Caractéristiques
Fonction et description
Highly Developed Vacuum Relief Valve
The VN-VL-L Type PROTEGO® valve is a highly developed vacuum relief valve Vacuum relief valve 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 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 relieving vacuum Vacuum 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 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. .
Full Lift Technology
The device will start to open as soon as the set pressure is reached and only requires 10% overpressure Overpressure Overpressure refers to an increase in pressure in a system or vessel above the normal operating pressure. to reach full lift Lift 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 Pressure (gauge pressure) Pressure for which the value is equal to the algebraic difference between the absolute pressure and the atmospheric 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 Tank pressure 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 Valve seat 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 Seal 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.
Dimensions
| 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 |
Dimensions in mm / inches
Dimensions for vacuum relief valve with heating jacket upon request
Material selection for housing
| 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 Housing A housing is a solid shell, which surrounds a content, either protecting the content from external influences, or protecting the environment from the content. | Aluminium | Steel | Stainless Steel | Steel | Stainless Steel |
| Valve seat | Stainless Steel | Stainless Steel | Stainless Steel | Stainless Steel | Stainless Steel |
| Protective grating Protective grating Protective grating is used as a barrier against humans, animals, or debris, while still allowing flow of gases | Stainless Steel | Stainless Steel | Stainless Steel | Stainless Steel | Stainless Steel |
| Sealing | PTFE | PTFE | PTFE | PTFE | PTFE |
Option: Housing with ECTFE- lining Lining Protective plastic lining with a defined minimum/maximum thickness to protect against aggressive mixtures (e.g., acid).
Special materials upon request
Material selection for vacuum valve pallet
| 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
Back pressure
The back pressure is the sum of built-up back pressure and superimposed back pressure.
(up to 60°C) [mbar] [inch W.C.] | 390 156 | 2700 1080 | 930 372 | 6400 2560 |
| Valve pallet Valve pallet Valve pallet is the generic term for the assembly that rests on the valve seat. | Aluminium, thin | Aluminium, thick | Stainless Steel, thin | Stainless Steel, thick |
| Sealing | Metal to Metal | Metal to Metal | Metal to Metal | Metal to Metal |
Special materials and higher vacuum settings upon request
Flange connection type
| EN 1092-1; Form B1 |
| ASME B16.5 CL 150 R.F. |
other types upon request
Design Types and Specifications
The valve pallet is weight-loaded.Additional special devices available upon request.
Settings
| Vacuum: | -2.7 mbar | -70 mbar |
Higher vacuum settings upon request.
Flow Capacity Chart
The flow capacity charts have been determined with a calibrated and TÜV certified flow capacity test rig. Volume flow V in (m³/h) and CFH refer to the standard reference conditions of air ISO 6358 (20°C, 1bar). For conversion to other densities and temperatures refer to Sec. 1: “Technical Fundamentals”.
