ZONE225N-80 Overview
The Belimo ZONE225N-80 is a 2-way, 1 in. NPT on/off zone valve body with a forged brass body, EPDM seat and a Cv of 8, rated for 300 psi body pressure and 20 psi close-off, for use with Belimo ZONE spring return actuators.
It is built for fan coil units, baseboards and other hydronic applications where fail-safe operation on 2-wire control is required, in systems with variable or constant flow, and handles chilled or hot water with up to 50% glycol from 32 to 212°F.
The valve body has NPT female connections, a stainless steel stem and EPDM seat and housing seal, with ANSI Class III 0.1% leakage.
Best For
- Fan coil units, baseboards and other hydronic terminal equipment
- Applications that need fail-safe operation on 2-wire control
- Hydronic systems with variable or constant flow
- Chilled or hot water service with up to 50% glycol
- Replacing or stocking a 1 in. ZONE valve body separately from the actuator
Warranty
The Belimo ZONE225N-80 carries a 2-year Belimo warranty.
Key Features
Forged Brass Valve Body
300 psi body pressure rating, Cv 8, 20 psi close-off and ANSI Class III 0.1% leakage.
EPDM Seat and Seals
EPDM seat and housing seal with a stainless steel stem.
Wide Fluid Range
Chilled or hot water up to 50% glycol, 32 to 212°F [0 to 100°C].
NPT End Connections
1 in. [DN 25] NPT female ends.
Pairs With ZONE Actuators
Accepts Belimo ZONE spring return actuators.
Compact Design
Designed to fit in compact areas where on/off control is required.
ZOT Supply is an authorized distributor of Belimo products.
Technical Specifications
| Valve (ZONE225N-80) | |
|---|---|
| Valve model | ZONE225N-80 |
| Valve size | 1 in. [DN 25] |
| Flow pattern | 2-way |
| Flow characteristic | On/off |
| Cv | 8 |
| Fluid | Chilled or hot water, up to 50% glycol |
| Fluid temperature range | 32 to 212°F [0 to 100°C] |
| Body pressure rating | 300 psi |
| Close-off pressure | 20 psi |
| Leakage rate | ANSI Class III 0.1% |
| Valve body | Forged brass |
| Housing seal | EPDM |
| Stem | Stainless steel |
| Seat | EPDM |
| Pipe connection | NPT female ends |
| Valve weight | 1.32 lb [0.60 kg] |
Documentation
Frequently Asked Questions
What is the Cv and close-off pressure of the Belimo ZONE225N-80?
The ZONE225N-80 has a Cv of 8 in a 1 in. 2-way valve body, a 20 psi close-off pressure, a 300 psi body pressure rating and ANSI Class III 0.1% leakage.
Which actuators fit the Belimo ZONE225N-80 valve body?
Belimo ZONE spring return actuators. ZOT Supply also carries the ZONE225N-80 in assemblies with Belimo ZONE24, ZONE120 and ZONE230 actuators.
What fluids and temperatures can the Belimo ZONE225N-80 handle?
Chilled or hot water with up to 50% glycol, from 32 to 212°F [0 to 100°C].
What end connections does the Belimo ZONE225N-80 have?
1 in. [DN 25] NPT female ends.
How should the Belimo ZONE225N-80 be installed?
Install the valve vertically or horizontally, but not upside down. Flow is from port A to port B, and the valve must be installed so the paddle closes against the direction of flow. The 2-way valve can go on the supply or the return, following the flow arrow on the valve body.
Specifications verified against Belimo ZONE225N-80 technical data sheet (2023-01-10), the ZONE225N-80 section of the Belimo assembly data sheets (2022-01-12) and Belimo installation instructions 70264-00001E. Reviewed 2026-10-09.
- Valve Pattern:
- 2-Way
- Valve Size:
- 1 Inch
- Connection Type:
- NPT
- CV Rating:
- 8.0
- Max Close-Off Pressure:
- 20 psi
- Max Operating Pressure:
- 300 psi
- Medium Temperature Range:
- 32-212 °F
- Body Material:
- Forged Brass
- Actuator Type:
- Valve Only
