Product

Autovent

Air Purging Valve

Forged-brass automatic air vent that keeps water circuits free of trapped air.

A compact, float-operated air vent in forged brass. It releases trapped air from closed water systems automatically, and its shut-off connector lets you fit or remove it without draining the line.

Sizes: 10–25 mm
Pressure: PN16
Temperature: 0–120 °C
Body: Forged brass

Key features

Fully automatic — no manual bleeding needed
Removes trapped air that causes air locks, noise and corrosion
Helps maintain full flow and heat-transfer efficiency
Shut-off connector closes automatically when the vent is unscrewed
Service or replace the vent without draining the system
Four sizes: 10, 15, 20 and 25 mm
Rated PN16, 0 °C to 120 °C
Every body tested to 24 bar

Principle of working

How it works

1
Normal running

Water fills the body and lifts the float, holding the vent valve shut.
2
Air collects

Trapped air rises to the top of the body, pushing the water level and float down.
3
Air is released

The falling float pulls the valve off its seat and the air discharges.
4
Valve recloses

Water refills the body, lifts the float and reseals the valve automatically.

Design & construction

Built simple, built to last

What goes into the Autovent.

Simple design — a free-floating valve with very few moving parts
Body and top cover in forged brass (IS 8737 / IS 319)
Corrosion-resistant brass and PP working parts
Delrin float arm with SS304 spring and screw
NBR O-ring seal between body and cover
Brass hex-nut shut-off connector included with every size
Designed for working pressures up to PN16 (150 psig)

Applications

Where it's used

Typical installations where the Autovent delivers reliable performance.

High points in chilled- and hot-water pipework Fan-coil units and AHU coils Boilers, calorifiers and heating circuits Expansion and buffer vessels Pump sets and plant-room headers

Specifications