VN-VL-L
Válvula de vácuo
- 10% technology for minimum pressure increase up to full lift
- extreme tightness, resulting in lowest possible product losses and reduced environmental pollution
- set pressure close to opening pressure for optimum pressure maintenance in the system
- very high flow capacity
- valve pallet is guided inside the housing to protect against harsh weather conditions
- can be used in explosion hazardous areas
- automatic condensate drain
- best technology for API tanks
Função e descrição
The VN-VL-L type PROTEGO® valve is a highly developed vacuum relief valve with excellent flow performance. It is primarily used as a device for relieving vacuum in tanks, containers, and process engineering equipment. The valve offers reliable protection against vacuum and prevents in-breathing of air close to the set pressure.
The device will start to open as soon as the set pressure is reached and only requires 10% overpressure to reach full lift. 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.
Due to our highly developed manufacturing technology, the tank pressure is maintained up to set pressure with a tightness that is far superior to the conventional standard. This feature is achieved by valve seat 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 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 | 443 / 17.44 | 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 |
Seleção do material do corpo
| Design | A | C | D |
| Housing | Aluminium | Stainless Steel | Low Temperature Carbon Steel |
| Valve seat | Stainless Steel | Stainless Steel | Stainless Steel |
| Protective grating | Stainless Steel | Stainless Steel | Stainless Steel |
| Sealing | PTFE | PTFE | PTFE |
Seleção do material do disco da válvula de vácuo
| Design | C | D | E | F |
| vacuum range [mbar] [inch W.C.] | -2.6 up to -4.4 -1.4 up to -1.76 | -4.4 up to -7.6 -1.76 up to 3.04 | -7.6 up to -13.2 -3.04 up to -5.28 | -13.2 up to -25 -5.28 up to -10 |
| Max. Back pressure [mbar] [inch W.C.] | 245 98 | 1690 676 | 580 232 | 2000 800 |
| 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 |
Tipo de conexão flangeada
| EN 1092-1; Form B1 |
| ASME B16.5 CL 150 R.F. |
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:
Válvula de vácuo na versão básica | VN-VL-L |
Outros dispositivos especiais sob solicitação
Ajustes de pressão
| Vácuo: | -2.7 mbar | -70 mbar | |
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.
