, se liberaría respectivamente una energía equivalente a 0.65 HP (agua) y a 940 HP (aire). Esta liberación de energía puede deteriorar los accesorios de la instalación y lo más importante, representa un riesgo físico para las personas. Debido a su compresibilidad, una bolsa de aire encerrada en la tubería puede producir elevadas sobrepresiones puntuales durante el arranque y paro de la instalación. La magnitud de tales sobrepresiones puede sobrepasar la presión máxima de resistencia de la tubería, produciéndose la rotura de la misma. La sobrepresión generada depende de factores tales como : • • • • •
El diámetro de la tubería. La velocidad de circulación del agua. El volumen del aire acumulado. La distancia de situación de la bolsa de aire. La presión estática de la bolsa de aire.
y puede expresarse mediante la siguiente fórmula : P' = P × e
K
K =
D 2 ⋅ v 2 ⋅ π ⋅ L ⋅ 1,25 ⋅ 10 −3 P ⋅ V
donde : P'(Kg/cm2) = presión máxima alcanzada. P (Kg/cm 2) presión estática la bolsa de aire.
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5.1.6. Desgaste de las partes móviles de los accesorios Algunos instrumentos de medida poseen partes móviles que pueden girar a altas velocidades, es el caso de contadores e hidrantes. El agua actúa sobre estos mecanismos tanto como lubricante como refrigerante. Cuando el aire se introduce en dichos instrumentos de medida, estos efectos de lubricación y refrigeración del agua se ven fuertemente reducidos. La velocidad de las partes móviles es significativamente superior en condiciones de flujo de aire, produciéndose, por lo tanto, un desgaste prematuro al poco tiempo de uso que afecta la exactitud de los medidores.
5.2. PROBLEMAS DE FUNCIONAMIENTO
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5.2.2. Reducción de la eficacia de las estaciones de bombeo La existencia de aire en la aspiración de agua del sistema reduce significativamente la eficacia de los grupos de bombeo. Debido a un incremento del consumo de energía o a una reducción del caudal nominal de la instalación, se pueden producir deficiencias importantes en el funcionamiento normal de la bomba. Es posible expresar la disminución de la eficacia de la bomba en función del volumen de aire aspirado en la entrada. La aspiración de aire a través de la aspiración de la bomba (vórtice, juntas defectuosas, prensaestopas, ...) de forma prolongada puede llevar a la destrucción o corrosión del rodete. 5.2.3. Errores en la medida del caudal
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6. SISTEMAS HIDRÁULICAS
DE
MANUAL TÉCNICO DE VÁLVULAS V ENTO SA
CONTROL
DEL
AIRE
EN
LAS
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REDES
Las válvulas ventosa son los dispositivos básicos para realizar el control de la presencia de aire en las conducciones. Existen dos tipos de válvulas que realizan dicha función: las de efecto automático o de funcionamiento a alta presión y las de efecto cinético o de funcionamiento a baja presión. Según esta tipología, las válvulas ventosa pueden clasificarse en: § § §
Válvulas ventosa de efecto automático. Válvulas ventosa de efecto cinético. Válvulas ventosa ventosa de doble efecto o trifuncionales.
