The Caleffi 502343A is a VALCAL Automatic Air Vent 1/2" NPT Male with Check Valve and Hygroscopic Cap. High-capacity automatic air vent for closed hydronic systems. The 5023 series check valve allows the vent to be replaced without purging the system.
Supplied as an individual service or field-installed component for Caleffi hydraulic separator, HydroCal and SEP4 installations. It is not a standalone separator.
Technical Specifications
| Connection | 1/2" NPT male |
| Maximum Working Pressure | 150 psi (10 bar) |
| Maximum Venting Pressure | 60 psi (4 bar) |
| Maximum Working Temperature | 230 °F (110 °C) |
| Body Material | Brass |
| Float Material | Polypropylene (PP) |
| Seals | Peroxide-cured EPDM |
| Check Valve | Included (5023 series) |
| Hygroscopic Cap | Included |
| Product Type | Air Vent |
Specifications on this page are taken from the Caleffi North America documents linked below. Last verified July 2026.
Documentation
Related Products
- Caleffi NA39589 : Ball Valve 3/4" Female-Female
- Caleffi 501502A : MAXCAL Automatic Air Vent 3/4" NPT Female
Frequently Asked Questions
What is the Caleffi 502343A used for?
High-capacity automatic air vent for closed hydronic systems. The 5023 series check valve allows the vent to be replaced without purging the system. It is supplied as an individual service or field-installed component.
Is the Caleffi 502343A a complete separator?
No. The 502343A is an air vent that is fitted to or supplied with a Caleffi separator. It does not provide hydraulic, air, dirt or magnetic separation on its own.
- Type:
- Air Vent
- Product Line:
- Separator Accessories
- Accessory Category:
- Air Vent
- Body Material:
- Brass
- Connection Type:
- NPT Male
- Connection Size:
- 1/2 inch
- ASME Code Stamped:
- No
