Features
10% Technology
for Minimum Pressure Increase up to Full Lift
Extreme Tightness
Resulting in Lowest Possible Product Losses and Reduced Environmental Pollution
Optimum Pressure Maintenance
Based on 10% Technology, Set Pressure Is Close to Opening Pressure for Optimum Pressure Maintenance in the System as Compared to Conventional 40% or 100% Technology
High Flow Capacity
Reduces Costs Through the Use of Smaller Valves
Used in Explosion Hazardous Areas
can Be Used in Explosion Hazardous Areas
Sturdy Housing Design
(PN 10 and PN 16)
Function and Description
Pressure and Vacuum Relief Valve with Flange Connection for a Vent Line
The
Pressure/vacuum relief valve
Pressure/vacuum relief valve is an umbrella term that includes pressure or vacuum relief valve as well as pressure and vacuum relief valve.
PROTEGO® In-Line Valve DV/ZW is a state-of-the-art
Pressure and Vacuum Relief Valve
Pressure and vacuum relief valve
A pressure and vacuum relief valve is a pressure equalization valve for impermissible pressure and vacuum in a closed system.
with separate flange connections for use in a vent line. Typically, the valve is installed in the in-breathing and out-breathing lines of tanks, vessels, and process
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.
to protect against unallowable
overpressure
Overpressure
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
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.
and prevents air intake almost up to
set vacuum
Set vacuum
Internal negative gauge pressure at which a vacuum valve first opens.
. It is designed in a way that if the set pressure is exceeded, the vapors are released into an exhaust pipe (e.g., Vent Header). If the set vacuum is exceeded, atmospheric air is pulled into the system. For structural reasons, the
vacuum
Vacuum
Vacuum is the pressure in an enclosed space that is lower than the ambient pressure.
valve pallet
Valve pallet
Valve pallet is the generic term for the assembly that rests on the valve seat.
is one size smaller than the pressure valve pallet.
Full Lift Technology
The
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.
will start to open as soon as the set pressure is reached and only requires 10% overpressure to 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 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 (MAWP or MAWV) of the tank and still safely vent the required mass flow. The opening characteristic of the pressure and vacuum side is basically the same. However, the in-breathing will start as soon as the differential pressure between the atmospheric pressure and the tank is greater than the set pressure of the vacuum valve pallet. 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 above the conventional standard.
Optimized Valve Design for Maximum Performance
This feature is ensured by valve seats made of high quality stainless steel and with individually lapped valve pallets (1), or with an air cushion
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.
(2), in conjunction with high quality FEP
diaphragm
Diaphragm
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 fluids. After the over pressure is released or the vacuum is balanced, the valve re-seats and provides a tight seal.
The optimized fluid dynamic design of the valve body and valve pallet is a result of many years of research, resulting in stable operation of the valve pallet, optimized performance, and reduced
product
Product
Includes equipment, protective systems, devices, components and combinations of these.
losses.
Product Data
Dimensions
To select the nominal size Nominal size 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), please use the flow capacity charts on the following pages
| DN | 40 / 1½“ | 50 / 2" | 80 / 3" | 100 / 4" | 150 / 6" |
| a | 280 / 11.02 | 280 / 11.02 | 340 / 13.39 | 390 / 15.35 | 520 / 20.47 |
| b | 230 / 9.06 | 230 / 9.06 | 240 / 9.45 | 290 / 11.42 | 330 / 12.99 |
| c | 85 / 3.35 | 85 / 3.35 | 125 / 4.92 | 140 / 5.51 | 185 / 7.28 |
| d | 210 / 8.27 | 210 / 8.27 | 280 / 11.02 | 310 / 12.20 | 390 / 15.35 |
Dimensions in mm / inches
Larger sizes upon request
Dimensions for pressure and vacuum relief valve with heating jacket upon request
Material selection for housing
| Design | A | B |
| 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. | Steel | Stainless Steel |
| Heating jacket (DV / ZW-H-...) | Steel | Stainless Steel |
| Valve seat Valve seat The valve seat is a component on which the valve pallet rests when the valve is closed. | Stainless Steel | Stainless Steel |
| Gasket | 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 pressure valve pallet
| Design | A | B | C | D |
| 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 +60 >+5.6 up to +24 | >+14 up to +60 >+5.6 up to +24 |
| Valve pallet | Aluminium | Stainless Steel | Stainless Steel | Stainless Steel |
| Sealing | FEP | FEP | Metal to Metal | PTFE |
Special materials upon request
For higher set pressures refer to type DV/ZW-F.
Material selection for vacuum valve pallet
| Design | A | B | C | D | E | F |
| Pressure range [mbar] [inch W.C.] | -3.5up to -5.0 -1.4up to -2.0 | <-5.0 up to -14 <-2.0up to -5.6 | <-14up to -35 <-5.6 up to -14 | <-35 up to -50 <-14 up to -20 | <-14 up to -35 <-5.6 up to -14 | <-35 up to -50 <-14 up to -20 |
| 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 and lower set vacuum upon request.
Flange connection type
| EN 1092-1; Form B1 |
| ASME B16.5 CL 150 R.F. |
other types 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
Detail X
Tank connection
Inbreathing
Outbreathing
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