AL-DK

Name: AL-DK
Brand: PROTEGO
SKU: prod3704954016417

Válvula de haste

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Features

Venting and Breathing of Floating Roof Tanks

The device is used for automatic venting and breathing of floating roof tanks

Low position of the Floating Roof

In the low position of the floating roof, the valve opens automatically to prevent vacuum or overpressure

Different Heights

Due to different heights of the floating roof's low position for operational and assembly settings, specific dimensions must be provided

Conversion

During the conversion of the floating roof's support legs from operational to maintenance position, the plunger must be extended

Adjustment through an adjustment option

Adjustment is achieved through an adjustment option using a locking pin secured with a cotter pin

Not flame transmission proof

The valve is not flame transmission proof

Function and Description

Automatic Venting Valves for Floating Roof Tanks

PROTEGO® -actuated vent valves type AL-DK provide automatic venting of 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 during final draining or inadmissible pressure during refilling.

Design of Valves

The PROTEGO® AL-DK valve consists of a (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 (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 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 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

Dimensões em mm

Material

Corpo	Aço
Guia da Válvula	Aço
Vedação	FPM

Materiais especiais mediante consulta

Seleção e Desenho

A determinação da quantidade necessária das válvulas de haste e do diâmetro nominal DN ocorre em função da vazão volumétrica calculada (m³/h), da potência da bomba e da potência térmica na posição inferior do teto flutuante e em função da pressão máxima admissível do tanque p_T (mbar) de acordo com o diagrama de vazão volumétrica. São possíveis versões especiais.

As vazões volumétricas e perdas de pressão das calotas de respiro PROTEGO^® BE/HR ou PROTEGO^® LH/AD devem ser levados em consideração adicionalmente, de acordo com os respectivos diagramas nos folhetos específicos ou manuais de operação.

Se for desejada apenas a desaeração e ventilação podem ser aplicadas as válvulas de haste PROTEGO^® AL 200.

Dados necessários para a especificação

Produto armazenado
Diâmetro do tanque (m)
Altura do tanque (m)
Altura do suporte h₁ (posição de operação com tanque vazio)
Altura do suporte h₂ (posição de montagem elevada)
Pressão máxima admissível do tanque p_T (mbar)
Potência da bomba (m³/h)

Tipo de conexão flangeada

EN 1092-1, forma B1 ou DIN 2501, forma C, PN 16 , a patir DN 200 PN 10	EN ou DIN
ASME B16.5 CL 150 R.F.	ASME

Outras conexões mediante consulta

Versão e especificação

Two designs are available:

Vent valve with two connectionsAL-DK

Vent valve with four connectionsAL-DK-4

Diagrama de vazão

Este diagrama de vazão foi determinado em uma bancada de medição de vazão calibrada e certificada pela TÜV. A vazão V em m³/h se refere ao estado técnico padrão de ar, conforme ISO 6358 (20°C, 1bar). Para conversão em outras densidades e temperaturas, veja o cap. 1: Bases técnicas.

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Lift-actuated vent valves of type PROTEGO^® AL-DK can be combined with vent caps type EB which are deflagration Deﬂagration Explosion propagating at subsonic velocity (EN 1127-1:1997). proof and resistant against endurance burning Endurance burning Stabilized burning for an unlimited time. . This ensures flame transmission proof ventilation.

Se não for exigida segurança contra combustão contínua, também é possível uma combinação com dispositivos à prova de deflagração do tipo PROTEGO^® LH/AD. Os respectivos folhetos podem ser encontrados no capítulo 2 "Calotas de respiro".