UB/SF-G
Válvula de alívio de pressão e vácuo de diafragmaà prova de deflagração e combustão contínua
Features
Suitable for challenging applications
particularly suitable for problematic products such as styrene, acrylates, etc.
Safety Against Endurance Burning
Protection against Atmospheric Deflagration and Endurance Burning
Extreme Tightness
resulting in lowest possible
product
Product
Includes equipment, protective systems, devices, components and combinations of these.
losses and reduced environmental pollution
Optimal Pressure Maintenance
set pressure
Set pressure
Set pressure is the gauge pressure at the device inlet at which the relief device is set to start opening under service conditions.
close to opening pressure for optimum pressure
maintenance
Maintenance
Combination of all technical and administrative actions, including supervision actions, intended to maintain or restore a unit in working order.
in the system
Flow Capacity
optimized flow capacity
Protective System According to ATEX
can be used as a
protective system
Protective system
All devices, with the exception of components (see A.6) of the equipment, intended to immediately stop explosions and/or to limit the area affected by an explosion and separately placed on the market as autonomous systems.
in areas with potentially
explosive atmosphere
Explosive atmosphere
A mixture of air and flammable substance in the form of gases,
vapors, mists or dusts under atmospheric conditions in which, after ignition, spreads to the entire unburned mixture.
in accordance with ATEX
Safe Venting
flame arrester venting and ventilation of the pressurized chamber
Frost-Proof
optimal frost protection
Condensate Drainage
automatic condensate drain
Monitoring
monitoring of the load liquid by level indicator
Modular Design
allows replacement and cleaning of single FLAMEFILTER®
Easy operation Monitoring
and maintenance by simply opening the hinged valve cap
Function and Description
combined pressure and vacuum relief valve
The PROTEGO® UB/SF-G
diaphragm
Diaphragm
A diaphragm is a thin layer of material, which has a large surface area.
valve is the only
deflagration
Deflagration
Explosion propagating at subsonic velocity (EN 1127-1:1997).
-proof and
endurance burning
Endurance burning
Stabilized burning for an unlimited time.
-proof valve of its kind in the world. It is a highly developed combined pressure and
vacuum
Vacuum
Vacuum is the pressure in an enclosed space that is lower than the ambient pressure.
valve with dynamic and static
flame arresters
Flame Arresters
A flame arrester, deflagration arrester, or flame trap is a device or form of construction that will allow free passage of a gas or gaseous mixture but will interrupt or prevent the passage of flame.
. It is primarily used as a safety
device
Device
A device is a pipe component that influences the media flow by opening, closing, or partially shutting off the flow channel or by dividing or mixing the media flow.
for
flame transmission-proof
Flame transmission-proof
Characteristic of a device to avoid flashback.
in-breathing and out-breathing of tanks, containers, and process
equipment
Equipment
Machines, appliances, fixed or mobile devices, control parts and accessories, and warning and prevention systems, whether separate or combined, intended for the generation, transfer, storage, measurement, control, and conversion of energy, and for the processing of materials, which have their own potential source of ignition and may cause an explosion.
. The valve provides reliable protection against
overpressure
Overpressure
Overpressure refers to an increase in pressure in a system or vessel above the normal operating pressure.
and vacuum, prevents the in-breathing of air and product losses almost up to the set pressure, and protects against atmospheric deflagration and endurance burning if
stabilized burning
Stabilized burning
Steady burning of a flame stabilized at, or close to the flame arrester element.
occurs.
High Operational Reliability in Extreme Conditions
The PROTEGO® UB/SF-G diaphragm valve has proven itself over many years under a wide variety of operating conditions in the mineral oil and chemical industries. Worldwide, it is the only vent which works reliably with problem products such as styrene or acrylates. The set pressure is adjusted with a freeze resistant water-glycol mixture which ensures safe operation under extreme cold weather conditions. The valve type PROTEGO® UB/SF-G is used for those operating conditions, when heated product vapours condensate due to low ambient temperatures within the vacuum chamber (5) connected to the tank room. This would dilute the liquid load of the standard design type PROTEGO® UB/SF, whereas PROTEGO® UB/SF-G allows the condensate to flow back into the tank via punched diaphragm.
For Explosion group IIB3
The PROTEGO® UB/SF-G valve is available for substances up to
explosion
Explosion
Abrupt oxidation or decomposition reaction producing an increase in temperature, pressure, or in both simultaneously.
group IIB3.
When the pressure in the tank reaches the set pressure, the diaphragm (1) on the outer
valve seat
Valve seat
The valve seat is a component on which the valve pallet rests when the valve is closed.
ring (2) is lifted and vapors are released into the environment. The set pressure is adjusted by weight of the liquid load (water-glycol mixture) in the outer ring chamber (3). The overpressure chamber is equipped with an opening (4) to keep the pressure in balance. The opening is equipped with a FLAMEFILTER® to prevent flame transmission into the overpressure chamber. The overpressure is adjusted via the filling level of the load liquid in the chamber and can be checked by a floating level indicator (7).
Composition
If there is vacuum within the tank, the pressure part of the diaphragm (9) is pressed on the valve seat (2) by the liquid load as well as by the atmospherical pressure within the pressure valve chamber, which provides additional sealing. If the tank vacuum, which exists also in the valve chamber (5) because of the holes in the diaphragm part (6), exceeds the valve set pressure, the vacuum part of the diaphragm (10) lifts up due to the external atmospheric pressure, which exists in the valve internal and air flows into the tank.
