E121
Automatic Air Vent
Design
The automatic air vent comprises:
Housing
Lid
Float
Valve seat seals
Materials
Brass housing
Brass lid
High grade, heat-resistant synthetic material float
Heat-resistant elastomer seal components
Application
The E121 Air Vent is a reliable automatic venting device and is suitable for venting of air or gas from heating systems or heat process installations.
Features
With the Z121 A shutoff valve fitted, cleaning or re-placement of the seal and inner components can be carried out without draining the system.
Range of Application
Hot water heating systems, radiators, wall and ceiling-mounted air heaters, air collection vessels, pipework circuits, boilers and air separators
Not suitable for mineral oil or liquids with mineral-oil-based additives.
Specifications
Operating temperature max. 110C (230F)
Operating pressure max. 10 bar (145 P.S.I.)
Connection sizes R 1/2"
PRODUCT DATA
Function
Inside the automatic air vent there is a float which operates a lever according to the water level. When there is no water in the housing, then the float opens the valve. Air can therefore be vented from the heating system during filling. When the heating system has been filled, the inflowing water closes the valve and the vent is shut off. Water usually contains oxygen which bubbles off during operation of the system and collects at the highest point.
The automatic air vent must therefore be fitted at the air collection position (highest point on a boiler or pipework circuit).
link 3/8":
https://www.tokopedia.com/valvebesipvc/automatic-air-vent-honeywell-dia-3-8-inch-air-vent-3-8