Hoffman Water Vent Valves

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)