DV/ZT
Pressure and Vacuum Relief Valve, In-Line
Features
Tecnología del 10%
para un aumento mínimo de presión hasta alcanzar la apertura completa
Extrema estanqueidad
Lo que se traduce en las menores pérdidas posibles de producto y en una reducción de la contaminación ambiental
Mantenimiento óptimo de la presión
Basado en la tecnología del 10 %, la presión de tarado está muy próxima a la presión de apertura para un mantenimiento óptimo de la presión en el sistema, en comparación con la tecnología convencional del 40 % o del 100 %
Alta capacidad volumétrica
Reduce costes mediante el uso de válvulas más pequeñas
Se usa en zonas con riesgo de explosión
Puede utilizarse en zonas con riesgo de explosión
Diseño de cuerpo robusto
(PN 10 & 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. Typically, the valve is installed in the in-breathing and out-breathing lines of tanks, vessels and process equipment to protect against unallowable overpressure 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 is one size smaller than the upper valve pallet.
Full Lift Technology
The device 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 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 (2), in conjunction with high quality FEP diaphragm. 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.
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
Dimensiones
To select the nominal size (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 |
Dimensiones en mm / pulgadas
Larger sizes upon request
Dimensions for pressure and vacuum relief valve with heating jacket upon request
Selección de materiales para la vivienda
| Design | A | B |
| Housing | Steel | Stainless Steel |
| Heating jacket (DV / ZT-H-...) | Steel | Stainless Steel |
| Valve seat | Stainless Steel | Stainless Steel |
| Gasket | PTFE | PTFE |
Option: Housing with ECTFE-lining
Special materials upon request
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 |
Special materials upon request
For higher set pressure refer to type DV/ZT-F.
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 |
Special materials and lower set vacuum upon request
Tipo de bridas de conexión
| EN 1092-1; Form B1 |
| ASME B16.5 CL 150 R.F. |
other types upon request
Diagrama de flujo volumétrico
Los diagramas de flujo volumétrico han sido determinados con un banco de pruebas de caudal calibrado y certifi - cado por TÜV. El flujo volumétrico V. en [m³/h] y el CFH se refi eren a las condiciones estándar de referencia de aire según ISO 6358 (20°C, 1bar). La conversión a otras densidades y temperaturas están referidas en el Vol. 1: “Fundamentos Técnicos”.
Detail X
Detail X
Tank connection; Other arrangement of the tank connection upon request.