Caleffi Z42 : 2-Way Valve, 1/2" SAE Flare, 3.5 Cv, 30 psi ΔP, Normally Closed Spring Return Valve Actuator, 24V AC, On/Off Control Signal, (1) SPST 0.4A Auxiliary Switch, 18" Wires
The Caleffi Z42 is a 2-way motorized zone valve assembly featuring a 1/2" SAE flare brass valve body paired with a Z111000 normally closed spring-return actuator. This combination provides precise on/off flow control for hydronic heating and cooling systems. The valve closes automatically when power is removed, offering dependable performance for system isolation and control.
The assembly is UL873, cULus Listed, and CE certified, meeting UL 1995 section 18 standards for air plenums and ducts. It includes an integrated SPST auxiliary microswitch for control feedback or interlock. Designed for long service life, the Z42 features a stainless steel stem, EPDM seals, and brass construction for durability and corrosion resistance in hydronic applications.
Key Features
- 2-way motorized zone valve with normally closed actuator
- 1/2" SAE flare connections for easy installation
- Spring-return actuator automatically closes when power is removed
- Integrated SPST auxiliary microswitch (0.4A @ 24V AC)
- Stainless steel stem with EPDM seals for leak-free operation
- UL, cULus, and CE certified for air plenum and duct use
Technical Specifications
- Valve Type: 2-Way Straight
- Connection Type: 1/2" SAE Flare
- Maximum Operating Pressure: 300 psi
- Maximum ΔP: 30 psi
- Cv Rating: 3.5 gpm
- Medium Temperature Range: 32–240 °F
- Electric Supply: 24V AC
- Power Consumption: 7 VA (at full capacity)
- Auxiliary Switch Rating: 0.4A @ 24V AC
- Maximum Glycol Concentration: 50%
- Medium: Water, glycol solutions, vapor (max 15 psi)
Datasheets
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Caleffi Z-One Motorized Zone Valve Installation and Commissioning Manual |
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- Valve Pattern:
- 2-Way
- Valve Size:
- 1/2 Inch
- Connection Type:
- Sweat
- CV Rating:
- 2.5
- GPM:
- 5.0 @ 4 psi
- Actuator Type:
- Non Fail-Safe
- Voltage:
- 24VAC
- Control Signal:
- On/Off
- Auxillary Switch:
- Yes
- NEMA 4X Enclosure:
- No
