Caleffi Equipment — Hydronic Components & Valves

Supply of genuine Caleffi S.p.A. hydronic components and valves: 5350 and 5360 diaphragm pressure reducing valves, DISCAL 551 microbubble deaerators, DIRTMAG 5463 magnetic sludge separators, LEGIOMIX mixing units. Engineered selection, worldwide supply.

Caleffi 5350 series pre-adjustable pressure reducing valves

Direct-acting cartridge pressure regulators designed to protect commercial and domestic water distribution networks against high supply pressure.

Monobloc replaceable cartridge assembly integrating an 0.51 mm stainless steel strainer screen
Pre-adjustment knob with graduated pressure scale (1 to 6 bar) and radial pressure gauge port 1/4"
Dezincification-resistant alloy (DZR, CR grade brass) body eliminating selective leaching
Nominal connection sizes from 1/2" to 2" with male union tailpieces

Caleffi 5360 series industrial diaphragm pressure reducing valves

Heavy-duty pressure regulating valves for commercial boiler plants, municipal feeds, and industrial fluid circuits.

Maximum inlet pressure rating up to 25 bar with operating fluid temperatures up to 80 °C
Downstream adjustable pressure range from 0.5 to 6 bar with balanced seat architecture
Replaceable valve seat and internal control stem manufactured from high-grade stainless steel
Flanged (DN 50 to DN 100) and threaded executions delivering high flow coefficient Kvs values

Caleffi DISCAL 551 series microbubble air separators

Continuous inline deaerators designed to remove microbubbles from closed hydronic heating and cooling systems.

Internal stainless steel mesh element engineered to coalesce and release up to 99% of entrained microbubbles
High-capacity automatic float air vent chamber protected against fluid turbulence and debris
Operational rating up to 10 bar pressure, temperature limits from 0 to 110 °C, glycol up to 50%
Brass threaded versions (3/4" to 2") and epoxy-coated steel/ductile iron flanged models (DN 50 to DN 150)

Caleffi DIRTMAG 5463 series magnetic dirt separators

Hydrodynamic dirt separators equipped with external neodymium magnets for capturing sand, sludge, and magnetite.

External detachable ring housing two high-intensity neodymium rare-earth magnets (2 × 0.3 Tesla induction)
Comprehensive entrapment of non-magnetic impurities and heavy ferromagnetic magnetite particles
Fast blowdown and sediment flushing via bottom drain valve without system shutdown
Rotatable brass tee fitting allowing versatile mounting on horizontal, vertical, or 45-degree piping

Caleffi LEGIOMIX electronic mixing valves and thermostatic mixing stations

Sanitary hot water mixing valves series 520/521 and digital hybrid units series 6000 featuring anti-scald and thermal disinfection.

LEGIOMIX 6000 programmable controller running automated anti-Legionella thermal disinfection schedules
High-sensitivity thermostatic sensing cartridge with instant fail-safe thermal shut-off against cold water failure
Stable mixed outlet temperature regulation maintained within a strict ±1 °C operating tolerance
Integrated data logger recording system operating temperatures with Modbus BMS building network capability

Caleffi safety relief valves series 311, 513, and ALIMATIC filling units

Spring-loaded overpressure relief valves and automatic makeup modules for heating boilers, storage calorifiers, and solar circuits.

Certified according to European Pressure Equipment Directive PED 2014/68/EU (Category IV) and EN ISO 4126-1
Factory pre-set discharge calibrations ranging from 1.5 to 8 bar protected with tamper-evident caps
High-temperature EPDM diaphragm and seat seal rated for continuous exposure to 110 °C
ALIMATIC 553 series automatic filling unit assemblies incorporating check valve, manual shut-off, and pressure gauge

Caleffi SEPCOLL 559 series hydraulic separator-distributor headers

Engineered multi-functional combinations of low-loss hydraulic headers and distribution manifolds for multi-zone heating plants.

Complete hydraulic decoupling between boiler primary circulation loops and secondary distribution circuits
Integrated air separation ports at top elevation and lower collection sump with manual drain cock
Factory-supplied pre-formed polyurethane foam thermal insulation shells reducing standby heat losses
Threaded union outlets tailored for direct coupling with modular pump-mixing station stations

Caleffi 626 series mechanical paddle flow switches

Inline flow sensing switches engineered to protect circulating pumps, chillers, and heating loops against dry running.

Interchangeable stainless steel paddle blade kit accommodating pipe bore diameters from 1" to 8" (DN 25 to DN 200)
SPDT snap-action microswitch electrical contacts rated up to 15 A at 250 V AC inductive/resistive loads
IP 54 weather-proof enclosure equipped with threaded PG 13.5 industrial cable gland
Maximum fluid operational pressure of 10 bar across operating temperatures up to 110 °C

The Caleffi manufacturer

Caleffi S.p.A. was founded in Italy in 1961 and stands as a premier European manufacturer of advanced hydronic components for heating, air conditioning, and domestic plumbing networks. Equipment is manufactured across 4 Italian factories under ISO 9001 certification.

