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Caleffi

Founded 1961 Italy premium price 1,500+ employees

About Caleffi

Caleffi S.p.A. is an Italian manufacturer of innovative components and systems for plumbing, heating, cooling, and renewable energy applications. Founded in 1961 and headquartered in Fontaneto d'Agogna, Italy, the company operates five manufacturing plants across Europe and has a strong presence in North America through Caleffi North America based in Milwaukee, Wisconsin. Caleffi is globally recognized for precision-engineered valves, air separators, and hydronic system controls.

Known for: Precision Italian-engineered pressure reducing valves, thermostatic mixing valves, and hydronic system components

Product Categories

Valves

Caleffi manufactures Italian-engineered pressure reducing valves, thermostatic mixing valves, zone valves, backflow preventers, air separators, and expansion vessels for hydronic heating/cooling and domestic plumbing systems. Their 535H Series PRV and 521 Series mixing valves are widely specified in commercial and residential applications.

Product Lines: 535H PRV Series 521 Mixing Valves Z-One Zone Valves DISCAL Air Separators Backflow Preventers
View Caleffi Valves

Certifications & Standards

ASSE Listed CSA Certified NSF/ANSI 61 ISO 9001

Warranty

Varies by product; most valves carry a manufacturer warranty against defects

Related How-To Guides

How to Replace a Shut-Off Valve

Swap a stuck, leaking, or unreliable shut-off valve for a modern quarter-turn ball valve -- compression, threaded, and push-fit connections all covered.
How to Adjust a Pressure Reducing Valve

Test your water pressure, find the PRV on your main line, and adjust it to a safe 50-60 PSI -- before high pressure wears out your fixtures, appliances, and water heater.
How to Fix a Leaking Gate Valve

Stop a dripping gate valve stem -- tighten the packing nut, replace the packing, or swap the whole valve for a ball valve, depending on what the situation calls for.

Common Problems

Stuck Shut-Off Valve

Usually discovered during an emergency -- something is leaking and the valve will not budge. Older gate valves seize after years of disuse. Fix ranges from penetrating oil and patience to full replacement.
Leaking Valve Stem

Water dripping from around the valve handle or packing nut -- packing failure, not a pipe leak. Fix is usually tightening the nut or replacing the packing, often with the water still on.
PRV Failure -- High Water Pressure

Failing PRV lets dangerously high pressure into the house. Bursts supply lines, damages appliances, causes hammer, shortens fixture life, leaks everywhere. Normal is 40-60 PSI. Above 80 is dangerous and needs immediate attention.