6.1. VÁLVULAS VENTOSA DE EFECTO AUTOMÁTICO Las válvulas ventosa de efecto automático o de alta presión son sistemas hidromecánicos que evacuan, de forma automática, pequeñas bolsas de aire que se
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DEPARTAMENTO TÉCNICO COMERCIAL
MANUAL TÉCNICO DE VÁLVULAS V ENTO SA
DTC- MVV MV V 19/ 19/ 91
6.2. VÁLVULAS VENTOSA DE EFECTO CINÉTICO Los procesos de llenado y vaciado de tuberías son dos de las operaciones más críticas en toda instalación. Durante el proceso de llenado, el aire que ocupa las tuberías debe ser evacuado a medida que el agua va entrando. Esto debe hacerse controlada y eficazmente para evitar sobrepresiones y golpes de ariete, de forma que el agua pueda llenar completamente la conducción sin dejar aire atrapado. Durante el proceso de vaciado de tubería se debe permitir la entrada de aire para llenar el vacío dejado por el agua y evitar la formación de depresiones que podrían producir el colapso de la tubería. La entrada de aire es esencial para poder drenar la tubería de forma efectiva y evitar la separación de la columna líquida, la cual puede ser tan dañina como la sobrepresión. Estas funciones se realizan con las llamadas válvulas ventosa de efecto cinético o de
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DTC- MVV MV V 20/ 20/ 91
6.3. VÁLVULAS VENTOSA DE DOBLE EFECTO O TRIFUNCIONALES Existen en el mercado válvulas ventosa que combinan los dos efectos, denominándose válvulas ventosa de doble efecto, trifuncionales o de doble orificio. Las válvulas ventosa de doble efecto combinan las funciones de las de efecto automático automático y las de efecto cinético. Las válvulas de efecto automático permiten evacuar pequeñas cantidades de aire de la tubería cuando el sistema está presurizado. Sin embargo, su orificio es normalmente muy pequeño y no admite la entrada o salida de la suficiente cantidad de aire para evitar la sobrepresión en el llenado o la depresión en el vaciado de la conducción. Por otro lado, las válvulas de efecto cinético poseen grandes orificios para poder evacuar grandes cantidades de aire en el llenado y admitir grandes volúmenes en el vaciado de la tubería. Sin embargo, estas válvulas no pueden evacuar las pequeñas burbujas de aire cuando el sistema está operando normalmente, es decir, presurizado. Por lo tanto, ni las válvulas de efecto automático ni las de efecto cinético pueden pueden cumpli
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DTC- MVV MV V 21/ 21/ 91
7. DIMENSIONADO DEL ORIFICIO DE LAS VÁLVULAS VENTOSA VENTOS A 7.1. VÁLVULAS VENTOSA DE EFECTO AUTOMÁTICO Las válvulas de efecto automático se utilizarán únicamente para evacuar pequeñas cantidades de aire de la tubería, producidas principalmente por causas propias del
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Ejemplo: Diámetro orificio: 48 mm. → Ao=1,81 X 10-3 m2 →∆P=3 m.c.a. Presión diferencial:
3
2 × 3
0,5 4
3
DTC- MVV MV V 22/ 22/ 91
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instalación. Se acostumbra a tomar valores entre 0,75 y 1 de la presión nominal del sistema. Esta sobrepresión del golpe de ariete se genera cuando la columna de agua de la tubería llega a la válvula ventosa y se produce el cierre de la misma. Basándonos en consideraciones de golpe de ariete, el caudal máximo puede calcularse por la fórmula de Allievi o Joukovsky :
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7.2.2. Vaciado de tuberías En el vaciado de tuberías, el aire debe ser aspirado de la atmósfera. El dimensionado debe realizarse de tal forma que el orificio permita la entrada suficiente de aire para que no se produzca una depresión muy importante en el interior de la tubería, lo cual podría ocasionar el colapso de la misma.
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DTC- MVV MV V 25/ 25/ 91
7.2.3. Proceso de selección 1) Determinar el tamaño de de la válvula válvula ventosa independientemente independientemente para para cada punto de la tubería. 2) Determinar el caudal de aire máximo tanto para el llenado como para el vaciado de la tubería.
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DEPARTAMENTO TÉCNICO COMERCIAL
MANUAL TÉCNICO DE VÁLVULAS V ENTO SA
DTC- MVV MV V
VÁLVULA VENTOSA BARAK, MODELOS MODELOS D D-040-P -040-P D-040-B La válvula Barak es una válvula ventosa de doble efecto cuyo diseño dinámico permite la descarga de aire a alta velocidad a la vez que es capaz de eliminar el aire de las tuberías con flujo de agua bajo presión. Su diseño, patentado por A.R.I , se basa en una goma desplegable de sellado que asegura el cierre hermético. El cuerpo de plástico plástico robusto y todas las piezas operativas han sido fabricadas con materiales especialmente elegidos por su resistencia a la corrosión.
Los modelos disponible son: MODELO D-040-P D-040-B
DESCRIPCIÓN Barak base de plástico Barak base de Bronce
PRESIÓN PRESI ÓN PN-16 PN-16
TAMAÑOS DISPONIBLES 2” RM 2” RM
Características principales • • • • • • • • • •
Presión de trabajo: de 0.2-16 bar (3-230 psi) Trabaja a una presión diferencial de 0.8 bars, evitando el cerrado prematuro. Unión de rosca BSPT/NPT De peso liviano, pequeñas dimensiones y estructura simple y confiable. Cuerpo estandar de plástico robusto resistente a la corrosión. La salida de drenaje permite eliminar los fluidos innecesarios. Mecanismo de autolimpieza Totalmente hermética y no gotea a bajas presiones. Purga grandes volúmenes de aire hasta 160 m3 /h Reduce en gran medida la obturación debido a materias foráneas.
