The Caleffi 502640 is a ROBOCAL air vent with 1/2" metric-thread connections. Installed at system high points, its float-operated valve automatically releases air that accumulates in heating and air-conditioning circuits.
Best for automatic air release at system high points.
Specifications sourced from Caleffi North America technical literature. Last reviewed July 2026.
Key Features
Float-Operated Venting
As air collects in the vent body the internal float drops, opening the release valve; the valve closes automatically as the fluid level recovers.
System Protection
Continuous automatic air release helps reduce oxygen-driven corrosion, trapped-air noise in emitters and cavitation at circulator pumps.
Technical Specifications
| Function | Automatic float air vent |
| Series | Caleffi ROBOCAL |
| Connection | 1/2 in metric thread |
| Body material | Brass |
| Maximum operating pressure | 10 bar |
| Maximum air discharge pressure | 6 bar |
| Medium temperature range | 0 - 115 °C |
| Shipping Weight | 0.5 lb |
Documentation
Design Resources
Related Products
- Caleffi 502420 : ROBOCAL Air Vent 1/4" Metric Thread
- Caleffi 502630 : ROBOCAL Air Vent 3/8" Metric Thread
- Caleffi 502610A : ROBOCAL Air Vent 1/8"
- Caleffi 502620A : ROBOCAL Air Vent 1/4"
Frequently Asked Questions
What does Caleffi 502640 do?
Caleffi 502640 is an air vent in the Caleffi ROBOCAL range. It automatically releases air that accumulates in the system, helping prevent oxygen-driven corrosion, trapped-air noise and pump cavitation.
What connection does Caleffi 502640 use?
It is supplied with 1/2" connections. Other sizes and connection styles in the ROBOCAL range are listed under Related Products.
What are the pressure and temperature limits of Caleffi 502640?
Maximum operating pressure is 10 bar, over a medium temperature range of 0 - 115 °C.
What is the warranty on Caleffi 502640?
Caleffi covers this product under its standard two-year limited warranty against defects in material and workmanship from the date of shipment. ZOT Supply is an authorized Caleffi distributor.
- Product Type:
- Air Vent
- Series:
- ROBOCAL
- Connection Size:
- 1/2 in
- Max Operating Pressure:
- 10 bar
- Medium Temperature Range:
- 0 - 115 deg C
- Body Material:
- Brass
