DV/ZT
Flame arrester Device fitted to the opening of an enclosure, or to the connecting pipe work of a system of enclosures, and whose intended function is to allow flow but prevent the transmission of a flame. Pressure and Vacuum Vacuum Vacuum is the pressure in an enclosed space that is lower than the ambient pressure. Relief Valve, In-Line
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
Optimum Pressure Maintenance
based on
10% technology
,
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.
is 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 as compared to conventional 40% or 100% technology
High Flow Capacity
reduces costs through the use of smaller valves
Used in Explosion Hazardous Areas
Sturdy Housing Design
(PN 10 and PN 16)
Function and Description
Pressure or Backflow Protection in Venting or Exhaust Lines
The PROTEGO® in-line valve DV/ZT 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.
. 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 and provides protection from product entry into the system. For structural reasons, the lower
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 upper 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. 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.
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.
Custom Materials
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 overpressure is released or the vacuum is balanced, the valve re-seats and provides a tight seal.
Optimized Valve Design for Maximum Performance
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 losses.
Product Data and Features
Dimensions
Dimensions in mm / inches
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 chart on the following page
| 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 | 270 / 10.63 | 270 / 10.63 | 290 / 11.42 | 355 / 13.98 | 425 / 16.73 |
| c | 210 / 8.27 | 210 / 8.27 | 280 / 11.02 | 310 / 12.20 | 390 / 15.35 |
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 / ZT-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 |
Material selection for upper 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 |
Material selection for lower valve pallet
| Design | A | B | C | D | E | F |
| 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 ±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 |
Flange connection type
| EN 1092-1; Form B1 |
| ASME B16.5 CL 150 R.F. |
