D/PA(L)
Pressure or Vacuum Relief Valve with pipe-away connection
Features
Function and Description
Combined Pressure and Vacuum Relief Valve
The D/PA(L) Type PROTEGO® valve is a highly developed pressure/vacuum relief valve 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. with excellent flow performance. 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 the set vacuum Set vacuum Internal negative gauge pressure at which a vacuum valve first opens. . The product Product Includes equipment, protective systems, devices, components and combinations of these. vapors can be released through a collective line connected to the line flange on the pressure Pressure (gauge pressure) Pressure for which the value is equal to the algebraic difference between the absolute pressure and the atmospheric pressure. side. Backflow is not possible, i.e. the valve can be used as an overflow valve or backflow protection.
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 Vacuum Vacuum is the pressure in an enclosed space that is lower than the ambient pressure. ( MAWP Maximum allowable working pressure (MAWP) Maximum gauge pressure permissible at the top of a completed vessel in its normal operating position at the designated coincident temperature specified for that pressure. or MAWV) of the tank and still safely vent the required mass flow. The opening characteristic is the same for pressure and vacuum relief.
Advanced Manufacturing Technology
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 superior to the conventional standard. This feature is valve seats made of high quality stainless steel and achieved by valve seats made of high quality stainless steel and with precisely 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 substances. After the excess pressure is released or the vacuum is balanced, the valve reseats and provides a tight seal. The optimized fluid dynamic design of the valve body and valve pallet Valve pallet Valve pallet is the generic term for the assembly that rests on the valve seat. 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 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), use the flow capacity charts on the following pages
| D/PA | |||||||
| DN 1 | 50 / 2" | 80 / 3" | 100 / 4" | 150 / 6" | 200 / 8" | 250 / 10" | 300 / 12" |
| DN 2 | 50 / 2" | 80 / 3" | 100 / 4" | 150 / 6" | 200 / 8" | 250 / 10" | 300 / 12" |
| a | 165 / 6.50 | 192 / 7.56 | 240 / 9.45 | 350 / 13.78 | 390 / 15.35 | 460 / 18.11 | 460 / 18.11 |
| b | 331 / 13.03 | 402 / 15.83 | 472 / 18.58 | 565 / 22.24 | 682 / 26.85 | 760 / 29.92 | 760 / 29.92 |
| c | 150 / 5.91 | 180 / 7.09 | 200 / 7.87 | 250 / 9.84 | 300 / 11.81 | 305 / 12.01 | 305 / 12.01 |
| d | 180 / 7.09 | 215 / 8.46 | 255 / 10.04 | 300 / 11.81 | 387 / 15.24 | 440 / 17.32 | 467 / 18.39 |
| D/PAL | |||||||
| DN 1 | 50 / 2" | 80 / 3" | 100 / 4" | 150 / 6" | 200 / 8" | 250 / 10" | 300 / 12" |
| DN 2 | 80 / 3" | 100 / 4" | 150 / 6" | 200 / 8" | 250 / 10" | 300 / 12" | 350 / 14" |
| a | 165 / 6.50 | 192 / 7.56 | 240 / 9.45 | 350 / 13.78 | 390 / 15.35 | 460 / 18.11 | 460 / 18.11 |
| b | 342 / 13.46 | 402 / 15.83 | 472 / 18.58 | 565 / 22.24 | 682 / 26.85 | 760 / 29.92 | 770 / 30.31 |
| c | 140 / 5.51 | 143 / 5.63 | 165 / 6.50 | 216 / 8.50 | 267 / 10.51 | 305 / 12.01 | 305 / 12.01 |
| d | 195 / 7.68 | 223 / 8.78 | 280 / 11.02 | 327 / 12.87 | 412 / 16.22 | 467 / 18.39 | 488 / 19.21 |
Dimensions in mm / inches
Dimensions of pressure or vacuum relief valves with heating jacket upon request
Material selection for housing
| Design | C DN50/2”-80/3” | A DN100/4”-300/12” | D/B DN50/2”-300/12” |
| 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. | Stainless Steel | Steel | Stainless Steel |
| Housing attachment Housing attachment A housing attachment is an assembly, which is used for holding flame arresters or for diverting the flow direction. | Steel | Steel | Stainless Steel |
| Heating jacket(D/PA(L)-H-...) | Stainless Steel/Steel | Stahl | 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 | Stainless Steel |
| Gasket | PTFE | 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 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± 60 ±14 up to ±24 | ±14 up to ±35 ±5.6 up to ±14 | ±35 up to ±60 ±14 up to ±24 |
| 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 upon request
For higher set pressure or vacuum, refer to type D/PA(L)-F
Flange connection type
| EN 1092-1; Form B1 |
| ASME B16.5 CL 150 R.F. |
Other types upon request
Design Types and Specifications
The valve pallets are weight-loaded. Higher pressures can be achieved upon request with a special spring Spring A spring is a spiral of wire which returns to its original shape after it is pressed or pulled. -loaded design. Choose the model (L) if the discharge nozzle has a nominal diameter that is greater than the nominal diameter of the tank filler neck.There are four different designs:
Additional special devices available upon request
Settings
| Pressure or vacuum: | ±2.0 mbar | ±60 mbar |
| ±0.8 inch W.C. | ±24 inch W.C. |
Higher or lower settings upon request.For higher set pressure or vacuum refer to type D/PA(L)-F
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”.