Engineering Selection of Caleffi Pressure Reducing Valves

When specifying Caleffi pressure reducing valves for commercial HVAC and domestic water networks, flow velocity and downstream demand take precedence over nominal pipe diameter.

The direct-acting 5350 series features a pre-adjustment dial enabling precise pressure setting prior to system commissioning.

For high-capacity boiler feed lines and district heating sub-stations, the heavy-duty 5360 series provides flanged and threaded options engineered to absorb upstream hydraulic shock up to 25 bar.

Provide pipeline operating pressure, target downstream setpoint, and media temperature to calculate the optimum Kv flow coefficient.

Microbubble Separation Mechanics in DISCAL Deaerators

Entrained air and dissolved gases accelerate corrosion in steel radiators and induce cavitation damage on circulating pump impellers. Caleffi DISCAL 551 series deaerators utilize a dense stainless steel mesh coalescing element to force microbubbles out of fluid circulation.

As heating or cooling water traverses the expanded chamber, stream velocity decelerates, allowing tiny bubbles to attach to the wire mesh, coalesce, and rise into the automatic float air vent. The vent chamber exhausts accumulated gas continuously while handling glycol concentrations up to 50%.

Magnetic Magnetite Removal with DIRTMAG Technology

Closed hydronic loops suffer from progressive buildup of abrasive magnetite sludge generated by internal ferrous corrosion. Ferromagnetic particles deposit inside wet-rotor high-efficiency ECM pumps, causing mechanical friction and premature motor failure.

Caleffi DIRTMAG 5463 magnetic dirt separators capture both non-magnetic debris and microscopic iron oxides via an external dual neodymium magnet collar (2 × 0.3 Tesla).

Flushing captured sludge takes under a minute by removing the magnetic ring and opening the blowdown valve during full operational flow.

Legionella Thermal Disinfection with LEGIOMIX Systems

Commercial domestic hot water networks require rigorous temperature control to prevent the proliferation of Legionella pneumophila bacteria. The Caleffi LEGIOMIX 6000 series combines high-precision thermostatic mixing with an integrated programmable microcomputer controller.

During normal distribution hours, mixed water is regulated within ±1 °C of the setpoint with fast anti-scald thermal shut-off protection.

During programmed night hours, the controller executes automated thermal pasteurization cycles, raising circulation loop temperatures above 60 °C and logging validation telemetry via Modbus.

Safety Relief Valves and Automatic System Makeup

Caleffi 311 and 513 series spring-loaded diaphragm safety relief valves safeguard heating boilers and unvented hot water cylinders against catastrophic overpressure events.

Manufactured under European Directive PED 2014/68/EU (Category IV) and EN ISO 4126-1, each unit undergoes factory calibration and tamper-evident sealing.

To replenish system fluid losses while preventing backflow into potable supply lines, Caleffi ALIMATIC 553 pre-assembled filling units incorporate an adjustable pressure reducer, upstream strainer screen, verifiable check valve, and manual isolation tap.

Modular Plant Decoupling with SEPCOLL Manifolds

Variable flow distribution across multi-zone heating and cooling circuits often causes severe hydraulic interference with primary boiler and chiller flows. Caleffi SEPCOLL 559 series combines a low-loss hydraulic decoupling chamber with an integrated supply and return distribution manifold.

The mono-block design guarantees independent circuit operation, eliminates circulation pump conflicts, and provides built-in deaeration and sediment drainage ports. Factory-molded high-density polyurethane insulation shells eliminate standby thermal radiation losses in boiler mechanical rooms.

Dry-Run Pump Protection with Series 626 Flow Switches

Caleffi 626 series mechanical paddle flow switches provide vital operational interlocking for booster pumps, industrial chillers, and thermal cooling towers. As flow velocity declines below the threshold, the internal spring mechanism triggers a snap-action SPDT microswitch rated for 15 A.

Supplied with a set of modular stainless steel paddle blades, the switch adapts readily to pipe nominal diameters from 1" up to 8" (DN 25 to DN 200). An IP 54 weather-proof enclosure and reinforced brass body ensure long service life in moist mechanical plant environments.

Distinguishing Industrial Hydronics from Consumer Textile Brand

Italian engineering manufacturer Caleffi S.p.A. (operating commercially as Caleffi Hydronic Solutions with headquarters in Fontaneto d'Agogna, Novara) specializes exclusively in advanced hydronic valves, plumbing components, and HVAC engineering systems.

The corporation is completely separate from Caleffi S.p.A. (Caleffi Home, Viadana, Mantua), a manufacturer of household bed linen and duvets, as well as unrelated tableware brands. We supply genuine Caleffi hydronic equipment and replacement components manufactured in Italy.

Valve availability, replacement cartridge pricing, and delivery schedules are calculated specifically based on your HVAC plant or water network engineering parameters. Official distributorship is not claimed.