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551 Series Cryogenic Vapor Vent

Cryogenic vent to keep liquid nitrogen at the point-of-use
5512104-01-1 shown

The 551 Series Cryogenic Vapor Vent (also called "keep-full" device) keeps liquid flowing in a vacuum-insulated pipe system by allowing the boil-off gases to vent while maintaining the liquid. Installing a cryogenic vapor vent provides the most reliable way of maintaining "liquid nitrogen on demand" close to the point-of-use. The cryogenic vapor vent is available with an attached electrical heater to stop ice formation and prevent condensate on the floor and ceiling. The heater increases the temperature of the cryogen and expels it as vapor. This eliminates the need for insulation or vent piping in a large discharge area. To prevent injury, CONCOA recommends installing the heater guard protective mesh enclosure in conjunction with the cryogenic vapor vent with heater configuration (5512104-01-1). For more economical management of critical cryogenic applications, CONCOA suggests the fully customizable CryoWiz cryogenic switchover system.

  • Mechanical float valve requires no electrical or pneumatic assistance
  • Vacuum-insulated float assembly prevents frost and ice build-up
  • Check valve provides unobstructed flow in one direction and protects piping system
  • Stainless steel wetted parts provide improved media compatibility
  • Optional 1/2 in tube-style bayonet inlet design facilitates future piping system expansion
  • Optional vapor vent heater eliminates condensation and ice build-up on piping and fixtures
  • Internal thermostat on heater limits temperature and prevents thermal runaway
  • Exterior casing: 304 stainless steel
  • Capacity: 1000 BTU/hr
  • Max working pressure: 150 PSIG (10 BAR)
  • Max proof pressure: 225 PSIG (15 BAR)
  • Outlet connections: 1/2 in FNPT
  • Helium leak integrity: 1 x 10⁻⁸ scc/sec
  • Electric heater: 375-Watt (5512104)
  • Power requirements: 120 VAC (50 – 60 Hz) 5512104
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Part Number Description
5512100-01-1 Vacuum Insulated Cryogenic Vapor Vent, 1/2 in MNPT Inlet
5512101-01-1 Vacuum Insulated Cryogenic Vapor Vent, 1/2 in Male Bayonet Inlet
5512104-01-1 Vacuum Insulated Cryogenic Vapor Vent with 375-Watt Heater, 110V Power Cord, and 1/2 in MNPT Inlet
5512105-01-1 Heater Guard for Cryogenic Vapor Vent with Heater (5512104-01-1)
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ID Number
Cryogenic Vapor Vents Catalog Page

WARNING: This product can expose you to chemicals including Lead, Chromium, Nickel, and 1-3 Butadiene, which are known to the state of California to cause cancer, birth defects, or other reproductive harm. And, this product can expose you to chemicals including Bisphenol A (BPA) which is known to the State of California to cause female reproductive harm. For more information go to www.