Watts FV-4M1 Automatic Air Vent Valve – Brass
The Watts FV-4M1 Automatic Air Vent Valve is designed to automatically remove trapped air from hot and cold water distribution systems. It uses a float-operated mechanism that opens to release accumulated air and closes when water reaches the valve seal, helping prevent water leakage. The valve can also provide vacuum-breaking functionality and assist in air separation during fluid circulation, depending on the installation configuration. It features a brass body and cover, a silicone rubber seal, and a high-temperature-resistant polyethylene float. Suitable for glycol systems, it can be disassembled for inspection and cleaning. Available in sizes from DN3 to DN25, with a maximum working pressure of 10 bar and an operating temperature range of 5°C to 116°C.
Technical Specifications
| Float Material | High-Temperature-Resistant Polyethylene |
|---|---|
| Size Range | DN3–DN25 |
| Minimum Working Pressure | 10 kPa (0.1 bar / 1.45 psi) |
| Maximum Working Pressure | 10 bar (150 psi) |
| Temperature Range | 5°C to 116°C |
| Suitable Fluids | Hot Water, Cold Water, Glycol Systems |
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