VD/SV-HR
Pressure/Vacuum Relief Valve deflagration- and endurance burning-proof
Características
Función y descripción
Combined Pressure and Vacuum Relief Valve
The Deflagration-Proof and Endurance Burning-Proof VD/SV-HR Type PROTEGO® valve is a highly developed combined pressure/vacuum relief valve Soupape de surpression/dépression Pressure/vacuum relief valve is an umbrella term that includes pressure or vacuum relief valve as well as pressure and vacuum relief valve. for high flow capacities with an integrated flame arrester. It is primarily used as a device Appareil 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 in tanks, containers, and process equipment. The valve offers reliable protection against overpressure Surpression Overpressure refers to an increase in pressure in a system or vessel above the normal operating pressure. and vacuum Dépression Vacuum is the pressure in an enclosed space that is lower than the ambient pressure. , prevents out-breathing of product vapor and in-breathing of air almost up to the set pressure Pression de réponse Set pressure is the gauge pressure at the device inlet at which the relief device is set to start opening under service conditions. , and protects against atmospheric deflagration and endurance burning Endurance burning Stabilized burning for an unlimited time. if stabilized burning occurs. The PROTEGO® Flame Arrester Unit is designed to achieve minimum pressure drop with maximum safety. The Deflagration and Endurance Burning-Proof PROTEGO® VD/SV-HR device is available for substances from explosion groups IIA to IIB3 (NEC group D to C MESG ≥ 0.65 mm).
10%-Technology
If the set pressure is reached for a valve approved for explosion group IIA (NEC group D), the valve starts to open and reaches full lift Course Lift is the actual travel of the valve pallet from the main valve out of the closed position. within 10% overpressure. This unique 10% technology nables a set pressure that is only 10% below the maximum allowable working pressure (MAWP) of the tank. After years of development, this typical opening characteristic of a safety relief valve is now also available for the low pressure range.
Advanced Manufacturing Technology
Valves approved for explosion group IIB3 (NEC group C) function proportionally, so the set pressures should be selected in relation to the proportional behavior (such as a 10%, 40%, or 100% overpressure from the set pressure to the relieving pressure Pression d'ouverture The relieving pressure is the vacuum or overpressure at which the valve reaches the lift required for the mass flow to be discharged. at which the required flow performance is reached). The tank pressure Pression de la cuve Tank pressure is the pressure within a tank. is maintained up to set pressure with a tightness that is above the normal standards due to our stateof- the-art manufacturing technology. This feature is ensured by the valve seats made of high quality stainless steel and with individually lapped valve pallets (1), or with an air cushion seal Joint A seal prevents or limits unwanted transfer of product from one container to another. Seal is used as superordinate term for all types of sealing elements. (2), in conjunction with high quality FEP diaphragm Membrane A diaphragm is a thin layer of material, which has a large surface area. . The valve pallets are also available with a PTFE seal to prevent them from sticking when sticky substances are used and to enable the use of corrosive fluids. After the overpressure is released, the valve re-seats and provides a tight seal.
Main Component – PROTEGO® Flame Arrester Unit
If the set pressure is exceeded, explosive gas/product vapor/air mixtures are released into the atmosphere. If this mixture ignites, the integrated PROTEGO® Flame Arrester Unit (3) prevents flame transmission into the tank. If additional mixture continues to flow and stabilized burning occurs, the integrated Flame Arrester unit prevents flashback as a result of endurance burning. The valve is protected and also fulfils its function under these severe conditions. The spring Ressort A spring is a spiral of wire which returns to its original shape after it is pressed or pulled. -loaded weather hood Capot de protection contre les intempéries A weather hood is a cover to protect the internal components of a device from environmental influences. opens as soon as the melting element Elément fusible The melting element is a component that consists of a housing with a lower and upper part. (4) melts.
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.
Dimensiones
To select the nominal size Diamètre nominal The nominal size is an alphanumeric designation of size for components in a piping system, used for reference purposes, comprising the letters DN followed by a dimensionless integer that is indirectly related to the physical size of the bore or outside diameter of the connections, expessed in millimeters. (DN), please use the flow capacity charts on the following pages
| DN | 80 / 3" | 100 / 4" |
| a | 500 / 19.69 | 543 / 21.38 |
| b | 477 / 18.78 | 577 / 22.72 |
| c | 353 / 13.90 | 353 / 13.90 |
Dimensiones en mm / pulgadas
Selección de materiales para la vivienda
| Design | A | B |
| Housing | Steel | Stainless Steel |
| Valve saets | Stainless Steel | Stainless Steel |
| Gasket | PTFE | PTFE |
| Weather hood | Stainless Steel | Stainless Steel |
| Flame arrester unit Flame arrester unit Flame arrester casing with FLAMEFILTER® set. | A | A |
Special materials upon request
Combinación de materiales para la unidad apagallamas
| Design | A |
| FLAMEFILTER® cage | Stainless Steel |
| FLAMEFILTER® | Stainless Steel |
Special materials upon request
Selección de materiales para la válvula de presión
| Design | A | B | C | D |
| Pressure range [mbar] [inch W.C.] | +3.5 up to +5.0 +1.4 up to +2.0 | >+5.0 up to +14 >+2.0 up to +5.6 | >+14 up to +35 >+5.6 up to +14 | >+14 up to +35 >+5.6 up to +14 |
| Valve pallet | Aluminium | Stainless Steel | Stainless Steel | Stainless Steel |
| Sealing | FEP | FEP | Metal to Metal | PTFE |
Special material as well as higher set pressure upon request
Selección de materiales para la válvula de vacío
| Design | A | B | C | D |
| Vacuum range [mbar] [inch W.C.] | -2.0 up to -3.5 -0.8 up to -1.4 | <-3.5 up to -14 <-1.4 up to -5.6 | <+14 up to +35 <-5.6 up to -14 | <-14 up to -35 <-5.6 up to -14 |
| Valve pallet | Aluminium | Stainless Steel | Stainless Steel | Stainless Steel |
| Sealing | FEP | FEP | Metal to Metal | PTFE |
Special material as well as higher set vacuum Set vacuum Internal negative gauge pressure at which a vacuum valve first opens. upon request
Selección del grupo de explosión
| MESG | Expl. Gr. (IEC / CEN) | Gas Group (NEC) |
| > 0,90 mm | IIA | D |
| ≥ 0,65 mm | IIB3 | C |
Special approvals upon request
Tipo de bridas de conexión
| EN 1092-1; Form B1 |
| ASME B16.5 CL 150 R.F. |
other types upon request
Modelo y especificación
Any combination of vacuum and pressure levels can be set for the valveThe valve discs are weight-loaded.
Additional special devices available upon request
Settings
| Pressure: | +3.5 mbar | +35 mbar |
| +1.4 inch W.C. | +14 inch W.C. | |
| Vacuum: | -2.0 mbar | -35 mbar |
| -0.8 inch W.C. | -14 inch W.C. |
Higher and lower 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”.
