The **ALV-111-R** is a specific model of an electronic valve actuator, typically used in HVAC systems (Heating, Ventilation, and Air Conditioning) to control the flow of water or steam by regulating globe valves. Below is a breakdown of its electronic components and technical specifications. --- ### 1. Core Technical Specifications The electronic performance of the ALV-111-R is defined by its power requirements and signal processing capabilities. | Feature | Specification | | :--- | :--- | | **Input Voltage** | 24V AC (50/60 Hz) or 24V DC | | **Power Consumption** | 2.5 VA to 4.0 VA (during operation) | | **Control Signal** | 2-Position (On/Off) or Floating (3-point) | | **Stroke Time** | ~150 seconds (at 60Hz) | | **Nominal Force** | 100N to 150N (Newton) | --- ### 2. Key Electronic Components #### A. Synchronous Motor The "heart" of the actuator is a small AC synchronous motor. * **Function:** It converts electrical energy into rotational kinetic energy. * **Characteristics:** These motors run at a constant speed proportional to the line frequency, ensuring predictable timing for opening and closing the valve. #### B. Limit Switches (End-of-Travel) Internally, the ALV-111-R contains micro-switches. * **Purpose:** They detect when the actuator has reached its fully extended or fully retracted position. * **Protection:** Once the limit is hit, the switch cuts power to the motor to prevent overheating or mechanical stripping of the gears. #### C. Gear Train (Mechanical-Electronic Interface) While primarily mechanical, the gear train is essential for the electronic operation. It reduces the high-speed motor rotation to a high-torque, slow-speed linear motion required to push the valve stem. #### D. Connection Terminals The unit features a terminal block for wiring: * **Common (N):** The neutral or ground wire. * **Directional Inputs (L):** Usually two separate terminals for "Clockwise" (Open) and "Counter-Clockwise" (Close) signals. --- ### 3. Operational Logic The ALV-111-R operates on **Reversible Logic**. Unlike spring-return actuators, it requires an electrical signal to move in *both* directions. If power is lost, the valve remains in its last known position (Fail-in-place). ### 4. Wiring Diagram Overview Typical wiring involves three wires: 1. **Wire 1:** Common. 2. **Wire 2:** Power to extend the actuator. 3. **Wire 3:** Power to retract the actuator. ---