The Caleffi NA29284 is a solar-rated shut-off valve with 1/2 in. female NPT x 1/2 in. male NPT connections, used to isolate a Caleffi 250041A solar automatic air vent after the collector loop has been filled.
Specifications sourced from Caleffi technical brochure 01133 NA. Last reviewed August 2026.
Key Features
Solar-Rated Isolation Valve
Chrome-plated brass body and ball with PTFE seals, rated -20 to 360 deg F (-30 to 180 deg C) and 150 psi (10 bar) with water or glycol solutions to 50 %.
Matched to the 250 Series Air Vent
Sized and threaded 1/2 in. female NPT x 1/2 in. male NPT to fit directly under a Caleffi 250041A solar automatic air vent.
Required for Correct Vent Operation
Caleffi specifies that solar automatic air vents always be installed with a shut-off valve so they can be isolated once the loop is filled and for maintenance.
Chrome-Plated Brass Body and Ball
Caleffi builds this code with a chrome-plated brass body and a chrome-plated brass ball, with PTFE seals.
Technical Specifications
| Product Type | Solar Air Vent Shut-Off Valve |
| Application | Closed solar thermal systems |
| Connections | 1/2 in. female NPT x 1/2 in. male NPT |
| Connection type | NPT |
| Medium | water, glycol solutions |
| Max. percentage of glycol | 50 % |
| Working temperature range | -20 to 360 deg F (-30 to 180 deg C) |
| Max. working pressure | 150 psi (10 bar) |
| Dimensions | A 1/2 in.; B 2-7/8 in.; C 1/2 in.; D 1-1/2 in. (letters per dimension drawing in brochure 01133 NA) |
| Body material | brass, chrome plated |
| Ball | brass, chrome plated |
| Seals | PTFE |
| Manufacturer-listed weight | 0.5 lb |
Documentation
Related Products
- Caleffi 250041A : Solar Automatic Air Vent 1/2" MNPT
- Caleffi 251004A : DISCALAIR Solar Air Vent 3/4" MNPT x 1/2" FNPT
- Caleffi 251003A : DISCAL Solar Air Separator 3/4"
- Caleffi 253040 : Solar Safety Relief Valve 150 psi
Frequently Asked Questions
What is Caleffi NA29284 used for?
It is the shut-off valve for a Caleffi 250041A solar automatic air vent. Caleffi specifies that solar air vents always be installed with a shut-off valve so they can be isolated after the loop is filled and for maintenance.
How is Caleffi NA29284 different from a standard ball valve?
Caleffi builds this code with a chrome-plated brass body and ball and PTFE seals, rated -20 to 360 deg F (-30 to 180 deg C) and 150 psi (10 bar) with water or glycol solutions to 50 %, and lists it specifically as the shut-off valve for the 250 series solar air vent.
What connections does Caleffi NA29284 have?
1/2 in. female NPT x 1/2 in. male NPT, sized to fit directly between the pipe and a Caleffi 250041A solar automatic air vent.
What is the temperature rating of Caleffi NA29284?
Working temperature range is -20 to 360 deg F (-30 to 180 deg C) with a maximum working pressure of 150 psi (10 bar).
What is the warranty on Caleffi NA29284?
Caleffi North America covers this product under its two-year limited warranty against defects in material and workmanship from the date of shipment. ZOT Supply is an authorized Caleffi distributor.
- Product Type:
- Solar Air Vent Shut-Off Valve
- Application:
- Solar Thermal
- Connection Type:
- NPT
- Connection Size:
- 1/2 in.
- Max Operating Pressure:
- 150 psi (10 bar)
- Medium Temperature Range:
- -20 to 360 deg F (-30 to 180 deg C)
- Max Glycol Concentration:
- 50 %
- Body Material:
- Brass, chrome plated
