Características
Função e descrição
Highly Developed Vacuum Relief Valve
The VN-VL-L Type PROTEGO® valve is a highly developed vacuum relief valve Válvula de vacío A vacuum relief valve is used to ventilate a part of the system and protects it from impermissible underpressure. with excellent flow performance. It is primarily used as a device Bastidor 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 relieving vacuum Vacío Vacuum is the pressure in an enclosed space that is lower than the ambient pressure. in tanks, containers, and process engineering 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 offers reliable protection against vacuum and prevents in-breathing of air close to the set pressure Presión de reacción Set pressure is the gauge pressure at the device inlet at which the relief device is set to start opening under service conditions. .
Full Lift Technology
The device will start to open as soon as the set pressure is reached and only requires 10% overpressure Presión excesiva Overpressure refers to an increase in pressure in a system or vessel above the normal operating pressure. to reach full lift Carrera 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 characteristics 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 of the tank and still safely vent the required mass flow.
Advanced Manufacturing Technology
Due to our highly developed manufacturing technology, the tank pressure Presión del tanque 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. This feature is achieved by valve seat Asiento de válvula The valve seat is a component on which the valve pallet rests when the valve is closed. made of high quality stainless steel and with precisely lapped valve pallets (1). After the vacuum is released, the valve reseats and provides a tight seal Sello 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. again.
Tabela de dimensões
| NG | 300 / 12" | 300 / 12" | 300 / 12" |
| DN | 300 /12" | 350 / 14" | 400 /16" |
| a | 570 / 22.44 | 570 / 22.44 | 570 / 22.44 |
| b | 215 / 8.46 | 235 / 9.25 | 255 / 10.94 |
| c | 467 / 18.17 | 487 / 19.17 | 507 / 19.96 |
| d | 243 / 9.57 | 268 / 10.55 | 298 / 11.73 |
| e | 500 / 19.69 | 500 / 19.69 | 500 / 19.69 |
| f | 810 / 31.89 | 810 / 31.89 | 810 / 31.89 |
| g | 770 / 30.31 | 770 / 30.31 | 770 / 30.31 |
Dimensões em mm
Dimensões para a válvula de vácuo com camisa de aquecimento sob solicitação
Seleção do material do corpo
| Design | A | B | C | E | F |
| Design Data | 2 bar/60°C | 2 bar/200°C | 2 bar/200°C | 16 bar/60°C or 10 bar/200°C | 16 bar/60°C or 10 bar/200°C |
| Housing | Aluminium | Steel | Stainless Steel | Steel | Stainless Steel |
| Valve seat | Stainless Steel | Stainless Steel | Stainless Steel | Stainless Steel | Stainless Steel |
| Protective grating | Stainless Steel | Stainless Steel | Stainless Steel | Stainless Steel | Stainless Steel |
| Sealing | PTFE | PTFE | PTFE | PTFE | PTFE |
Os corpos também podem ser fornecidos com revestimento de ECTFE
Materiais especiais sob solicitação
Seleção do material do disco da válvula de vácuo
| Design | C | D | E | F |
| vacuum range [mbar] [inch W.C.] | -2.7 up to -4.6 -1.08 up to -1.84 | -4.6 up to -7.9 -1.84 up to 3.16 | -7.9 up to -13.5 -3.16 up to -5.4 | -13.5 up to -70 -5.4 up to -28 |
| Max. Back pressure (up to 60°C) [mbar] [inch W.C.] | 390 156 | 2700 1080 | 930 372 | 6400 2560 |
| Valve pallet | Aluminium, thin | Aluminium, thick | Stainless Steel, thin | Stainless Steel, thick |
| Sealing | Metal to Metal | Metal to Metal | Metal to Metal | Metal to Metal |
Materiais especiais (alumínio revestido, titânio, Hastelloy) e ajustes de vácuo mais altos 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
O obturador da válvula é calibrado por peso. Para vácuos de ajuste mais altos está disponível, sob solicitação, uma versão especial calibrada por mola.Estão disponíveis duas versões:
Outros dispositivos especiais sob solicitação
Ajustes de pressão
| Vácuo: | -2.7 mbar | -70 mbar |
Ajustes de vácuo mais altos sob solicitação.
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.
