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Steam Specialties

Water Vent Valves

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Model 550 – Part No. 401476 – Air Chamber

  • For use on convectors which are not provided with built-in air chambers or air collection fittings • Brass construction.
  •  1⁄4″ NPT straight shank connection tapped at the top for 1⁄8″ NPT connection
  • 6 cubic inch (98.3cm) volume
  • Maximum water pressure 100 psig (6.9 bar)
  • Maximum steam pressure 25 psig (1.7 bar)

Model 508 – Part No. 401475 Water Vent Valve

  • For automatic or manual venting systems
  • Ideal for use with Model 550 Air Chamber
  • Disc-type vent
  • Built-in check valve
  • Cartridge with discs can be replaced without draining the system
  • 1⁄8″ NPT straight shank
  • Maximum water pressure 50 psig (3.5 bar)
  • Maximum pressure 50 psig (3.5 bar)

Model 790 – Part No. 401479 Water Vent Valve

  • For removing air from convectors, baseboard and wall radiation
  • Safety drain connection for discharging moisture
  • Fitting and ferrule for 3⁄16″ (4.8mm) OD tubing
  • Telescopic siphon tube
  • 1⁄8″ NPT straight shank
  • Maximum operating pressure 30 psig (2.1 bar)*
  • Maximum pressure 30 psig (2.1 bar)

Model 791 – Part No. 401482 Water Vent Valve

  • For convectors and small mains
  • Safety drain connection for discharging moisture
  • Fitting and ferrule for 3⁄16″ (4.8mm) OD tubing
  • Telescopic siphon tube
  • 1⁄4″ NPT straight shank
  • Maximum operating pressure 50 psig (3.5 bar)*
  • Maximum pressure 50 psig (3.5 bar)

Model 792 – Part No. 401494 High Pressure Water Vent Valve

  • For releasing air from hot or cold water or glycol mains,hydronic heating and chilling systems, storage and processing tank filters, centrifugal pumps with specific gravity greater than 0.7
  • Cast iron body and cover, stainless steel interior
  • Maximum operating pressure 250 psig (17.3 bar)*
  • Maximum hydrostatic pressure 350 psig (24.2 bar)
  • Maximum temperature 300°F (149°C)
  • Hoffman Specialty 792 High Pressure Water Main Vent Valve HS-103C