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Brass float air vent model 78 rated 150 PSI 825 lb/hr

BELL AND GOSSETT

BELL AND GOSSETT 78 Float Air Vent 150 PSI 825 lb/hr

SKU CH-TE8W-1HGS2

Float air vent releases trapped air from high-pressure hydronic systems up to 150 PSI with 825 lb/hr capacity

  • Float vent purges air automatically from hydronic systems
  • Brass body rated to 150 psi maximum operating pressure
  • Stainless-steel float handles 825 lb/hr condensate capacity
  • 3/4 in male NPT inlet suits standard piping connections
  • Designed for high-pressure hot, cold or glycol water mains

Purpose-built for high-pressure hydronic systems

The Bell & Gossett 78 float air vent is engineered for high-pressure hot or cold water and glycol mains. Its brass body and stainless-steel float handle a maximum operating pressure of 150 psi. The unit is designed to automatically release trapped air from piping networks, helping maintain efficient heat transfer and reduce noise in commercial and industrial hydronic installations.

3/4-inch NPT male inlet simplifies piping

The vent features a single 3/4-inch NPT male inlet port, allowing direct threaded connection to standard pipe fittings without adapters. A condensate capacity of 825 lb/hr ensures reliable venting under demanding flow conditions. The one-port configuration keeps the installation compact, while the float mechanism operates without external power or controls.

Threaded brass connection installs

Installation requires only a wrench to tighten the 3/4-inch NPT male threads into a compatible fitting, using appropriate thread sealant for a leak-free joint. The brass body resists corrosion from water and glycol mixtures. Ensure the system pressure does not exceed 150 psi and that the vent is oriented vertically for the float to operate correctly. Overtightening can damage the threads or body.

Highlights

  • Float vent purges air automatically from hydronic systems
  • Brass body rated to 150 psi maximum operating pressure
  • Stainless-steel float handles 825 lb/hr condensate capacity
  • 3/4 in male NPT inlet suits standard piping connections
  • Designed for high-pressure hot, cold or glycol water mains

Specifications

BrandBELL & GOSSETT

Questions about this item

Will the stainless steel float need periodic replacement in a high pressure hot water system?

The float is stainless steel and built for continuous service in high pressure hot or cold water or glycol mains, so it does not have a scheduled replacement interval.

What limits the 825 lb/hr condensate capacity during sustained operation?

The 825 lb/hr rating is the maximum condensate capacity at the 150 psi allowable pressure; sustained flow beyond that will exceed the vent's discharge capability.

How much heat does the brass body radiate when the vent runs all day on a 150 psi main?

The brass body dissipates heat from the process fluid, but surface temperature will track the system water or glycol temperature rather than generating its own heat load.

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