Description
The Belimo ZONE320S-35 is a factory-assembled, 3-way sweat zone valve and actuator combination engineered for precise hydronic zone control in residential and light commercial heating and cooling systems. Designed for easy installation and long-term reliability, this unit integrates Belimo’s proven actuator technology with a high-quality sweat-connection valve body, eliminating the need for separate valve and actuator sourcing.
Product Overview
The ZONE320S-35 features a 3/4″ sweat (solder) connection valve body in a 3-way configuration, making it ideal for diverting or mixing applications in hydronic systems. With a Cv of 1.8, it delivers accurate and consistent flow control suited for fan coil units, zone circuits, and terminal unit applications.
Key Features
- 3-way valve body in a 3/4″ sweat (solder) connection configuration
- Cv flow coefficient of 1.8 for precise hydronic flow regulation
- Factory-assembled valve and actuator combination for simplified installation
- Suitable for both diverting and mixing hydronic applications
- Compact, space-saving design ideal for tight mechanical spaces
- Belimo’s industry-leading actuator technology for dependable, long-life operation
- Manual override function for commissioning and service convenience
- Meets applicable UL and CE safety certifications standard to Belimo zone valve assemblies
Typical Applications
- Residential and light commercial hydronic zoning systems
- Fan coil unit (FCU) flow control
- Terminal unit heating and cooling circuits
- Chilled water and hot water distribution systems
- Two-pipe and four-pipe hydronic systems
Why Choose Belimo
Belimo is a globally recognized leader in actuator, valve, and sensor solutions for HVAC systems. The ZONE320S series is engineered to deliver consistent performance, reduced installation time, and lower total cost of ownership — making it a trusted choice for HVAC contractors and building engineers alike.







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