Caleffi Z57 2-Way Valve, 1-1/4″ Sweat, 7.5 Cv, 20 psi ΔP, Normally Closed Spring Return Valve Actuator, 24V AC, On/Off Control Signal, (1) SPST 0.4A Auxiliary Switch, Terminal Block

Description

Caleffi Z57 : 2-Way Valve, 1-1/4″ Sweat, 7.5 Cv, 20 psi ΔP, Normally Closed Spring Return Valve Actuator, 24V AC, On/Off Control Signal, (1) SPST 0.4A Auxiliary Switch, Terminal Block

The Caleffi Z57 is a 2-way motorized zone valve assembly featuring a 1-1/4″ sweat valve body paired with a Z151000 normally closed spring-return actuator. It offers precise on/off control for hydronic heating and cooling systems and automatically returns to the closed position when power is removed. The terminal block connection design provides secure and efficient wiring for installation.

Certified to UL873, cULus, and CE standards, this valve assembly meets UL 1995 section 18 requirements for air plenums and ducts. The actuator includes an integrated SPST auxiliary microswitch for system feedback or control interlock. The durable brass valve body with stainless steel stem and EPDM seals ensures long service life and resistance to corrosion and high temperatures.

Key Features

• 2-way motorized zone valve assembly with normally closed actuator
• 1-1/4″ sweat connection for larger hydronic system piping
• Spring-return actuator closes automatically on power loss
• Terminal block for simple, secure electrical connection
• Integrated SPST auxiliary microswitch (0.4A @ 24V AC)
• UL, cULus, and CE certified for air plenum and duct applications

Technical Specifications

• Valve Type: 2-Way Straight
• Connection Type: 1-1/4″ Sweat
• Maximum Operating Pressure: 300 psi
• Maximum ΔP: 20 psi
• Cv Rating: 7.5 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