Spirax Sarco HM12/12 Balanced Pressure Thermostatic Air Vent

Description

The Spirax Sarco HM12/12 is a high-quality, balanced pressure thermostatic air vent engineered for the automatic removal of air and other non-condensable gases from steam systems. Its robust cast iron construction ensures durability and reliability. By efficiently venting air, this device improves heat transfer, reduces start-up times, and minimizes the risk of corrosion within the system. This is a new old stock item, offering the performance of an original component.

Specifications

• Manufacturer: Spirax Sarco
• Model: HM12/12
• Variant: E16
• Type: Balanced Pressure Thermostatic Air Vent
• Maximum Differential Pressure (PMO): 4 bar
• Maximum Operating Temperature (TMO): 204 deg C
• Body Material: GG20 Cast Iron
• Body Pressure Rating: PN16
• Connections: Threaded

Label Info

• Brand: Spirax Sarco
• Model: HM12/12
• Pressure: 4 bar
• Temperature: 204 deg C

Application

This air vent is suitable for use in steam mains, heat exchangers, process vessels, and other steam-using equipment where the presence of air can hinder performance and cause damage.

Country of Origin

Made in France.

CO2 Impact

By reusing this component, you are avoiding approximately 7.0 kg of CO2 emissions associated with the production of a new one. This choice supports a circular economy and reduces industrial waste.

Availability

This is an obsolete item. Availability is limited to existing stock. Order now from PLC2Day for expert support and fast delivery.

FAQ

Question?
What is the primary function of the HM12/12 air vent?

The HM12/12 is a thermostatic air vent designed to automatically remove air and other non-condensable gases from steam systems, which improves heat transfer efficiency and prevents corrosion.

Question?
Is this unit suitable for applications with pressures higher than 4 bar?

No, the '4 bar' rating on the tag indicates the maximum differential pressure (PMO) for this specific thermostatic element. While the body is rated PN16, the internal element is calibrated for a maximum of 4 bar.

Question?
What does the 'GG20' marking on the body mean?

GG20 is a DIN standard designation for a type of flake graphite cast iron. It indicates the material of the valve body, known for its good pressure tightness and durability in steam applications.

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Last Update: Friday, March 13, 2026