The PROTEGO® VN-VL-L is a highly advanced vacuum relief valve designed to protect storage tanks, containers, and process systems from critical vacuum conditions. With its precise 10% full-lift technology, the valve ensures quick and safe venting while minimizing pressure fluctuations. It delivers exceptional flow capacity and tight sealing performance, making it ideal for systems requiring maximum protection against in-breathing and collapse. Designed for use in explosion-hazardous areas and harsh outdoor environments.
up to 400
-2.7 to -70 mbar
Full lift at 10% vacuum
300, 350, 400 (larger sizes on request)
Reaches full capacity at 10% vacuum over setpoint
Explosion-proof area compliant Outdoor weather-protected design
Housing: Aluminum, Steel, Stainless Steel, with optional ECTFE lining Valve Pallet: Aluminum or Stainless Steel (thin/thick depending on range) Sealing: Metal-to-metal
-2.7 mbar to -70 mbar (–1.08 to –28 in. W.C.)
Stainless steel valve seat with precisely lapped valve pallet
EN 1092-1 Form B1
ASME B16.5 Class 150 R.F.
Heating jacket upon request Automatic condensate drain
Large storage tanks and silos
Chemical and petrochemical industries
Pharmaceutical manufacturing
Biogas, waste gas, or aggressive vapors handling
API standard tanks requiring vacuum protection
Inert and reactive gases
Vapors from hydrocarbons, solvents, and corrosive media
Biogas, landfill gas, and chemical off-gases
Prevents tank implosion under vacuum
High tightness minimizes emissions
Fast response and reseating after vacuum relief
High flow performance with TÜV-certified calibration
Can be custom-configured for higher vacuum ratings
Heating jacket for cold or sticky media
Special material designs for aggressive chemicals
Flow direction indicator
Custom flanges and sealing materials
Configurable valve pallet thickness and materials
From forging and casting to machining, assembly, and testing — every step is managed under one roof to ensure consistent quality, faster lead times, and zero compromise.
Get in touch with our team for additional information on product pricing, technical data, project support and more.
