The Caleffi Z57 is a factory-matched Z-one 2-way motorized zone valve: a Z200737 valve body with 7.5 Cv and 20 psi close-off, paired with the Z151000 normally closed spring-return actuator, terminated in 1-1/4" Sweat connections.
Best for zoning a hydronic circuit from one part number instead of specifying body, actuator and tail pieces separately.
Warranty
Key Features
Supplied as a Matched Assembly
Ships as Z151000 actuator plus Z200737 valve body, so the body, actuator and end connections are already matched.
Normally Closed Spring Return
The actuator springs the paddle back to the closed position in 6 seconds when power is removed, with no stored energy source required.
7.5 Cv at 20 psi Close-Off
The Z200737 body seats 100 percent bubble-tight against differential pressure up to 20 psi.
Auxiliary Microswitch Rated 0.0 - 0.4 A @ 24 V
The switch trips at 60 percent open or on manual opening. The 24 V sealed reed switch drives relays, boiler TT contacts and DDC inputs with no minimum current load.
Serviceable Without Cutting Pipe
The actuator releases with a push button and the union connections free the body, so either can be replaced without disturbing the soldered or pressed joint.
Technical Specifications
| Product Type | Motorized Zone Valve |
| Series | Z-one |
| Configuration | 2-Way |
| Connection type | Sweat |
| Connection size | 1-1/4" |
| Valve body | Z200737 |
| Actuator | Z151000 |
| Supplied components | Z151000 actuator, Z200737 valve body |
| Flow coefficient | 7.5 Cv |
| Max. close-off differential pressure | 20 psi |
| Max. static pressure | 300 psi (15 psi steam) |
| Medium temperature range | 32 - 240 deg F |
| Max. percentage of glycol | 50 % |
| Fail position | Normally Closed (spring return) |
| Electric supply | 24 V AC, 50/60 Hz |
| Power requirements | 5.0 W, 7 VA |
| Auxiliary microswitch | 0.0 - 0.4 A @ 24 V |
| Power connection | Screw terminal block |
| Full stroke time | Open: under 60 seconds / Close: 6 seconds |
| Close-off seat leakage | 100 % bubble-tight |
| Approvals | UL 873, cUL Listed, CE; UL 1995 sec. 18 air plenum and duct |
Specifications transcribed from Caleffi technical brochure 01115/23.1 NA and installation manual NA10073. Last verified August 2026.
Documentation
Related Products
- Caleffi Z50 : Z-one 2-Way Motorized Zone Valve, Inverted Flare, 3.5 Cv, 30 psi Close-Off, 24V AC Normally Closed Actuator with Auxiliary Microswitch, Screw Terminal Block
- Caleffi Z50F : Z-one 2-Way Motorized Zone Valve, 3/4" Sweat, 3.5 Cv, 30 psi Close-Off, 24V AC Normally Closed Actuator with Auxiliary Microswitch, Screw Terminal Block
- Caleffi Z54 : Z-one 2-Way Motorized Zone Valve, 1/2" Sweat, 2.5 Cv, 50 psi Close-Off, 24V AC Normally Closed Actuator with Auxiliary Microswitch, Screw Terminal Block
- Caleffi Z54P : Z-one 2-Way Motorized Zone Valve, 1/2" Press, 3.5 Cv, 30 psi Close-Off, 24V AC Normally Closed Actuator with Auxiliary Microswitch, Screw Terminal Block
Frequently Asked Questions
What is included with the Caleffi Z57?
A 24 V AC normally closed spring-return actuator with auxiliary microswitch and screw terminal block power connection, and a Z200737 valve body.
What connection does the Caleffi Z57 use?
1-1/4" Sweat. Other sizes and connection styles in the Z-one range are listed under Related Products.
What differential pressure will the Caleffi Z57 close against?
Up to 20 psi at 7.5 Cv, seating 100 percent bubble-tight.
- Product Type:
- Motorized Zone Valve
- Product Family:
- Z-one Zone Valves
- Configuration:
- 2-Way
- Connection Type:
- Sweat
- Connection Size:
- 1-1/4 inch
- Flow Coefficient:
- 7.5 Cv
- Max Close-Off Pressure:
- 20 psi
- Fail Position:
- Normally Closed
- Electric Supply:
- 24 V AC
- Auxiliary Microswitch:
- Yes
- Power Connection:
- Terminal Block
