VN-VU
Vacuum Relief Valve
Features
10% Technology
for minimum pressure increase up to full
lift
Lift
Lift is the actual travel of the valve pallet from the main valve out of the closed position.
Extreme Tightness
resulting in lowest possible
product
Product
Includes equipment, protective systems, devices, components and combinations of these.
losses and reduced environmental pollution
Optimal Pressure Maintenance
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.
close to opening pressure for optimum pressure
maintenance
Maintenance
Combination of all technical and administrative actions, including supervision actions, intended to maintain or restore a unit in working order.
in the system
Flow Capacity
optimized flow capacity
Guided Valve Pallet
valve pallet
Valve pallet
Valve pallet is the generic term for the assembly that rests on the valve seat.
is guided inside the
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.
to protect against harsh weather conditions
Used in Explosion Hazardous Areas
Condensate Drainage
automatic condensate drain
Function and Description
Highly Developed Vacuum Relief Valve
The VN-VU 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.
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. 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
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.
Product Data and Features
Dimensions
| DN | 400 / 16" |
| a | 690 / 27.17 |
| b | 470 / 18.50 |
| c | 750 / 29.53 |
| d | 435 / 17.13 |
| e | 1086 / 42.76 |
Dimensions in mm / inches
Dimensions for vacuum relief valve with heating jacket upon request
Material selection for housing
| Design | A | C | D |
| Housing | Aluminium | Stainless Steel | Low Temperature Carbon Steel |
| Valve seat | 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 |
| Sealing | 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.] | -2.6 up to -4.4 -1.04 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
Back pressure
The back pressure is the sum of built-up back pressure and superimposed 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 |
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.Vacuum valve in basic designVN-VU
Additional special devices available upon request.
Settings
| Vacuum: | -2.6 mbar | -25 mbar |
| -10 inch W.C. |
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”.
Detail X
Applications