VD/SV-AD and VD/SV-ADL

VD/SV-AD and VD/SV-ADL

Pressure/Vacuum Relief Valve

atmospheric deflagration-proof

Function and Description

The deflagration proof VD/SV-AD(L) 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 safety device for flame-transmission-proof in- and outbreathing in tanks, containers and process engineering apparatus. The valve offers reliable protection against excess pressure and vacuum, preventing outbreathing of product vapour and inbreathing of air almost up to the set pressure and also protects against atmospheric deflagration. The PROTEGO® flame arrester unit is designed to achieve minimum pressure drop with maximum safety. The deflagration-proof PROTEGO® VD/SV-AD(L) valve 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 far superior to the conventional standard due to our state of the art manufacturing technology. This feature is ensured by the 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 in- and outbreathing is completed the valve reseats and provides a tight seal.

If the set pressure is exceeded, explosive gas/product-vapour air mixtures are released to the atmosphere. If this mixture ignites, the integrated PROTEGO® flame arrester unit (3) prevents flame transmission resulting from atmospheric deflagration into the tank. The vacuum side is also protected against atmospheric deflagration.

The valve can be used up to an operating temperature of +60°C / 140°F and meets the requirements of European tank design standard EN 14015 – Appendix L and ISO 28300 (API 2000).

Type-approved in accordance with the current ATEX Directive and EN ISO 16852 as well as other international standards.

Features and Advantages

  • requires only 10% overpressure to full lift
  • through 10% technology set pressures and vacuum closer to MAWP and MAWV can be reached which results in product loss reduction compared to conventional 40% and 100% overpressure technology vents (compare API 2000)
  • more design flexibility through higher reseating pressures; vents reseat when conventional vent is still discharging costly product or nitrogen
  • high performance seal reducing product loss below EPA’s 500ppm rule preventing environmental pollution
  • the valve disc is guided within the housing to protect against harsh weather conditions
  • can be used as protective system according ATEX in areas subject to explosion hazards
  • FLAMEFILTER® provides protection against atmospheric deflagration
  • FLAMEFILTER® integrated into the valve saves space, weight and reduces cost
  • FLAMEFILTER® protected from clogging through product vapour
  • FLAMEFILTER® has a low pressure drop
  • flame transmission proof condensate drain
  • maintenance friendly design
  • modular design enables individual FLAMEFILTER® and the valve pallet to be replaced
  • superior technology for API tanks with low MAWP and MAWV

Dimensions

To select the nominal size (DN), please use the flow capacity charts on the following pages

VD / SV-ADVD / SV-ADL
DN80 / 3"100 / 4"100 / 4"150 / 6"
a540 / 21.26565 / 22.24650 / 25.59760 / 29.92
b475 / 18.70575 / 22.64700 / 27.56855 / 33.66
c350 / 13.78350 / 13.78600 / 23.62600 / 23.62
VD / SV-ADVD / SV-ADL
DN80 / 3"100 / 4"100 / 4"150 / 6"
a540 / 21.26565 / 22.24650 / 25.59760 / 29.92
b475 / 18.70575 / 22.64700 / 27.56855 / 33.66
c350 / 13.78350 / 13.78600 / 23.62600 / 23.62

Dimensions in mm / inches

VD/SV-AD and VD/SV-ADL

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Material selection for housing

Design A B
HousingSteelStainless Steel
Valve saetsStainless SteelStainless Steel
Gasket
WS 3822
PTFE
Weather hoodStainless SteelStainless Steel
Flame arrester unitA, BB
Design A B
HousingSteelStainless Steel
Valve saetsStainless SteelStainless Steel
Gasket
WS 3822
PTFE
Weather hoodStainless SteelStainless Steel
Flame arrester unitA, BB

Option: Housing with ECTFE-lining

Special materials upon request

Material combinations of flame arrester unit

Ausführung AB
FLAMEFILTER® cageSteel
Stainless Steel
FLAMEFILTER®Stainless SteelStainless Steel
Ausführung AB
FLAMEFILTER® cageSteel
Stainless Steel
FLAMEFILTER®Stainless SteelStainless Steel

Special materials upon request

Material selection for pressure valve pallet

Design ABCD
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 +210
>+5.6 up to +84
>+35 up to +210
>+14 up to +84
Valve palletAluminiumStainless SteelStainless SteelStainless Steel
SealingFEPFEPMetal to MetalPTFE
Design ABCD
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 +210
>+5.6 up to +84
>+35 up to +210
>+14 up to +84
Valve palletAluminiumStainless SteelStainless SteelStainless Steel
SealingFEPFEPMetal to MetalPTFE

Special material as well as higher set pressure upon request

Material selection for vacuum valve pallet

Design ABCD
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 -35
<-5.6 up to -14
<-14 up to -35
<-5.6 up to -14
Valve palletAluminiumStainless SteelStainless SteelStainless Steel
SealingFEPFEPMetal to MetalPTFE
Design ABCD
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 -35
<-5.6 up to -14
<-14 up to -35
<-5.6 up to -14
Valve palletAluminiumStainless SteelStainless SteelStainless Steel
SealingFEPFEPMetal to MetalPTFE

Special material as well as higher set vacuum upon request

VD/SV-AD and VD/SV-ADL

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Selection of explosion group

MESGExpl. Gr. (IEC / CEN)Gas Group (NEC)
≥ 0,65 mmIIB3C
MESGExpl. Gr. (IEC / CEN)Gas Group (NEC)
≥ 0,65 mmIIB3C

Special approvals upon request

Flange connection type

EN 1092-1; Form B1
ASME B16.5; 150 lbs RFSF
EN 1092-1; Form B1
ASME B16.5; 150 lbs RFSF

other types upon request

Design Types and Specifications

Any combination of vacuum and pressure levels can be set for the valve
The valve discs are weight-loaded.
There are two different designs:

Pressure/vacuum relief valve with housing, standard design

VD/SV-AD

Pressure/vacuum relief valve with expanded housing

VD/SV-ADL

Pressure/vacuum relief valve with housing, standard design

VD/SV-AD

Pressure/vacuum relief valve with expanded housing

VD/SV-ADL

Additional special devices available upon request

Settings

Pressure:

+3.5 mbar

+35 mbar

+1.4 inch W.C.

+14 inch W.C.

Vacuum:

-2.0 mbar

-35 mbar

-0.8 inch W.C.

-14 inch W.C.

Higher and lower settings upon request

VD/SV-AD and VD/SV-ADL

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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). Conversion to other densities and temperatures refer to Vol. 1: “Technical Fundamentals”.

VD/SV-AD and VD/SV-ADL

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VD/SV-AD and VD/SV-ADL

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