The Belimo ZONE220S-50+ZONE230NO is a 3/4 in. (DN 20) 2-way on/off zone valve assembly: a ZONE220S-50 forged brass valve with sweat ends, Cv 5 and 25 psi close-off, paired with a ZONE230NO AC 230 V normally open spring return actuator for fail-safe operation on 2-wire control.
Best For
- Fan coil units
- Baseboard heating
- Other hydronic zone applications where fail-safe operation on 2-wire control is required
- Hydronic systems with variable or constant flow
- Compact installations that need on/off zone control
- On/off control from a thermostat or controller switching AC 230 V
Warranty
Belimo 2-year warranty on the ZONE220S-50+ZONE230NO.
Key Features
Spring Return Fail-Safe
Normally Open spring return actuator for fail-safe operation on 2-wire on/off control. Fail-safe running time <5 s.
Forged Brass Body
Forged brass body, EPDM seat and housing seal, and stainless steel stem. 300 psi body pressure rating.
Cv 5, 25 psi Close-Off
On/off flow characteristic, Cv 5, 25 psi close-off pressure and ANSI Class III 0.1% leakage.
Sweat Connections
3/4 in. (DN 20) sweat ends for chilled or hot water, up to 50% glycol, at 32...212°F [0...100°C].
cULus and CE Listed
CE, cULus listed actuator, manufactured under ISO 9001, NEMA 1 / UL Enclosure Type 1, maintenance-free.
ZOT Supply is an authorized distributor of Belimo products.
Technical Specifications
| Valve: ZONE220S-50 | |
| Valve Size | 3/4 in. (0.75 in.), DN 20 |
|---|---|
| Flow Pattern | 2-way |
| Flow Characteristic | on/off |
| Cv | 5 |
| Close-Off Pressure | 25 psi |
| Body Pressure Rating | 300 psi |
| Leakage Rate | ANSI Class III 0.1% |
| Fluid | chilled or hot water, up to 50% glycol |
| Fluid Temperature Range (Water) | 32...212°F [0...100°C] |
| Pipe Connection | Sweat |
| Valve Body | forged brass |
| Housing Seal | EPDM |
| Stem | stainless steel |
| Seat | EPDM |
| Suitable Actuators | Belimo ZONE spring return |
| Actuator: ZONE230NO | |
| Nominal Voltage | AC 230 V |
| Nominal Voltage Frequency | 50/60 Hz |
| Power Consumption in Operation | 6.5 W |
| Transformer Sizing | 7 VA |
| Control | On/off, 2-wire |
| Normal Position | Normally Open (NO) |
| Electrical Connection | 6 in. wire leads |
| Angle of Rotation | 90° |
| Running Time Fail-Safe | <5 s |
| Noise Level, Motor | 35 dB(A) |
| Noise Level, Fail-Safe | 35 dB(A) |
| Degree of Protection IEC/EN | IP20 |
| Degree of Protection NEMA/UL | NEMA 1 |
| Enclosure | UL Enclosure Type 1 |
| Agency Listing | CE, cULus |
| Quality Standard | ISO 9001 |
| Ambient Temperature | 32...104°F [0...40°C] |
| Storage Temperature | -40...176°F [-40...80°C] |
| Ambient Humidity | Max. 95% RH, non-condensing |
| Servicing | maintenance-free |
| Housing Material | galvanized steel |
Specifications sourced from the Belimo ZONE220S-50+ZONE230NO technical data sheet (2022-01-12 edition). Reviewed October 10, 2026.
Documentation
Technical Data Sheet: Belimo ZONE220S-50+ZONE230NOInstallation Instructions: ZONE Series Zone ValvesFAQ
What is the Cv of the Belimo ZONE220S-50+ZONE230NO?
The ZONE220S-50 valve in the Belimo ZONE220S-50+ZONE230NO has a Cv of 5 and a close-off pressure of 25 psi. It is a 3/4 in. 2-way valve with an on/off flow characteristic.
What pipe connection does the Belimo ZONE220S-50+ZONE230NO have?
The Belimo ZONE220S-50+ZONE230NO has 3/4 in. sweat pipe connections on a forged brass valve body.
What fluids and temperatures can the Belimo ZONE220S-50+ZONE230NO handle?
It is rated for chilled or hot water, up to 50% glycol, with a fluid temperature range of 32...212°F [0...100°C] and a 300 psi body pressure rating.
What voltage does the ZONE230NO actuator on the Belimo ZONE220S-50+ZONE230NO use?
The ZONE230NO runs on AC 230 V, 50/60 Hz. It draws 6.5 W in operation; size the transformer at 7 VA.
Is the Belimo ZONE220S-50+ZONE230NO normally open or normally closed?
The Belimo ZONE220S-50+ZONE230NO uses the ZONE230NO, the normally open (NO) version of the Belimo ZONE spring return actuator, for on/off control on 2 wires.
What wiring connection does the ZONE230NO have?
The ZONE230NO has 6 in. wire leads.
What is the warranty on the Belimo ZONE220S-50+ZONE230NO?
Belimo covers the ZONE220S-50+ZONE230NO with a 2-year warranty.
- Valve Pattern:
- 2-Way
- Valve Size:
- 3/4 Inch
- Connection Type:
- Sweat
- CV Rating:
- 5
- Actuator Type:
- Fail-Safe
- Voltage:
- 230VAC
- Control Signal:
- On/Off
- Auxillary Switch:
- None
