Archive for the ‘válvula seguridad’ Category

Caldera y sala de calderas.

Miércoles, julio 18th, 2012

Estamos en la era de la tecnología o microtecnología, se fabrica lo último, lo más moderno y cuanto más pequeño mejor. Parece ser que el espacio es un bien escaso y tendemos a concentrarlo todo hasta límites insospechados.

Un ejemplo claro son las calderas de calefacción, en un espacio de 4o-45 cmts. de ancho, por 30-35 cmts. de fondo y 70-90 cmts. de alto, tenemos todos los elementos de cualquier sala de calderas de una comunidad de propietarios.  Incluso cada vez las calderas son más reducidas y con menor peso.

Caldera de calefacción.

Quien podría pensar hace más de 25 años, cuando la calefacción era solo para privilegiados que vivían en comunidades con calefacción central, que cualquier ciudadano tendría en su casa una caldera de calefacción, con el mismo servicio que disfrutan los usuarios con calefacción centralizada.

Para llegar a conseguir esto, ha explotado, en el mejor sentido de la palabra, el boom del gas natural canalizado o gas ciudad como llaman algunos usuarios. Los fabricantes se han empleado a fondo y han cojido la ola del progreso, de la modernidad, para ofrecer un servicio de calefacción que sea posible para todo el mundo.

Si analizamos los elementos de una caldera, tenemos que son los mismos de cualquier sala de calderas por muy grande o por mucha potencia que consuma.

Tenemos el circuito del agua caliente, el circuito de la calefacción, el intercambiador de placas, la válvula de seguridad, la válvula de llenado, el vaso de expansión, la bomba recirculadora, el manómetro, el purgador, la válvula de tres vías, etc.

Entonces ¿ las salas de calderas están sobredimensionadas ?, ¿ es necesario tanto espacio y calderas tan grandes en las salas de calderas ?. La respuesta es si, la diferencia está en la potencia. No es lo mismo una caldera para 40 vecinos que para un solo usuario.

El funcionamiento es el mismo, pero el tamaño es diferente. En este caso, el tamaño si importa.

Después de analizar las diferencias de una caldera a una sala de calderas, que nos quedará por ver. Minipisos con mini lavadoras, mini lavaplatos, mini microondas, etc.

El futuro es prometedor e incierto.

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Regulador de presión para la vivienda.

Sábado, abril 2nd, 2011

¿Para qué sirve un regulador de presión ?, como su nombre indica su función es regular la presión. En este caso hablaremos del regulador de presión del agua.

Regulador presión de agua.

Pero ¿cuando hay que poner un regulador?. En pisos, chalets, locales, donde la presión de entrada sea alta, por encima de los 4 bar, es recomendable poner un regulador con el fín de proteger la instalación de fontanería, los tubos, griferías y otros elementos.

Los componentes de las instalaciones están preparados para soportar presiones superiores a 4 bar pero en determinados casos como en calderas, termos eléctricos y calentadores, un regulador alarga la vida de estos aparatos.

En los termos puede suceder que si la presión es alta, la válvula de seguridad salte y provoque un continuo goteo de la misma. Si la válvula está conducida a un desague, el problema es llevadero pero si es lo contrario, tenemos un problema.

En las calderas, los fabricantes aconsejan que las presiones de entrada a las mismas no sean altas, por encima de los 3,5 o 4 bar, ya que las regulaciones y elementos internos, no funcionan adecuadamente.

El regulador, ayudado por un manómetro en la salida, nos ayuda a controlar la presión que queremos tener y a proteger las instalaciones.

Sin embargo, si no tenemos suficiente presión en la entrada a nuestra vivienda, necesitaremos bombas de presión para elevar la pobre presión de la red.

Los usuarios cada vez están más concienciados con la protección como prevención y los reguladores son parte de esa acción.

Vaso de expansión para el termo eléctrico.

Viernes, marzo 25th, 2011

Estéticamente es muy llamativo pero necesario. El vaso de expansión para los termos eléctricos es la solución al continuo goteo de la válvula de seguridad.

Pero, ¿ porqué gotea la válvula de seguridad del termo ?. La explicación es muy sencilla. Aparte de que la presión de la red que tengamos en nuestra vivienda, tiene que ver, también hay que entender que el agua acumulada en el termo eléctrico, al calentarse aumenta el volúmen y la presión. Ese incremento de presión y de volúmen, necesita expansionarse hacia algún sitio ya que el termo tiene su capacidad y no se estira ni se encoje como si fuera chicle.

Vaso de expansión.

Ahí es cuando se entiende la función del vaso de expansión. Como su nombre indica sirve para que el agua y la presión se expansionen hacia su interior.

¿ Cómo funciona el vaso de expansión ?, el vaso incorpora una membrana de goma y de fábrica viene tarado a una presión con el objeto de que al incrementar la presión del termo, esta empuje y venza la presión del vaso y se desplace hacia el mismo. Permitiendo las absorciones y expansiones dentro del vaso.

¿Que vaso poner?, tiene que ser al menos de un 8% del volúmen del termo. Ejemplo, termo de 100 litros, poner un vaso de 8 litros.

¿Qué pasa si no se pone el vaso de espansión ?, lo más probable es que la válvula de seguridad llegue a gotear en determinados momentos, por no poder soportar el incremento de presión empujado desde el termo.

Si no queremos colocar el vaso, una opción será conducir la válvula de seguridad del termo a un desague, con el fin de que cuando gotee, no caiga al suelo.

La instalación perfecta de un termo es la siguiente. Termo, vaso de expansión, llave de bloqueo para el termo en la fría, conducción de la válvula de seguridad a desague y regulador de presión en la entrada de agua general a la casa.