VD/SV

VD/SV

Pressure and Vacuum Relief Valve

Function and Description

The VD/SV type PROTEGO® valve is a highly developed pressure and vacuum relief valve with excellent flow performance. Typically the valve is installed in the in- and outbreathing lines of tanks, vessels and process apparatus to protect against unallowable high and low pressure. The valve prevents emission losses almost up to the set pressure and prevents air intake almost up to set vacuum.

The device will start to open as soon as the set pressure is reached and only requires 10% overpressure to full lift. Continuous investments into 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 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 is the same for presssure and vacuum relief.

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 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 fluids. After the excess pressure is discharged or the vacuum is compensated, 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 work, which allow a stable operation of the valve pallet and optimized performance resulting in reduction of product losses.

Features and Advantages

  • “full lift type” technology valve utilizes only 10% overpressure to reach full lift
  • extreme tightness and hence least possible product losses and reduced environmental pollution
  • the set pressure is close to the opening pressure which results in best possible pressure management of the system
  • very high flow capacity
  • the valve pallet is guided within the housing to protect against harsh weather conditions
  • can be used in areas subject to explosion hazards
  • self draining
  • maintenance friendly design
  • best technology for API-tanks

Dimensions

To select the nominal size (DN), use the flow capacity chart on the following page

DN40 / 1½" 50 / 2" 80 / 3" 100 / 4" 150 / 6" 200 / 8" 250 / 10"300 / 12
a396 / 15.59396 / 15.59497 / 19.57519 / 20.43654 / 25.75757 / 29.80802 / 31.57802 / 31.57
b355 / 13.98355 / 13.98448 / 17.64548 / 21.57788 / 31.02900 / 35.431030 / 40.551030 / 40.55
c200 / 7.87200 / 7.87295 / 11.61295 / 11.61465 / 18.31550 / 21.65650 / 25.59650 / 25.59
DN40 / 1½" 50 / 2" 80 / 3" 100 / 4" 150 / 6" 200 / 8" 250 / 10"300 / 12
a396 / 15.59396 / 15.59497 / 19.57519 / 20.43654 / 25.75757 / 29.80802 / 31.57802 / 31.57
b355 / 13.98355 / 13.98448 / 17.64548 / 21.57788 / 31.02900 / 35.431030 / 40.551030 / 40.55
c200 / 7.87200 / 7.87295 / 11.61295 / 11.61465 / 18.31550 / 21.65650 / 25.59650 / 25.59

Dimensions in mm / inches

Dimensions of pressure and vacuum relief valves with heating jacket upon request

VD/SV

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Material selection for housing

Design  ABC
HousingAluminiumSteelStainless Steel
Heating jacket (VD / SV-H-...)SteelStainless Steel
Valve seatStainless SteelStainless SteelStainless Steel
SealingPTFEPTFEPTFE
Weather hoodStainless SteelStainless SteelStainless Steel
Design  ABC
HousingAluminiumSteelStainless Steel
Heating jacket (VD / SV-H-...)SteelStainless Steel
Valve seatStainless SteelStainless SteelStainless Steel
SealingPTFEPTFEPTFE
Weather hoodStainless SteelStainless SteelStainless Steel

Option: Housing with ECTFE-lining

Special materials upon request

Material selection for pressure valve pallet

Design ABCDEF
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 palletAluminiumStainless SteelStainless SteelStainless SteelStainless SteelStainless Steel
SealingFEPFEPMetal to MetalMetal to MetalPTFEPTFE
Design ABCDEF
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 palletAluminiumStainless SteelStainless SteelStainless SteelStainless SteelStainless Steel
SealingFEPFEPMetal to MetalMetal to MetalPTFEPTFE

Special material as well as higher set pressure upon request

Material selection for vacuum valve pallet

Design ABCDEF
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
<-14 up to -35
<-5.6up to -14
<-35 up to -60
<-14 up to -24
<-35 up to -60
<-14 up to -24
Valve palletAluminiumStainless SteelStainless SteelStainless SteelStainless SteelStainless Steel
SealingFEPFEPMetal to MetalPTFEMetal to MetalPTFE
Design ABCDEF
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
<-14 up to -35
<-5.6up to -14
<-35 up to -60
<-14 up to -24
<-35 up to -60
<-14 up to -24
Valve palletAluminiumStainless SteelStainless SteelStainless SteelStainless SteelStainless Steel
SealingFEPFEPMetal to MetalPTFEMetal to MetalPTFE

Special material as well as higher vacuum upon request

VD/SV

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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

The valve pallets are weight-loaded. Higher pressures can be achieved upon request with a special spring-loaded design.
There are two different designs:

Pressure/vacuum relief valve in basic design

VD/SV- –

Pressure/vacuum relief valve with heating jacket

VD/SV- H

Pressure/vacuum relief valve in basic design

VD/SV- –

Pressure/vacuum relief valve with heating jacket

VD/SV- H

Additional special devices available upon request.
Any combination of vacuum and pressure levels can be set for the valve. When the difference between the pressure and vacuum exceeds 150 mbar / 60.2 inch W.C., special valve pallets are used.

Settings

Pressure:

+2.0 mbar

+60 mbar

+0.8 inch W.C.

+24 inch W.C.

Vacuum:

-2.0 mbar

-60 mbar

-0.8 inch W.C.

-24 inch W.C.

Higher or lower settings upon request.

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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”.

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VD/SV

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