Advanced Sealing Technology and Dynamic Flame Arresting in Overpressure Relief Valve
If the set pressure is exceeded, explosive gas/air or product vapor/air mixtures are released into the atmosphere. The speed at which these mixtures exit the annular gap between the diaphragm and the outer valve seat ring is considerably greater than the flame speed. If this mixture ignites,
flashback
Flashback
Phenomenon occurring in a flammable mixture of air and gas when the local velocity of the combustible mixture becomes less than the flame velocity, causing the flame to travel back to the point of mixture.
into the tank is prevented. If the mixture flow continues, the dynamic flame arresting feature prevents a flashback, even in case of endurance burning. Even at relatively low flow rates, e.g., during thermal out-breathing, the gap formed by the volumetric flow is so narrow, that flames in the gap are extinguished and a flashback is prevented.
Main component - PROTEGO® flame arrester
At very low pressure settings, the explosion pressures resulting from an atmospheric deflagration may be strong enough to
lift
Lift
Lift is the actual travel of the valve pallet from the main valve out of the closed position.
the diaphragm off the valve seat rings. The ignition into the tank can be prevented by installing the
PROTEGO® flame arrester unit
PROTEGO® flame arrester unit
The PROTEGO® flame arrester unit is the main component of a flame arrester. It prevents flame propagation.
(8). This PROTEGO® flame arrester unit provides additional protection against atmospheric deflagration when the valve is open for maintenance and inspection.
Many Individual Certifications
The valve can be used at an
operating temperature
Operating temperature
Temperature reached when the equipment is operating under design conditions.
of up to +60°C / 140°F and meets the requirements of European tank design standard EN 14015 (Appendix L) and ISO 28300 (API 2000).
EU conformity according to the currently valid ATEX directive. Approvals according to other national/international regulations on request.
Product Data and Features
Tabela de dimensões
Para escolher o diâmetro nominal (DN), veja os diagramas de vazão nas páginas seguintes
| DN | Pressão | 80 / 3" | Pressão | 100 / 4" | Pressão | 150 / 6" |
| a | até +28 mbar | 615 | até +28 mbar | 645 | até +25 mbar | 680 |
| a | > +28 mbar | 765 | > +28 mbar | 795 | > +25 mbar | 830 |
| b | 410 | 485 | 590 |
Dimensões em mm
Ajustes de pressão > +50 mbar (DN 80), > +45 (DN 100), > +46 (DN 150) com dimensões de construção de guarnição adicional sob solicitação
Dimensões de construção para a válvula de alívio de pressão e de vácuo de diafragma com serpentina de aquecimento sob solicitação
Seleção do grupo de explosão
| MESG | Gr. expl. (IEC / CEN) | Grupo gás (NEC) |
| ≥ 0,65 mm | IIB3 | C |
Aprovações especiais sob solicitação
Tipo de conexão flangeada
| EN 1092-1; Form B1 |
| ASME B16.5 CL 150 R.F. |
Outras conexões sob solicitação
Versão e especificação
Quase todas as faixas de pressão e vácuo da válvula podem ser combinadas livremente. O diafragma é calibrado por líquido. Para pressões de ajuste maiores está disponível, sob solicitação, uma versão especial com guarnição adicional. Em grandes diferenças entre pressão e vácuo, utilizam-se versões especiais com disco de vácuo calibrado por peso.Estão disponíveis duas versões:
Válvula de alívio de pressão e vácuo de diafragma na versão básicaUB/SF - G
Válvula de alívio de pressão e de vácuo de diafragma com serpentina de aquecimento (temperatura máx. do meio de aquecimento +85°C)UB/SF - G - H
Além da versão padrão também é possível fornecer uma série de construções especiais especialmente desenvolvidas mediante consulta (p. ex. para tanque de acrilato ou de estireno etc.), que atendem de forma especial aos requisitos das condições de operação específi cas nestes produtos.
Ajustes de pressão
| DN 80 | +3.5 mbar | +50 mbar |
| +1.4 inch W.C. | +20 inch W.C. | |
| DN 100 | +3.5 mbar | +45 mbar |
| +1.4 inch W.C. | +18 inch W.C. | |
| DN 150 | +3.5 mbar | +46 mbar |
| +1.4 inch W.C. | +18.4 inch W.C. | |
| Vácuo: | -3,5 mbar; -5 mbar; -7 mbar (Festwerte) |
Ajustes de pressão maiores até 140 mbar em versão especial com guarnição adicional assim como ajustes de pressão menores sob solicitação. Ajustes de vácuo mais altos sob solicitação
Seleção do material do corpo
| Execução | C | D |
| Corpo | Aço | Aço inoxidável |
| Parte superior da válvula | Aço inoxidável | Aço inoxidável |
| Serpentina de aquecimento (UB / SF-H-...) | Aço inoxidável | Aço inoxidável |
| Sedes de válvulas | Aço inoxidável | Aço inoxidável |
| Vedação | FPM | PTFE |
| Diafragma | A, B | A, B |
| Conjunto abafador de chamas | C | C |
Os corpos também podem ser fornecidos com revestimento de ECTFE
Materiais especiais sob solicitação
Seleção do material
| Execução | A | B |
| Diafragma | FPM | FEP |
Materiais especiais sob solicitação
Combinações de material do conjunto abafador de chamas
| Execução | A | C |
| Armação do FLAMEFILTER® | Ferro fundido | Aço inoxidável |
| FLAMEFILTER® | Aço inoxidável | Aço inoxidável |
| Espaçador | Aço inoxidável | Aço inoxidável |
Materiais especiais sob solicitação
Diagrama de vazão
UB/SF-G DN100 pressure
UB/SF-G DN150 pressure
UB/SF-G DN80 vacuum
UB/SF-G DN100 vacuum
UB/SF-G DN150 vacuum
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.
Applications