Caleffi 551008AC DISCAL Air Separator 1-1/2" FNPT with Expansion Tank Check Valve, 150 psi

The Caleffi 551008AC is a 1-1/2" DISCAL Air Separator with female NPT threaded connections and an expansion tank check valve. It continuously removes air and microbubbles from closed-loop hydronic systems.

DISCAL separators work on the coalescing principle: an internal element causes entrained air and microbubbles to combine and rise into the upper chamber, where a float-operated automatic air vent releases them. Removing air reduces noise, corrosion and pump cavitation and improves heat transfer in closed-loop hydronic heating and cooling systems. This version includes a service check valve on the expansion tank connection, so the tank can be serviced or replaced without draining the system.

Before ordering, confirm the 1-1/2" female NPT threaded connection matches your main piping, and that the system stays within 150 psi and 250F. Install it on the supply side where water temperature is highest for best air removal.

Specifications

• Brand: Caleffi
• Manufacturer Part #: 551008AC
• Series: DISCAL (551 Series)
• Type: Air Separator
• Size: 1-1/2"
• Connection: female NPT threaded
• Max Temperature: 250F
• Max Pressure: 150 psi
• Material: Brass
• Includes: Service check valve for expansion tank connection
• UPC: 8016615963250
• Category: Air Separators

Documents

• Technical Data Sheet (PDF)
• Installation & Operation Manual (PDF)
• Submittal Sheet (PDF)
• Product Brochure (PDF)

See also: air separators, all Caleffi products.