The Belimo ZONE220S-35 is a 3/4 in. (DN 20) 2-way on/off zone valve body with sweat pipe connections, a Cv of 3.5 and a 30 psi close-off pressure rating. It has a forged brass body, EPDM seat and housing seal and a stainless steel stem, and it mounts Belimo ZONE spring return actuators. It is sold as the valve only, without an actuator.
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
- Replacing or stocking the valve body for a Belimo ZONE spring return actuator
Warranty
Belimo 2-year warranty on the ZONE220S-35.
Key Features
Built for ZONE Actuators
Valve body designed for Belimo ZONE spring return actuators for fail-safe operation on 2-wire control.
Forged Brass Body
Forged brass body, EPDM seat and housing seal, and stainless steel stem. 300 psi body pressure rating.
Cv 3.5, 30 psi Close-Off
On/off flow characteristic, Cv 3.5, 30 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].
Variable or Constant Flow
Suitable for hydronic systems with variable or constant flow, in compact fan coil and baseboard installations.
ZOT Supply is an authorized distributor of Belimo products.
Technical Specifications
| Valve: ZONE220S-35 | |
| Valve Size | 3/4 in. (0.75 in.), DN 20 |
|---|---|
| Flow Pattern | 2-way |
| Flow Characteristic | on/off |
| Cv | 3.5 |
| Close-Off Pressure | 30 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 |
| Weight | 0.66 lb [0.30 kg] |
Specifications sourced from the Belimo ZONE220S-35 technical data sheet (2023-01-10 edition) and the ZONE220S-35 valve section of the Belimo ZONE220S-35 assembly data sheets (2022-01-12 edition). Reviewed October 10, 2026.
Documentation
Technical Data Sheet: Belimo ZONE220S-35FAQ
What is the Cv of the Belimo ZONE220S-35?
The ZONE220S-35 valve in the Belimo ZONE220S-35 has a Cv of 3.5 and a close-off pressure of 30 psi. It is a 3/4 in. 2-way valve with an on/off flow characteristic.
What pipe connection does the Belimo ZONE220S-35 have?
The Belimo ZONE220S-35 has 3/4 in. sweat pipe connections on a forged brass valve body.
What fluids and temperatures can the Belimo ZONE220S-35 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.
Does the Belimo ZONE220S-35 include an actuator?
No. The Belimo ZONE220S-35 is the valve only. It is designed for Belimo ZONE spring return actuators.
What is the warranty on the Belimo ZONE220S-35?
Belimo covers the ZONE220S-35 with a 2-year warranty.
- Valve Pattern:
- 2-Way
- Valve Size:
- 3/4 Inch
- Connection Type:
- Sweat
- CV Rating:
- 3.5
- Max Close-Off Pressure:
- 30 psi
- Max Operating Pressure:
- 300 psi
- Medium Temperature Range:
- 32-212 °F
- Body Material:
- Forged Brass
- Actuator Type:
- Valve Only
