VD/SV-PA(L)
Pressure and Vacuum Relief Valve with pipe-away connection
Características
Función y descripción
Combined Pressure and Vacuum Relief Valve
The VD/SV-PA(L) Type PROTEGO® valve is a highly developed pressure and vacuum relief valve Soupape de surpression et dépression A pressure and vacuum relief valve is a pressure equalization valve for impermissible pressure and vacuum in a closed system. with excellent flow performance. Typically, the valve is installed in the in-breathing and out-breathing lines of tanks, vessels, and process equipment to protect against unallowable overpressure Surpression Overpressure refers to an increase in pressure in a system or vessel above the normal operating pressure. and underpressure. The valve prevents emission losses 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 prevents air intake almost up to the set vacuum Set vacuum Internal negative gauge pressure at which a vacuum valve first opens. . The product vapors can be released through a collective line connected to the line flange on the pressure side.
Full Lift Technology
The 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. will start to open as soon as the set pressure is reached and only requires 10% overpressure to full lift Course Lift is the actual travel of the valve pallet from the main valve out of the closed position. . Continuous investments in and a commitment to research and development have allowed PROTEGO® to develop a low pressure valve which has the same opening characteristic as a high pressure safety relief valve. This “Full Lift Type” technology allows the valve to be set at just 10% below the maximum allowable working pressure or vacuum Dépression Vacuum is the pressure in an enclosed space that is lower than the ambient pressure. (MAWP or MAWV) of the tank and still safely vent the required mass flow. The opening characteristic is the same for pressure and vacuum relief. Due to our highly developed manufacturing technology, 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 far superior to the conventional standard.
Advanced Manufacturing Technology
This feature is valve seats made of high quality stainless steel and achieved by valve seats made of high quality stainless steel and with precisely 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 the valve pallets from sticking when sticky products are used and to enable the use of corrosive substances. After the excess pressure is released or the vacuum is balanced, the valve reseats and provides a tight seal. The optimized fluid dynamic design of the valve body and valve pallet Clapet Valve pallet is the generic term for the assembly that rests on the valve seat. is a result of many years of research, resulting in a stable operation of the valve pallet, optimized performance, and reduced product losses.
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), use the flow capacity charts on the following pages
| VD / SV-PA | |||||||
| DN 1 | 50 / 2" | 80 / 3" | 100 / 4" | 150 / 6" | 200 / 8" | 250 / 10" | 300 / 12" |
| DN 2 | 50 / 2" | 80 / 3" | 100 / 4" | 150 / 6" | 200 / 8" | 250 / 10" | 300 / 12" |
| a | 405 / 15.95 | 480 / 18.90 | 600 / 23.62 | 805 / 31.69 | 925 / 36.42 | 1010 / 39.76 | 1010 / 39.76 |
| b | 390 / 15.35 | 485 / 19.09 | 550 / 21.65 | 660 / 25.98 | 780 / 30.71 | 875 / 34.45 | 875 / 34.45 |
| c | 150 / 5.91 | 180 / 7.09 | 200 / 7.87 | 250 / 9.84 | 300 / 11.81 | 305 / 12.01 | 305 / 12.01 |
| d | 240 / 9.45 | 300 / 11.81 | 330 / 12.99 | 390 / 15.35 | 480 / 18.90 | 555 / 21.85 | 582 / 22.91 |
| e | 165 / 6.50 | 192 / 7.56 | 240 / 9.45 | 350 / 13.78 | 390 / 15.35 | 460 / 18.11 | 460 / 18.11 |
| VD / SV-PAL | |||||||
| DN 1 | 50 / 2" | 80 / 3" | 100 / 4" | 150 / 6" | 200 / 8" | 250 / 10" | 300 / 12" |
| DN 2 | 80 / 3" | 100 / 4" | 150 / 6" | 200 / 8" | 250 / 10" | 300 / 12" | 350 / 14" |
| a | 395 / 15.55 | 445 / 17.52 | 565 / 22.24 | 770 / 30.31 | 895 / 35.24 | 1010 / 39.76 | 1010 / 39.76 |
| b | 400 / 15.74 | 485 / 19.09 | 550 / 21.65 | 655 / 25.79 | 775 / 30.51 | 875 / 34.45 | 885 / 34.84 |
| c | 140 / 5.51 | 143 / 5.63 | 165 / 6.50 | 216 / 8.50 | 267 / 10.51 | 305 / 12.01 | 305 / 12.01 |
| d | 255 / 10.04 | 308 / 12.13 | 355 / 13.98 | 417 / 16.42 | 505 / 19.88 | 582 / 22.91 | 603 / 23.74 |
| e | 165 / 6.50 | 192 / 7.56 | 240 / 9.45 | 350 / 13.78 | 390 / 15.35 | 460 / 18.11 | 460 / 18.11 |
Dimensiones en mm / pulgadas
Dimensions of pressure and vacuum relief valves with heating jacket upon request
Selección de materiales para la vivienda
| Design | A | B | C |
| Housing | Aluminium | Steel | Stainless Steel |
| Heating jacket (VD / SV-PA(L)-H-...) | – | Steel | Stainless Steel |
| Valve seat | Stainless Steel | Stainless Steel | Stainless Steel |
| Sealing | PTFE | PTFE | PTFE |
Option: Housing with ECTFE-lining
Special materials upon request
Selección de materiales para la válvula de presión
| Design | A | B | C | D | E | F |
| Pressure 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 | >+35 up to +60 >+14 up to +24 | >+14 up to +35 >+5.6 up to +14 | >+35 up to +60 >+14 up to +24 |
| Valve pallet | Aluminium | Stainless Steel | Stainless Steel | Stainless Steel | Stainless Steel | Stainless Steel |
| Sealing | FEP | FEP | Metal to Metal | Metal to Metal | PTFE | PTFE |
Special materials as well as higher set pressure upon request
Selección de materiales para la válvula de vacío
| Design | A | B | C | D | E | F |
| Pressure 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 <-5.6up to -14 | <-35 up to -60 <-14 up to -24 | <-35 up to -60 <-14 up to -24 |
| Valve pallet | Aluminium | Stainless Steel | Stainless Steel | Stainless Steel | Stainless Steel | Stainless Steel |
| Sealing | FEP | FEP | Metal to Metal | Metal to Metal | PTFE | PTFE |
Special material as well as higher set vacuum 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
The valve pallets are weight-loaded. Higher pressures can be achieved upon request with a special spring Ressort A spring is a spiral of wire which returns to its original shape after it is pressed or pulled. -loaded design. Choose the model (L) if the discharge nozzle has a nominal diameter that is greater than the nominal diameter of the tank filler neck.There are four different designs:
Additional special devices available upon request.
Any combination of vacuum and pressure levels can be set for the valve. When the difference between the pressure and vacuum exceeds 150 mbar / 60.2 inch W.C., special valve pallets are used.
Settings
| Pressure: | +2.0 mbar | +60 mbar |
| +0.8 inch W.C. | +24 inch W.C. | |
| Vacuum: | -2.0 mbar | -60 mbar |
| -0.8 inch W.C. | -24 inch W.C. |
Higher or 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”.
