High Velocity Pressure Relief Valve deflagration- and endurance burning-proof
Función y Descripción
The deflagration- and endurance burning-proof PROTEGO® DE/S type device is a state of the art high velocity vent valve working on the principle of a dynamic flame arrester. It is primarily used as a safety device for flame transmission proof venting of cargo spaces and loading systems for in land water way barges during the loading process and on the journey. The valve offers reliable protection against excess pressure, prevents product losses almost up to the set pressure and provides protection against atmospheric deflagrations as well endurance burning if stabilized burning occurs. The PROTEGO® DE/S high velocity vent valve is available for substances of explosion group IIB (NEC group B MESG ≥ 0.5 mm).
The valve cone (1) is kept in a closed position by a corrosion resistant permanent magnet (2). The set pressure is adjusted by the distance of the permanent magnet to its counterpart (3). Upon reaching the set pressure, the valve opens directly to a full lift with only a minor pressure rise (jump characteristic). The set pressure is therefore very close to the maximum allowable working pressure (MAWP) of the cargo space.
The tank pressure is maintained up to the set pressure with a tightness that is far superior to the conventional standard due to our state of the art manufacturing technology. This feature is ensured by valve seats made of high-quality stainless steel with an individually lapped valve cone. After the excess pressure is discharged, the valve reseats and provides a tight seal. The design of the valve cone and valve seat produces a vertical, free jet that transports the gases far away from the discharge opening. This keeps the deck free of gas.
The shape of the valve cone and valve seat promotes the Drainage of rainwater when closed. A function check of the valve is easily performed with a manual lift gear (4) which returns to its
initial position after actuation. A lateral flange connection, DN2, is standard for a vacuum valve (such as the PROTEGO® SV/ES).
If the set pressure is exceeded, explosive gas/product-vapour air mixtures are released to the atmosphere. When reaching the adjusted set pressure, the velocity at which the mixtures exit
the valve cone gap (5) (the gap between the valve seat and the valve cone) is much higher than the flame velocity. If this mixture ignites, flashback into the tank is prevented. If the mixture flow
continues and stabilized burning occurs, the dynamic flame arresting feature prevents flashback ignition even in the case of endurance burning. As the system pressure decreases, the discharge
velocity at the valve cone gap decreases also. The design ensures, that even in the closing pressure range, the valve cone closes in a timely manner keeping the discharge velocity far above the flame velocity and thereby preventing flashback.
The valve can be used up to an operating temperature of +60°C / 140°F and meets the requirements of ADN for type C ships and type N ships.
Type-approved in accordance with EN ISO 16852 as well as other international standards.
Características especiales y ventajas
pressure is set with corrosion resistant permanent magnet
jump characteristic within minimum overpressure to a full lift
excellent tightness for minimum product loss and environmental pollution
set pressure very near to the relieving pressure enables optimum pressure maintenance in the system
can be used as a protective system according to ATEX in areas subject to an explosion hazard
protection against atmospheric deflagrations and endurance burning
high flow capacity
internal parts protected by bellows
manual lift gear to pop valve cone
side connection for a vacuum relief valve
design promotes rain water drainage
prevents gas build up on deck
specially developed for in land water way barges
+40 inch W.C.
+200 inch W.C.
Higher or lower pressure settings 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”.
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