Product

Autovent SS304/316

Air Purging Valve

Stainless-steel automatic air vent for chilled-water, brine and corrosive duties.

A stainless-steel version of our automatic air vent for duties where brass is not suitable. A male taper thread lets it mount directly on top of an isolation valve.

Size: 25 mm
Pressure: PN16
Temperature: −10–90 °C
Body: CF8 / CF8M

Key features

Fully automatic — no manual bleeding needed
Cast stainless body in CF8 (SS304) or CF8M (SS316)
Suits water and brine, including corrosive duties
Stainless arm, spring and screw; EPDM seal
BSPT male thread — mounts directly on an isolation valve
Rated PN16, −10 °C to 90 °C
Body tested to 33 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 SS304/316.

Simple design — a free-floating valve with very few moving parts
Body and top cover cast in ASTM A351 CF8 / CF8M stainless steel
Corrosion-resistant SS304 / SS316 working parts
Float in HD / LD or SS304 / SS316 to suit the duty
EPDM O-ring, suitable for water and brine
Designed for working pressures up to PN16

Applications

Where it's used

Typical installations where the Autovent SS304/316 delivers reliable performance.

Chilled-water and brine systems Corrosive or treated-water circuits Process cooling and industrial plant Coastal or humid installations where brass corrodes

Specifications