61/ 61/ 91
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DEPARTAMENTO TÉCNICO COMERCIAL
MANUAL TÉCNICO DE VÁLVULAS V ENTO SA
Especificación de componentes Núm 1 2 3 4 5
Nombre Cuerpo Codo de drenaje Junta completa Guía Guía Flotador
6 7
Junta tórica Base
Materiales Materi ales Nylon reforzado Polipropileno Nylon reforzado Polipropileno expandido BUNA-N BUNA -N Nylon reforzado o Latón ASTM B124
Dimensiones y peso Barak 2” Dimensión A (mm) Dimensión B (mm) Conexión de escape Peso (Kg) Orificio de salida (mm2) Automático Orificio de salida (mm2) Dinámico Capacidad de entrada y salida de aire
D-040-P 180 209 1 ½" BSP 1.1 12 804
D-040-B 180 209 1 ½" BSP 2.2 12 804
DTC- MVV MV V 62/ 62/ 91
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DEPARTAMENTO TÉCNICO COMERCIAL
MANUAL TÉCNICO DE VÁLVULAS V ENTO SA
DTC- MVV MV V
VÁLVULA VENTOSA MINIBARAK, MODELOS D-040-P D- 040-P D-040-B La válvula Minibarak es una válvula ventosa de doble efecto cuyo diseño dinámico permite la descarga de aire a alta velocidad a la vez que es capaz de eliminar el aire de las tuberías con flujo de agua bajo presión. Su diseño, patentado por A.R.I , se basa en una goma desplegable de sellado que asegura el cierre hermético. El cuerpo de plástico robusto robusto y todas las piezas operativas operativas han sido fabricadas fabricadas con materiales materiales especialmente especialmente elegidos por su resistencia a la corrosión.
Los modelos disponible son: MODELO D-040-P D-040-B
DESCRIPCIÓN Barak base de plástico Barak base de Bronce
PRESIÓN PRESI ÓN PN-10 PN-10
TAMAÑOS DISPONIBLES 3/4” y 1” RM 3/4” y 1” RM
Características principales • • • • • • • • • •
Presión de trabajo: de 0.2-10 bar (3-150 psi) Trabaja a una presión diferencial de 0.8 bars, evitando el cerrado prematuro. Unión de rosca BSPT/NPT De peso liviano, pequeñas dimensiones y estructura simple y confiable. Cuerpo estandar de plástico robusto resistente a la corrosión. La salida de drenaje permite eliminar los fluidos innecesarios. Mecanismo de autolimpieza Totalmente hermética y no gotea a bajas presiones. Purga grandes volúmenes de aire hasta 140 m3 /h Reduce en gran medida la obturación debido a materias foráneas.
63/ 63/ 91
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DEPARTAMENTO TÉCNICO COMERCIAL
MANUAL TÉCNICO DE VÁLVULAS V ENTO SA
Especificación de componentes
Núm 1 2 3 4 5
Nombre Cuerpo Codo de drenaje Junta completa Guía Guía Flotador
6 7
Junta tórica Base
Materiales Materi ales Nylon reforzado Polipropileno Nylon reforzado Polipropileno expandido BUNA-N BUNA -N Nylon reforzado o Latón ASTM B124
Dimensiones y peso Minibarak ¾” y 1” Dimensión A (mm) Dimensión B (mm) Conexión de escape Peso (Kg) Orificio de salida (mm2) Automático Orificio de salida (mm2) Dinámico Capacidad de entrada y salida de aire
D-040-P
D-040-B
100 140 3/8” BSP 0.33 7.8 100
100 140 3/8” BSP 0.7 7.8 100
DTC- MVV MV V 64/ 64/ 91
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DEPARTAMENTO TÉCNICO COMERCIAL
MANUAL TÉCNICO DE VÁLVULAS V ENTO SA
DTC- MVV MV V 65/ 65/ 91
VÁLVULA VENTOSA BARAK METÁLICA, MODELO D-040-C La ventosa D-040-C de doble efecto cuyo diseño dinámico permite la descarga de aire a alta velocidad a la vez que es capaz de eliminar el aire de las tuberías con flujo de agua bajo presión. Su diseño, patentado por A.R.I , se basa en una goma desplegable de sellado que asegura el cierre hermético. El cuerpo es de fundición metálica como protección de actos vandálicos y todas las piezas operativas han sido fabricadas con materiales materiales especialmente especialmente elegidos por su resistencia a la corrosión.
