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Vacuum Relief Valve

  • excellent tightness, resulting in lowest possible product losses and reduced environmental pollution
  • very high optimized flow capacity
  • valve pallet is guided inside the housing to protect against harsh weather conditions
  • can be used in explosion hazardous areas
  • automatic condensate drain
  • maintenance-friendly design
  • best technology for API tanks
  • suitable for use on cold storage tanks

Function and Description

The PROTEGO® V/SV-XXL valve is a highly developed optimized vacuum relief valve with excellent flow performance. It is primarily used as a device for relieving vacuum in tanks, containers, and process equipment.

When the set vacuum is reached, the valve starts to open and reaches full lift within 100% vacuum increase. The tank vacuum is maintained up to the set vacuum with a tightness that is above the normal standards due to our highly developed manufacturing technology. This feature is ensured by valve seats made of high quality stainless steel with precisely lapped valve pallets and a reinforced housing design. After the vacuum is balanced, the valve re-seats and provides a tight seal.

The optimized fluid dynamic design of the valve body and valve pallet is a result of extensive research and development, resulting in stable operation of the valve pallet, optimized performance, and reduced product losses.


DN300 / 12"
a 946 / 37.24
b 649 / 25.55
Dimensions in mm / inches Dimensions of pressure and vacuum relief valves with heating jacket upon request

Material selection for housing

Design ABC
HousingAluminiumSteelStainless Steel
Heating jacket (V/SV-XXL-H-...)SteelStainless Steel
Valve seatStainless SteelStainless SteelStainless Steel
CoverAluminiumSteelStainless Steel
Option: Housing ECTFE-coated Special materials upon request

Material selection for vacuum valve pallet

Design AB
Pressure range [mbar]

[inch W.C.]
-2.0 up to -9.0

-0.8 up to -3.6
<-9.0 up to -16

<-3.6 up to -6.4
Valve palletAluminiumStainless Steel
SealingMetal to MetalMetal to Metal
Special material as well as higher vacuum upon request

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 vacuum can be

achieved upon request with a special spring-loaded design. There are two different designs:

Pressure/vacuum valve in basic design

V/SV-XXL - –

Pressure/vacuum relief valve with heating jacket


Additional special devices available upon request.


Vacuum: -2.0 mbar -16 mbar
-0.8 inch W.C.
Higher vacuum settings upon request.

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”.