Skip to main content


Vacuum Relief Valve

  • “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

Función y Descripción

The V/SV type PROTEGO® valve is a highly developed vacuum relief valve with excellent flow performance. It is primarily used as a device for relieving vacuum in tanks, containers and process engineering equipment. The valve offers reliable protection against vacuum, and prevents inbreathing of air close to the set pressure.

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 of the tank and still safely vent the required mass flow.

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 they enable the use of corrosive media. After the vacuum is relieved, the valve reseats and provides a tight seal again.

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.


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"
a249* / 9.8*249312358443520588588
b325* / 12.79*337400514713808925925
Dimensiones en mm / pulgadas Dimensions for vacuum relief valve with heating jacket upon request

Selección de materiales para la vivienda

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

Selección de materiales para la válvula de vacío

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

Tipo de bridas de conexión

EN 1092-1; Form B1
ASME B16.5 CL 150 R.F.
other types upon request

Modelo y especificación

There are two different designs:

Vacuum valve in basic design

V/SV - –

Vacuum valve with heating jacket

V/SV - H

Additional special devices available upon request


Vacuum: -2.0 mbar -60 mbar
-0.8 inch W.C. -24 inch W.C.
Higher vacuum settings upon request.

Diagrama de flujo volumétrico

Los diagramas de flujo volumétrico han sido determinados con un banco de pruebas de caudal calibrado y certifi - cado por TÜV. El flujo volumétrico V. en [m³/h] y el CFH se refi eren a las condiciones estándar de referencia de aire según ISO 6358 (20°C, 1bar). La conversión a otras densidades y temperaturas están referidas en el Vol. 1: “Fundamentos Técnicos”.