AL-DK
Vent Valve, Lift-actuated
Features
Ventilación y respiración de tanques de techo flotante
El dispositivo se usa para el venteo y la respiración automáticos de tanques de techo flotante
Posición de reposo del techo flotante
En la posición de reposo del techo flotante, la válvula se abre automáticamente para evitar vacío o sobrepresión
Diferentes alturas
Debido a las diferentes alturas de la posición baja del techo flotante para los ajustes de operación y montaje, deben facilitarse dimensiones específicas
Conversión
Durante la conversión de las patas de apoyo del techo flotante de la posición de operación a la posición de mantenimiento, el émbolo debe extenderse
Ajuste mediante una opción de regulación
El ajuste se realiza mediante una opción de regulación con un pasador de bloqueo asegurado con una chaveta
No resistente a la transmisión de llamas
La válvula no es a prueba de transmisión de llama
Function and Description
Automatic Venting Valves for Floating Roof Tanks
PROTEGO® Lift-Actuated Vent Valves Type AL-DK provide automatic venting of floating roof tanks when the floating roof is lowered onto its supports and the tank is either drained or refilled. When the floating roof is in its lowest position, the valve is forced to open through lift actuation, which prevents inadmissible vacuum during final draining or inadmissible pressure during refilling.
Design of Valves
The PROTEGO® AL-DK valve consists of a housing (1) with a sheet metal panel to be welded onto the floating roof or a flange for mounting on a mating flange, two or four connection nozzles (2) for installation of vent caps, cover (3), lift (4) including valve disc (5), lift pipe (6), and the condensate drain valve (7) which can be designed to be flame transmission proof. The condensate drain is sealed by a flat gasket attached to the valve disk (5). The cover (3) is sealed by a sealing cord (8).
Dimensions for Different Floating Roof Heights
As the lowest position of the floating roof varies for operation and assembly, specify the dimensions h1 and h2:
h1: Distance between the lower edge of sheet-metal panel (or mounting flange) and the tank bottom in lowest position of floating roof (operating position with an empty tank).
h2: Distance between the floating roof in lifted maintenance position and the height of the floating roof in fully lowered operating position (operating position with an empty tank).
Conversion of Floating Roof Supports and Extension of the Plunger
If the floating roof supports are changed from operating position to maintenance position, the lift has to be extended as well. This is done with an adjustable locking pin that is secured with a split pin.
The valve is not flame transmission proof.
Based on a hazard analysis with regard to material selection and function, the valves have no potential ignition sources. As a result, they are not subject to the European Explosion Protection Directive (ATEX) when used in explosive atmospheres.
Product Data
Maßtabelle für AL-DK und AL-DK-4
| AL-DK | AL-DK-4 | |||||||
| DN1 | 200 / 8" | 200 / 8" | 200 / 8" | 200 / 8" | 250 / 10" | 250 / 10" | 200 / 8" | 200 / 8" |
| DN2 | 80 /3" | 100 /4" | 150 / 6" | 200 / 8" | 150 / 6" | 200 / 8" | 100 /4" | 200 / 8" |
| a | 350 / 13.78 | 350 / 13.78 | 350 / 13.78 | 350 / 13.78 | 350 / 13.78 | 350 / 13.78 | 350 / 13.78 | 350 / 13.78 |
| b | 465 / 18.31 | 465 / 18.31 | 465 / 18.31 | 515 / 20.28 | 465 / 18.31 | 515 / 20.28 | 465 / 18.31 | 650 / 25.59 |
| c | 870 / 34.25 | 870 / 34.25 | 870 / 34.25 | 870 / 34.25 | 870 / 34.25 | 870 / 34.25 | 870 / 34.25 | 870 / 34.25 |
| d | 450 / 17.72 | 450 / 17.72 | 450 / 17.72 | 450 / 17.72 | 450 / 17.72 | 450 / 17.72 | 450 / 17.72 | 600 / 23.62 |
| e | 345 / 13.58 | 360 / 14.17 | 385 / 15.16 | 415 / 16.34 | 385 / 15.16 | 415 / 16.34 | 415 / 16.34 | 415 / 16.34 |
| f | 460 / 18.11 | 445 / 17.52 | 285 / 11.22 | 370 / 14.57 | 285 / 11.22 | 367 / 14.45 | 445 / 17.52 | 370 / 14.57 |
| x | 658 / 25.91 | 920 / 36.22 | ||||||
Dimensiones en mm / pulgadas
Material
| Housing | Steel |
| Valve guide | Stainless Steel |
| Gasket | FPM |
Special materials upon request
Tipo de bridas de conexión
| EN 1092-1; Form B1 | andere Anschlüsse auf Anfrage |
| ASME B16.5 CL 150 R.F. |
Other types upon request
Diagrama de flujo volumétrico
Los diagramas de flujo volumétrico han sido determinados con un banco de pruebas de caudal calibrado y certifi - cado por TÜV. El flujo volumétrico V. en [m³/h] y el CFH se refi eren a las condiciones estándar de referencia de aire según ISO 6358 (20°C, 1bar). La conversión a otras densidades y temperaturas están referidas en el Vol. 1: “Fundamentos Técnicos”.
Application Examples for PROTEGO® AL-DK
Lift-actuated vent valves of type PROTEGO® AL-DK can be combined with vent caps type EB which are deflagration proof and resistant against endurance burning. This ensures flame transmission proof ventilation.
If resistance against endurance burning is not required the valves can alternatively be combined with PROTEGO® deflagration proof devices type PROTEGO® LH/AD. The applicable data sheets are available in volume 2 “Deflagration Flame Arresters, end-of-line and Vent Caps”.