Los modelos disponible son: MODELO D-040-C
DESCRIPCIÓN PRESIÓN PRESI ÓN Barak de fundición metálica PN-16
TAMAÑOS DISPONIBLES 2” RM
Características principales • • • • • • • • • •
Presión de trabajo: de 0.2-16 bar (3-230 psi) Trabaja a una presión diferencial de 0.8 bars, evitando el cerrado prematuro. Unión de rosca BSPT/NPT De peso liviano, pequeñas dimensiones y estructura simple y confiable. Cuerpo estandar de plástico robusto resistente a la corrosión. La salida de drenaje permite eliminar los fluidos innecesarios. Mecanismo de autolimpieza Totalmente hermética y no gotea a bajas presiones. Purga grandes volúmenes de aire hasta 160 m3 /h Reduce en gran medida la obturación debido a materias foráneas.
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DEPARTAMENTO TÉCNICO COMERCIAL
MANUAL TÉCNICO DE VÁLVULAS V ENTO SA
Especificación de componentes Núm 1 2 3 4 5
Nombre Cuerpo Codo de drenaje Junta completa Guía Guía Flotador
6 7
Junta tórica Base
Materiales Materi ales Nylon reforzado Polipropileno Nylon reforzado Polipropileno expandido BUNA-N BUNA -N Nylon reforzado o Latón ASTM B124
Dimensiones y peso Barak 2”
D-040-P
Dimensión A (mm) Dimensión B (mm) Conexión de escape Peso (Kg) Orificio de salida (mm2) Automático Automáti co Orificio de salida (mm2) Dinámico
202.5 230.6 1 ½" BSP 5.4 12 804
Capacidad de entrada y salida de aire
DTC- MVV MV V 66/ 66/ 91
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DEPARTAMENTO TÉCNICO COMERCIAL
MANUAL TÉCNICO DE VÁLVULAS V ENTO SA
DTC- MVV MV V 67/ 67/ 91
VÁLVULA VENTOSA SHELEF, MODELO D-050 La válvula Shelef es una válvula ventosa de doble efecto cuyo diseño dinámico permite la descarga de aire a alta velocidad a la vez que es capaz de eliminar el aire de las tuberías con flujo de agua bajo presión. Esta válvula es la combinación de la válvula de efecto automático S050-B y la válvula de efecto cinético K-010.
Los modelos disponibles son: MODELO D-050
DESCRIPCIÓN PRESIÓN PRESI ÓN Combinación S-050-B + K-010 PN-16
TAMAÑOS DISPONIBLES 2” RM, 2” 3” 4” 6” 8” B
Características principales • • • • • • • •
Presión de trabajo: de 0.2-16 bar (3-230 psi) Trabaja a una presión diferencial de 0.8 bars, evitando el cerrado prematuro. Cuerpo estandar de plástico robusto resistente a la corrosión. La salida de drenaje permite eliminar los fluidos innecesarios. Mecanismo de autolimpieza Totalmente hermética y no gotea a bajas presiones. Purga grandes volúmenes de aire hasta 160 m3 /h Reduce en gran medida la obturación debido a materias foráneas.
