VD/TS
Pressure/Vacuum Relief Valve atmospheric deflagration-proof
- 10% technology for minimum pressure increase up to full lift
- extreme tightness, resulting in lowest possible product losses and reduced environmental pollution
- due to 10% technology, set pressure is close to opening pressure for optimum pressure maintenance in the system as compared to conventional 40% or 100% technology
- valve pallet is guided inside the housing to protect against harsh weather conditions
- can be used as a protective system in areas with potentially explosive atmospheres in accordance with ATEX
- FLAMEFILTER® provides protection against atmospheric deflagrations
- integrated flame arrester unit saves space and reduces costs
- PROTEGO® flame arrester unit is protected from clogging and sticky products caused by product vapors
- minimum pressure loss of the PROTEGO® flame arrester unit
- high flow capacity
- maintenance-friendly design
- sturdy housing design
- best possible technology for API tanks
Function and Description
The atmospheric deflagration-proof VD/TS type PROTEGO® valve is a highly developed combined pressure/vacuum relief valve for high flow capacities with an integrated flame arrester unit. It is primarily used as a device for flame transmission proof in-breathing and out-breathing on tanks, containers, and process equipment. The valve offers reliable protection against overpressure and vacuum, prevents the in-breathing of air and product losses almost up to the set pressure, and protects against atmospheric deflagration. The PROTEGO® flame arrester unit is designed to achieve minimum pressure drop with maximum safety. The PROTEGO® VD/TS device is available for substances from explosion groups IIA to IIB3 (NEC group D to C MESG ≥ 0.65 mm).
When the set pressure is reached, the valve starts to open and reaches full lift within 10% overpressure. This unique 10% technology enables a set pressure that is only 10% below the maximum allowable working pressure (MAWP) or maximum allowable working vacuum (MAWV) of the tank. After years of development, this typical opening characteristic of a safety relief valve is now also available for the low pressure range.
The tank pressure is maintained up to the set pressure with a tightness that is above the normal standards due to our state-of-the-art manufacturing technology. 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 them from sticking when sticky substances are used and to enable the use of corrosive fluids. After the overpressure is released, the valve re-seats and provides a tight seal.
If the set pressure is exceeded, explosive gas/product vapor/air mixtures are released into the atmosphere. If this mixture ignites, the integrated PROTEGO® flame arrester unit (3) prevents flame transmission into the tank.
The standard design is tested at an operating temperature up to +60°C / 140°F and meets the requirements of European tank design standard EN 14015 (Appendix L) and ISO 28300 (API 2000). In addition, numerous versions for higher operating temperature are available.
Type-approved in accordance with the current ATEX Directive and ISO 16852, as well as other international standards.
Dimensions
To select the nominal size (DN), please use the flow capacity charts on the following pages
| DN | 50 / 2" | 80 / 3" | 100 / 4" | 125 / 5" | 150 / 6" | 200 / 8" | 250 / 10" | 300 / 12" |
| a | 340 / 13.39 | 430 / 16.93 | 490 / 19.29 | 610 / 24.02 | 610 / 24.02 | 705 / 27.76 | 765 / 30.12 | 930 / 36.61 |
| b | 210 / 8.27 | 280 / 11.02 | 310 / 12.20 | 390 / 15.35 | 390 / 15.35 | 445 / 17.52 | 505 / 19.88 | 560 / 22.05 |
| c | 206 / 8.11 | 277 / 10.91 | 347 / 13.66 | 427 / 16.81 | 427 / 16.81 | 534 / 21.02 | 604 / 23.78 | 823 / 32.40 |
| d | 125 / 4.92 | 150 / 5.91 | 180 / 7.09 | 230 / 9.06 | 230 / 9.06 | 270 / 10.63 | 310 / 12.20 | 445 / 17.52 |
Material selection for housing
| Design | A | C | D | E | ||
| Housing | Aluminium | Steel | Stainless Steel | Hastelloy | ||
| Valve seats | Stainless Steel | Stainless Steel | Stainless Steel | Hastelloy | ||
| Gasket | PTFE | PTFE | PTFE | PTFE | ||
| Weather hood |
|
| Stainless Steel | Hastelloy | ||
| Flame arrester unit | A | A | A | C | ||
| Pressure valve pallet | A-F | A-F | A-F | G-I | ||
| Vacuum valve pallet | A-E | A-E | A-E | F-H |
Material combinations of flame arrester unit
| Design | A | C |
| FLAMEFILTER® cage | Stainless Steel | Hastelloy |
| FLAMEFILTER® | Stainless Steel | Hastelloy |
Material selection for pressure valve pallet
| Design | A | B | C | D | E | F | G | H | I |
| Pressure range [mbar] [inch W.C.] | +3.5 up to +5,0 +1.4 up to +2.0 | >+5.0 up to +14 >+2.0 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 | +3.5 up to +5,0 +1.4 up to +2.0 | >+5.0 up to +14 >+2.0 up to +5.6 | >+14 up to +35 >+5.6 up to +14 |
| Valve pallet | Aluminium | Stainless Steel | Stainless Steel | Stainless Steel | Stainless Steel | Stainless Steel | Titanium | Hastelloy | Hastelloy |
| Sealing | FEP | FEP | Metal to Metal | Metal to Metal | PTFE | PTFE | FEP | FEP | Metal to Metal |
| Weight | Stainless Steel | Stainless Steel | Stainless Steel | Lead | Stainless Steel | Lead | Hastelloy | Hastelloy | Hastelloy |
Material selection for vacuum valve pallet
| Design | A | B | C | E | F | G | H |
| Vacuum 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 -25 <-5.6 up to -10 | <-14 up to -25 <-5.6 up to -10 | -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 -25 <-5.6 up to -10 |
| Valve pallet | Aluminium | Stainless Steel | Stainless Steel | Stainless Steel | Titanium | Hastelloy | Hastelloy |
| Sealing | FEP | FEP | Metal to Metal | PTFE | FEP | FEP | Metal to Metal |
| Weight | Stainless Steel | Stainless Steel | Stainless Steel | Stainless Steel | Hastelloy | Hastelloy | Hastelloy |
Selection of explosion group
| MESG | Expl. Gr. (IEC / CEN) | Gas Group (NEC) |
| ≥ 0,65 mm | IIB3 | C |
Specification of max. operating temperature
| ≤ 60°C / 140°F | Tmaximum allowable operating temperature in °C |
| - | Designation |
Flange connection type
| EN 1092-1; Form B1 |
| ASME B16.5 CL 150 R.F. |
Design Types and Specifications
Any combination of vacuum and pressure levels can be set for the valve
The valve discs are weight-loaded.
Pressure/vacuum relief valve, basic design | VD/TS |
Additional special devices available upon request
Settings
| Pressure: | +3.5 mbar | +50 mbar | |
| +1.4 inch W.C. | +20 inch W.C. | ||
| Vacuum: | -2.0 mbar | -25 mbar | |
| -0.8 inch W.C. | -10 inch W.C. |
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”.
