DV/ZW
Válvula de alívio de pressão e vácuo para tubulação
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 and Vacuum Relief Valve with Flange Connection for a Vent Line
The 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 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
Vent header
Piping system that collects and delivers the relief gases to the vent stack.
). 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. 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 losses.
Product Data and Features
Tabela de dimensões
Para selecionar o diâmetro nominal (DN), veja os diagramas de vazão nas páginas seguintes
| DN | 40 / 1½" | 50 / 2" | 80 / 3" | 100 / 4" | 150 / 6" |
| a | 280 | 280 | 340 | 390 | 520 |
| b | 230 | 230 | 240 | 290 | 330 |
| c | 85 | 85 | 125 | 140 | 185 |
| d | 210 | 210 | 280 | 310 | 390 |
Dimensões em mm
DN maiores sob solicitação
Dimensões para a válvula de pressão e vácuo para tubulação com camisa de aquecimento sob solicitação
Seleção do material do corpo
| Execução | A | B |
| Corpo | Aço | Aço inoxidável |
| Camisa de aquecimento (DV / ZW-H-...) | Aço | Aço inoxidável |
| Sede de válvula | Aço inoxidável | Aço inoxidável |
| Vedação | PTFE | PTFE |
Os corpos também podem ser fornecidos com revestimento de ECTFE
Materiais especiais sob solicitação
Seleção do material do disco da válvula de pressão
| Execução | A | B | C | D |
| Faixa de pressão [mbar] | +2,0 até +3,5 | >+3,5 até +14 | >+14 até +60 | >+14 até +60 |
| Disco da válvula | Alumínio | Aço inoxidável | Aço inoxidável | Aço inoxidável |
| Vedação | FEP | FEP | metálica | PTFE |
Materiais especiais sob solicitação
Em caso de ajustes de pressão mais altos, usar o tipo DV/ZW-F
Seleção do material do disco da válvula de vácuo
| Execução | A | B | C | D | E | F |
| Faixa de pressão [mbar] | -3,5 até -5,0 | <-5,0 até -14 | <-14 até -35 | <-35 até -50 | <-14 até -35 | <-35 até -50 |
| Disco da válvula | Alumínio | Aço inoxidável | Aço inoxidável | Aço inoxidável | Aço inoxidável | Aço inoxidável |
| Vedação | FEP | FEP | metálica | metálica | PTFE | PTFE |
Materiais especiais, bem como ajustes de vácuo mais baixos sob solicitação
Tipo de conexão flangeada
| EN 1092-1; Form B1 |
| ASME B16.5 CL 150 R.F. |
Outras conexões sob solicitação
Versão e especificação
Os discos da válvula são calibrados por peso. Pressões de ajuste mais altas são estabelecidas no lado da sobrepressão com calibração por mola (tipo DV/ZW-F).Estão disponíveis duas versões:
Válvula de pressão e vácuo para tubulação na versão básicaDV/ZW - –
Válvula de pressão e vácuo para tubulação com camisa de aquecimentoDV/ZW - H
Outros dispositivos especiais sob solicitação
Geralmente deve-se observar a contrapressão nas válvulas de tubulação, que tem influência na pressão de ajuste e no comportamento de abertura. Para casos especiais (p. ex., operação de carga parcial), a válvula também pode ser fornecida com Disco convencional (comportamento proporcional).
Ajustes de pressão
| Pressão: | +2.0 mbar | +60 mbar |
| +0.8 inch W.C. | +24 inch W.C. | |
| Vácuo: | -3.5 mbar | -50 mbar |
| -1.4 inch W.C. | -20 inch W.C. |
Em caso de ajustes de pressão mais altos, usar o tipo DV/ZW-F.
Ajustes de vácuo mais baixos sob solicitação
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.
Detalhe X
Detalhe X
conexão do tanque
alívio de vácuo
alívio de pressão
Applications