Caractéristiques
Fonction et description
Pressure and Vacuum Relief Valve with Separate Connections for Pressure and Vacuum Breathing
The PROTEGO® In-Line Valve DV/ZU is a state-of-the-art Pressure and Vacuum Relief Valve Soupape de surpression et dépression 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 pressure and vacuum Dépression Vacuum is the pressure in an enclosed space that is lower than the ambient pressure. breathing. Typically, the valve is installed in the in-breathing and out-breathing lines of tanks, vessels, and process equipment to protect against unallowable overpressure Surpression 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 pressure and prevents air intake almost up to set vacuum Set vacuum Internal negative gauge pressure at which a vacuum valve first opens. . The valve is designed in a way that if the set pressure Pression de réponse Set pressure is the gauge pressure at the device inlet at which the relief device is set to start opening under service conditions. 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 valve pallet Clapet Valve pallet is the generic term for the assembly that rests on the valve seat. is one size smaller than the pressure valve pallet. Due to the spring Ressort A spring is a spiral of wire which returns to its original shape after it is pressed or pulled. -loaded design, higher set pressures can be achieved.
Full Lift Technology
The device Appareil 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 Course 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 connected in-breathing line and the tank is greater than the set pressure of the vacuum valve pallet.
Advanced Manufacturing Technology
Due to our highly developed manufacturing technology, the tank pressure Pression de la cuve Tank pressure is the pressure within a tank. is maintained up to set pressure with a tightness that is far above the conventional standard. This feature is ensured by valve seats made of high quality stainless steel and with individually lapped valve pallets (1), (3), or with an air cushion seal Joint 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 Membrane A diaphragm is a thin layer of material, which has a large surface area. and a sturdy housing Corps A housing is a solid shell, which surrounds a content, either protecting the content from external influences, or protecting the environment from the content. design. 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.
Dimensions
To select the nominal size Diamètre nominal 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 | 210 / 8.27 | 210 / 8.27 | 280 / 11.02 | 310 / 12.20 | 390 / 15.35 |
| c | 165 / 6.50 | 165 / 6.50 | 200 / 7.87 | 240 / 9.45 | 300 / 11.81 |
| d | 565 / 22.24 | 565 / 22.24 | 675 / 26.57 | 805 / 31.69 | 1070 / 42.13 |
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 | Steel | Stainless Steel |
| Heating jacket (DV / ZU-F-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 pressure valve pallet
| Design | A |
| Pressure range [mbar] [inch W.C.] | >+60 up to +500 >+24 up to +200 |
| Valve pallet | Stainless Steel |
| Sealing | Metal to Metal |
| Spring | Stainless Steel |
Special materials upon request
For lower set pressure use type DV/ZU. Higher set pressure and lower set vacuum upon request.
Material selection for vacuum valve pallet
| Design | A* | B* | C | D |
| Pressure range [mbar] [inch W.C.] | -3,5 up to -5,0 -1.4 up to -2.0 | <-5,0 up to -14 <-2.0up to -5.6 | <-14up to -35 <-5.6up to -14 | <-35 up to -50 <-14up to -20 |
| Valve pallet | Aluminium | Stainless Steel | Stainless Steel | Stainless Steel |
| Sealing | FEP | FEP | Metal to Metal | Metal to Metal |
*by set pressure up to +150 mbar / +60 inch W.C.
Special materials and lower set vacuum upon request.
Flange connection type
| EN 1092-1; Form B1 |
| ASME B16.5 CL 150 R.F. |
other connections upon request
Design Types and Specifications
The pressure valve pallet is spring loaded, the vacuum valve pallet weight loaded. Lower set pressures for the pressure side are achieved through weight loaded type DV/ZU.Two different designs are available:
Additional special devices available upon request
Within piping systems the influence of backpressure has to be considered in deciding the set pressure and opening characteristics. For special design solutions (e.g. partial load operation) the valve can be supplied with standard valve pallets (with proportional opening function).
Settings
| Pressure: | +60 mbar | +500 mbar |
| +24 inch W.C. | +200 inch W.C. | |
| Vacuum: | -3.5 mbar | -50 mbar |
| -1.4 inch W.C. | -20 inch W.C. | |
| Vacuum: | -3.5 mbar | -14 mbar |
| -1.4 inch W.C. | -5.6 inch W.C. |
For lower set pressure refer to type DV/ZU.
Higher set pressure and lower set vacuum 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”.