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DEPARTAMENTO TÉCNICO COMERCIAL
MANUAL TÉCNICO DE VÁLVULAS V ENTO SA
Especificación de componentes
Núm 1 2 3 4 5 6 7
Nombre Cuerpo Tira de goma replegable Guia Flotador Base Ba se Junta tórica tóric a Tapa
Materiales Materi ales Nylon reforzado Goma E.P.D.M Nylon reforzado Polipropileno Polipropileno expandido Latón ASTM B124 BUNA-N BUN A-N PN 16 Fundición hierro ASTM A-48 CL. 35B
DTC- MVV MV V 68/ 68/ 91
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DEPARTAMENTO TÉCNICO COMERCIAL
MANUAL TÉCNICO DE VÁLVULAS V ENTO SA
DTC- MVV MV V 69/ 69/ 91
Dimensiones y peso 2” rosca 2” brida 3” 4” 167 167 286 342 330 335 356 368 9.4 12.0 18.4 26.4 2 (mm ) 12 12 12 12
Dimensión A (mm) Dimensión B (mm) Peso (Kg) Orificio de salida Automático Orificio de salida (mm2) Cinético Cinétic o Conexión de escape interno (mm2) Conexión de escape externo (mm2)
794 Rosca -
6” 553 550 77.6 12
8” 553 553 85.6 12
794 1809 3317 17662 17662 1.5 BSP 63.5 80.0 124.0 124.0 74.6 96.0 140.0 140.0
Capacidad de entrada y salida de aire Capacidad de salida de aire, ventosa automática
Capacidad de entrada y salida de aire, ventosa cinética
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DEPARTAMENTO TÉCNICO COMERCIAL
MANUAL TÉCNICO DE VÁLVULAS V ENTO SA
DTC- MVV MV V 70/ 70/ 91
VÁLVULA VENTOSA MODELO D-050-C D- 050-C La válvula D-050-C es una válvula vál vula ventosa ven tosa de de doble efecto cuyo diseño dinámico permite la descarga de aire a alta velocidad a la vez que es capaz de eliminar el aire de las tuberías con flujo de agua bajo presión. Esta válvula es la combinación de la válvula de efecto automático S-050-C y la válvula de efecto cinético K-010. K- 010. Su estructura metálica asegura la protección al vandalismo.
Los modelos disponibles son: MODELO DESCRIPCIÓN PRESIÓN PRESI ÓN D-050-C Combinación S-050-C + K-010 PN-16
TAMAÑOS DISPONIBLES 2” 3” 4” 6” B
Características principales • • • • • • •
Presión de trabajo: de 0.2-16 bar (3-230 psi) Trabaja a una presión diferencial de 0.8 bars, evitando el cerrado prematuro. Cuerpo estándar de fundición metálica recubierto con poliéster curado al horno resistente a la corrosión. La salida de drenaje permite eliminar los fluidos innecesarios. Mecanismo de autolimpieza Totalmente hermética y no gotea a bajas presiones. Purga grandes volúmenes de aire hasta 160 m3 /h Reduce en gran medida la obturación debido a materias foráneas.
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DEPARTAMENTO TÉCNICO COMERCIAL
MANUAL TÉCNICO DE VÁLVULAS V ENTO SA
Especificación de componentes
DTC- MVV MV V 71/ 71/ 91
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DEPARTAMENTO TÉCNICO COMERCIAL
MANUAL TÉCNICO DE VÁLVULAS V ENTO SA
DTC- MVV MV V 72/ 72/ 91
Dimensiones y peso
Dimensión A (mm) Dimensión B (mm) Peso (Kg) Orificio de salida (mm2) Automático Orificio de salida (mm2) Cinético Cinétic o Conexión de escape Interno (mm2) Conexión de escape Externo (mm2)
2” rosca 2” brida 173 173 340 346 10.0 13.0 12 12 794 794 Rosca 1.5 BSP -
-
3” 286 368 19.3 12 1809 63.5
4” 6” 8” 342 553 553 393 557 564 27.4 79.0 87.0 12 12 12 3317 17662 17662 80.0 124.0 124.0
74.6 96.0 140.0
Capacidad de entrada y salida de aire Capacidad de salida de aire, ventosa automática
140
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DEPARTAMENTO TÉCNICO COMERCIAL
MANUAL TÉCNICO DE VÁLVULAS V ENTO SA
DTC- MVV MV V 73/ 73/ 91
VÁLVULA VENTOSA MODELO D-052 D- 052 La válvula D-052 es una válvula ventosa de doble efecto cuyo diseño dinámico permite la descarga de aire a alta velocidad a la vez que es capaz de eliminar el aire de las tuberías con flujo de agua bajo presión. Esta válvula es la combinación de la válvula de efecto automático S-052 y la válvula de efecto cinético K-012. Su estructura metálica asegura la protección al vandalismo.
