Pipeline ancillaries > Air vents
Spirax Sarco AVC32 Carbon Steel Air Vent
AVC32 is a Spirax Sarco carbon steel balanced-pressure thermostatic air vent for steam systems, fitted with an integral flat strainer screen. Pressure-bearing components are made by TÜV-approved suppliers to AD-Merkblatt WO/TRD100, making it suitable for higher-pressure steam mains and equipment high points where air and other non-condensable gases need to be removed.
Quick facts
AVC32 is a model-level route inside the wider air vents and air eliminators range. It suits steam-system users who have already moved from a category search to model selection, particularly for higher-pressure mains or installations that call for welded or flanged connections.
Within the same air vent range, AVC32 and the brass AV13 form a high/low pairing by material and pressure class. AV13 is oriented toward lower-pressure threaded applications, while AVC32 offers a carbon steel body, higher operating pressure and socket weld, butt weld or flanged connections for steam mains.
Available technical material (TI-P123-15) confirms the following:
AVC32 is a maintainable carbon steel balanced-pressure thermostatic air vent for steam systemsTÜV-approved suppliers to AD-Merkblatt WO/TRD1002014/68/EU, with EN 10204 3.1 certification availableKv value is 0.8 for all sizes| Item | Value |
|---|---|
| Body material | Carbon steel (DIN 17243 C22.8 / ASTM A105N) |
| Internal materials | Stainless steel (capsule, valve seat, strainer screen, spring) |
| Sizes | 1/2”, 3/4”, 1” (DN15, DN20, DN25) |
| Maximum allowable pressure PMA | 50 bar g @ 50 °C |
| Maximum allowable temperature TMA | 400 °C @ 35 bar g |
| Minimum allowable temperature | -60 °C |
| Maximum operating pressure PMO (saturated steam) | 32 bar g |
| Maximum operating temperature TMO | 287 °C @ 32 bar g |
| Minimum operating temperature | 0 °C |
| Cold hydraulic test pressure | 75 bar g |
AVC32 is also safe to use under full vacuum conditions.
The connection formats covered by the technical material include:
BSP T Rp (ISO 7-1) or NPTBS 3799EN 12627EN 1092 PN40, ANSI B16.5 Class 150 and 300, and JIS/KS 10K and 20KThe complete-unit specifications currently selectable at the top of this page focus on 1/2", 3/4" and 1" threaded BSP connections. Confirm welded or flanged requirements against site conditions before ordering.
AVC32 should be installed at the highest point of a steam main or item of equipment, where air collects most readily, with the capsule horizontal and the cover at the top. The discharge should be piped to a safe place, and the air vent itself must not be insulated. Fit isolation valves upstream and downstream to allow future maintenance.
Before specifying AVC32, confirm:
1/2", 3/4" or 1" size is required32 bar g saturated steam rangeTI-P123-15 covers the material construction, pressure and temperature limits, sizes and connection formats, Kv value, dimensions and spare parts for AVC32. Installation, maintenance and tightening torque detail is provided in the accompanying installation and maintenance guide (IM-P123-14).
Where the site problem centres on slow warm-up of higher-pressure steam mains, reduced heat transfer, gas accumulation in the steam space, or equipment high points that need continuous removal of non-condensable gases, and the connection format calls for welding or flanges, a carbon steel thermostatic air vent like AVC32 is generally a closer fit than a brass threaded model.
For lower-pressure systems based mainly on threaded connections, you can return to air vents and air eliminators to compare AV13 and other routes.
The AE30 series automatically removes air from hot- and cold-water liquid systems. View models and connections, pressure/temperature limits, free air capacity, installation, commissioning, maintenance, spares and ordering information.
AV13 is a Spirax Sarco brass balanced-pressure thermostatic air vent for steam systems. It is typically considered for high points on steam mains or equipment where air and other non-condensable gases need to be removed without manual venting.
Spirax Sarco AE14 is a maintainable SG iron float-operated automatic air vent with a Viton valve head for removing air and gases from compatible liquid systems.
AVC32 selection is normally focused on higher-pressure steam venting or applications that need welded or flanged connections, with operating pressure, connection format and installation position checked before ordering.
Return to air vents and air eliminators when AVC32 needs to be compared with AV13 or other steam, liquid-system or clean-steam venting routes across different materials, pressure classes and connection formats.
Use the wider pipeline ancillaries range when air removal is part of a broader line-protection decision involving separation, strainers, check valves or instrumentation.
Review air-venting guidance when warm-up time, air pockets, vent position or steam-space geometry still need to be confirmed.
