BELL AND GOSSETT
BELL AND GOSSETT 79 Float Air Vent 75 PSI 825 lb/hr
Float air vent removes air from hot, cold or glycol water systems up to 75 psi with 825 lb/hr capacity
- Float vent removes air from hydronic systems
- Brass body with stainless-steel float resists corrosion
- Rated for 75 psi maximum operating pressure
- 825 lb/hr condensate capacity handles high-volume flow
- ¾ in NPT male bottom inlet fits standard piping
Float Air Vent for Hydronic Systems
The Bell & Gossett 79 is a float-type air vent designed for hot water, cold water or glycol mains in hydronic heating and cooling installations. Its brass body and stainless steel float handle a maximum operating pressure of 75 psi while venting up to 825 lb/hr of condensate. The single-port configuration with a 3/4 inch male NPT bottom inlet suits residential and light commercial piping.
Passive Operation and Pressure Handling
The vent operates without external power, relying on the stainless steel float to open and close the valve as air accumulates and is expelled. Brass construction resists corrosion from treated water or glycol mixes at the rated 75 psi limit. No electrical connections or control wiring are required, so noise and power draw are non-existent during normal system operation.
Brass Body With Stainless Float
The all-metal construction uses brass for the body and stainless steel for the float, providing durability in closed-loop hydronic systems. The 3/4 inch male NPT bottom inlet threads directly into standard fittings without adapters. The one-port design means air vents in a single direction, so installers must orient the unit at a high point in the piping where air naturally collects.
Highlights
- Float vent removes air from hydronic systems
- Brass body with stainless-steel float resists corrosion
- Rated for 75 psi maximum operating pressure
- 825 lb/hr condensate capacity handles high-volume flow
- ¾ in NPT male bottom inlet fits standard piping
Specifications
| Brand | BELL & GOSSETT |
|---|
Questions about this item
How do I install the BELL AND GOSSETT 79 float air vent and what is the step people often get wrong?
Thread the 3/4-inch male NPT inlet into a bottom port on the hot, cold or glycol water main; the step often missed is using pipe sealant rated for 75 psi service so the brass body seats without leaks.
What maintenance or replacement will the 79 float air vent need later?
Inspect the stainless-steel float and brass seat annually; if the 825 lb/hr condensate capacity drops or the vent leaks, replace the float assembly rather than the whole valve.
What limit appears first on the 79 float air vent under sustained use?
The 75 psi maximum operating pressure is the first hard limit; sustained pressure above that rating will deform the brass body before the float mechanism reaches its capacity ceiling.
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