Los modelos disponibles son: MODELO D-052
DESCRIPCIÓN Combinación S-052 + K-012
PRESIÓN PRESI ÓN PN-25
TAMAÑOS DISPONIBLES 2” RM, 2” 3” 4” 6” 8” B
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DEPARTAMENTO TÉCNICO COMERCIAL
MANUAL TÉCNICO DE VÁLVULAS V ENTO SA
Especificación de componentes
DTC- MVV MV V 74/ 74/ 91
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DEPARTAMENTO TÉCNICO COMERCIAL
MANUAL TÉCNICO DE VÁLVULAS V ENTO SA
DTC- MVV MV V 75/ 75/ 91
Dimensiones y peso 2” rosca 2” brida 3” 4” 173 173 286 342 340 346 368 393 10.0 13.0 19.3 27.4 2 (mm ) 12 12 12 12
Dimensión A (mm) Dimensión B (mm) Peso (Kg) Orificio de salida Automático Orificio de salida (mm2) Cinético Cinétic o Conexión de escape Interno (mm2) Conexión de escape Externo (mm2)
794 Rosca -
6” 553 557 79.0 12
8” 553 564 87.0 12
794 1809 3317 17662 17662 1.5 BSP 63.5 80.0 124.0 124 -
74.6 96.0 140.0 140.0
Capacidad de entrada y salida de aire Capacidad de salida de aire, ventosa automática
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DEPARTAMENTO TÉCNICO COMERCIAL
MANUAL TÉCNICO DE VÁLVULAS V ENTO SA
VÁLVULA VENTOSA MODELO D-060HF La válvula D-060HF es una válvula ventosa de doble efecto cuyo diseño dinámico permite la descarga de aire a alta velocidad de grandes caudales a la vez que es capaz de eliminar el aire de las tuberías con flujo de agua bajo presión. Esta válvula está indicada para evacuar grandes caudales de aire. El diseño especial del orificio de combinación de bronce y caucho de E.P.D.M. asegura un funcionamiento a largo plazo sin necesidad de mantenimiento.
DTC- MVV MV V 76/ 76/ 91
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DEPARTAMENTO TÉCNICO COMERCIAL
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Especificación de componentes
DTC- MVV MV V 77/ 77/ 91
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DEPARTAMENTO TÉCNICO COMERCIAL
MANUAL TÉCNICO DE VÁLVULAS V ENTO SA
Capacidad de entrada e ntrada y salida de aire
Capacidad de salida de aire, ventosa automática
DTC- MVV MV V 78/ 78/ 91
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DEPARTAMENTO TÉCNICO COMERCIAL
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DTC- MVV MV V 79/ 79/ 91
SISTEMA NS “NO SLAM” DE CIERRE LENTO PARA VÁLVULAS DE GRAN CAUDAL HF Descripción El sistema NS protege el sistema de conducción de agua de golpes de ariete en situaciones tales como separación de la columna de agua, bombeo de agua a profundidad y llenado rápido de agua de la tubería. El sistema NS es compatible con los modelos de válvulas ventosa combinadas D-060HF Los modelos disponibles son: MODELO DESCRIPCIÓN
PRESIÓN PRESI ÓN
TAMAÑOS DISPONIBLES
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DEPARTAMENTO TÉCNICO COMERCIAL
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Operación durante el llenado rápido de la tubería
DTC- MVV MV V 80/ 80/ 91
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VÁLVULA VENTOSA CON VÁLVULA DE CIERRE MODELO D-080 La válvula D-080 es una válvula combinada que incluye una válvula de cierre. Cuando esta válvula se cierra es posible desmontar el mecanismo
DTC- MVV MV V 81/ 81/ 91
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DEPARTAMENTO TÉCNICO COMERCIAL
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Especificación de componentes
DTC- MVV MV V 82/ 82/ 91
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DEPARTAMENTO TÉCNICO COMERCIAL
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Dimensiones y peso
Dimensión A (mm) Dimensión A con tapa (mm) Dimensión B (mm)
3” 310 445 414
4” 310 445 414
DTC- MVV MV V 83/ 83/ 91
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DEPARTAMENTO TÉCNICO COMERCIAL
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VÁLVULA VENTOSA SAAR MODELO D-020 Descripción La válvula D-020 es una válvula ventosa de doble
DTC- MVV MV V 84/ 84/ 91
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DEPARTAMENTO TÉCNICO COMERCIAL
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Especificación de componentes Núm Nombre Nombre 1 Codo de escape 1 ½“ 2 Conjunto de cierre
Materiales Materiale s Polipropileno Nylon reforzado
DTC- MVV MV V 85/ 85/ 91
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DEPARTAMENTO TÉCNICO
MANUAL TÉCNICO DE VÁLVULAS
DTC- MVV MV V
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