resideo 24V 1-inch welded NC zone valve V8043E1020

**Product Overview**  

The Resideo V8043E1020 is a 24V AC normally closed (NC) zone valve designed for hydronic heating and cooling systems. It features a durable 1-inch NPT threaded connection with a welded construction, ensuring reliable flow control in residential and light commercial applications. This motor-driven valve operates in on/off mode to regulate hot or chilled water flow through individual zones, contributing to improved system efficiency and comfort management.

**Technical Specifications**  

- **Model:** V8043E1020  

- **Voltage:** 24V AC, 50/60 Hz  

- **Valve Type:** Normally Closed (NC) – closes on power loss  

- **Connection Size:** 1 inch NPT (female threaded)  

- **Body Material:** Brass with welded construction  

- **Actuator Type:** Synchronous motor with thermal feedback  

- **Operating Pressure:** Up to 150 psi (10.3 bar)  

- **Maximum Fluid Temperature:** 240°F (116°C)  

- **Fluid Compatibility:** Water, glycol mixtures (max 50% glycol)  

- **Close-off Pressure:** 30 psi (2.1 bar)  

- **Power Consumption:** 4.8 VA (typical)  

- **Stroke Time:** Approximately 30 seconds (full open to close)  

- **End Switch Rating:** 1.0 A at 24V AC, SPST (for auxiliary control)  

- **Installation Position:** Any orientation; actuator must be above pipe  

- **Ambient Temperature Limit:** Up to 140°F (60°C)  

- **Standards Compliance:** Meets applicable UL and CSA standards  

**Design & Features**  

The valve body is constructed from robust brass with a welded design, providing enhanced leak resistance and long-term durability under typical system pressures. The synchronous motor actuator includes an internal thermal feedback mechanism that automatically prevents overheating by cutting power once the valve reaches its fully open or closed position. An integrated auxiliary end switch can be used to signal valve position or activate secondary system components such as a circulator pump. The normally closed design ensures fail-safe closure during power interruptions, preventing unintended flow.

**Typical Applications**  

- Residential and light commercial hydronic heating systems  

- Zone control for baseboard, radiator, or fan coil units  

- Chilled water distribution in cooling applications  

- Integration with zone control panels, thermostats