D/PA(L)
Pressure or Vacuum Relief Valve with pipe-away connection
Caractéristiques
Fonction et description
Combined Pressure and Vacuum Relief Valve
The D/PA(L) Type PROTEGO® valve is a highly developed pressure/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 to protect against unallowable overpressure and underpressure. The valve prevents emission losses almost up to the set pressure and prevents air intake almost up to the set vacuum. The product vapors can be released through a collective line connected to the line flange on the 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 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 Maximal erlaubter Betriebsdruck (MAWP) Maximaler zulässiger Überdruck im oberen Bereich eines kompletten Behälters in normaler Betriebsstellung bei der genannten übereinstimmenden Temperatur, die für diesen Druck spezifiziert ist. 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 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 (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 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 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 (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 | Stainless Steel | Steel | Stainless Steel |
| Housing attachment | Steel | Steel | Stainless Steel |
| Heating jacket(D/PA(L)-H-...) | Stainless Steel/Steel | Stahl | Stainless Steel |
| Valve seat | Stainless Steel | Stainless Steel | Stainless Steel |
| Gasket | PTFE | PTFE | PTFE |
Option: Housing with ECTFE-lining
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-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”.
