The Belimo ZONE215S-35 is a 1/2-inch two-way sweat zone valve body with a Cv of 3.5 and 30 psi close-off pressure, built for Belimo ZONE spring return actuators. It is sold as the valve only, without an actuator.
Forged brass body, stainless steel stem and EPDM seat, with a 300 psi body pressure rating and ANSI Class III 0.1% leakage, for chilled or hot water up to 50% glycol.
Specifications verified October 2026 against Belimo technical data sheet ZONE215S-35 (rev. 2023-01-10; valve page rev. 2022-01-12).
Best For
- Fan coil units and baseboards
- Hydronic zones that need fail-safe operation on 2-wire control
- Variable flow or constant flow hydronic systems
- Compact installations with limited space
- Chilled or hot water service with up to 50% glycol
Warranty
The valve carries a 2-year Belimo warranty.
Key Features
1/2 in. Sweat Connection
Two-way forged brass body with sweat ends, Cv 3.5.
Close-Off and Body Rating
30 psi close-off pressure with a 300 psi body pressure rating.
ANSI Class III Leakage
Leakage rate of ANSI Class III 0.1% with an EPDM seat.
Durable Materials
Forged brass body, stainless steel stem, EPDM seat and housing seal.
Wide Fluid Range
Chilled or hot water from 32 to 212°F [0 to 100°C], up to 50% glycol.
Pairs With ZONE Actuators
Mounts Belimo ZONE spring return actuators for fail-safe 2-wire on/off control.
ZOT Supply is an authorized distributor of Belimo products.
Technical Specifications
| Valve Model | ZONE215S-35 |
|---|---|
| Valve Size | 1/2 in. [DN 15] |
| Pipe Connection | Sweat |
| Flow Pattern | 2-way |
| Cv | 3.5 |
| Close-Off Pressure | 30 psi |
| Body Pressure Rating | 300 psi |
| Flow Characteristic | On/off |
| Leakage Rate | ANSI Class III 0.1% |
| Fluid | Chilled or hot water, up to 50% glycol |
| Fluid Temperature Range | 32...212°F [0...100°C] |
| Valve Body | Forged brass |
| Housing Seal | EPDM |
| Stem | Stainless steel |
| Seat | EPDM |
| Suitable Actuators | Belimo ZONE spring return actuators |
| Valve Weight | 0.88 lb [0.40 kg] |
| A (actuator width) | 4.0 in. [102 mm] |
|---|---|
| B (valve end to end) | 2.8 in. [70 mm] |
| C (pipe centerline to top) | 3.5 in. [89 mm] |
| D (overall height) | 4.3 in. [110 mm] |
| E / F (centerline to side) | 1.2 in. [30 mm] / 1.2 in. [31 mm] |
Frequently Asked Questions
What is the Cv and close-off pressure of the Belimo ZONE215S-35?
The ZONE215S-35 has a Cv of 3.5 and a close-off pressure of 30 psi. The valve body is rated for 300 psi.
Does the Belimo ZONE215S-35 include an actuator?
No. The ZONE215S-35 is the valve body only. It is designed for Belimo ZONE spring return actuators.
What leakage rate does the Belimo ZONE215S-35 have?
The ZONE215S-35 has an ANSI Class III leakage rate of 0.1% with an EPDM seat.
What pipe connection does the Belimo ZONE215S-35 use?
The ZONE215S-35 has 1/2 in. [DN 15] sweat connections in a 2-way pattern.
What fluids and temperatures can the Belimo ZONE215S-35 handle?
The ZONE215S-35 handles chilled or hot water with up to 50% glycol at fluid temperatures from 32 to 212°F [0 to 100°C].
What warranty comes with the Belimo ZONE215S-35?
The ZONE215S-35 carries a 2-year Belimo warranty.
- Valve Pattern:
- 2-Way
- Valve Size:
- 1/2 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
