The **18AR-12-R** typically refers to a high-performance **Micro-Solenoid Valve** often manufactured by companies like **Pneumadyne** (an Excelon company). These components are critical in precision pneumatic control systems. --- ### 1. Technical Specifications The part number defines the physical and electrical characteristics of the valve. Below is a breakdown of the standard specifications for this series: | Feature | Specification | | :--- | :--- | | **Valve Type** | 3-Way Normally Closed (NC) | | **Voltage** | 12V DC | | **Power Consumption** | ~0.6 to 1.0 Watts (Low Power) | | **Operating Pressure** | 0 to 105 PSI (Standard range) | | **Connection Type** | Radial (R designation) | | **Orifice Size** | 0.025" to 0.030" (Typical) | | **Response Time** | <10 milliseconds | --- ### 2. Breakdown of the Part Number * **18**: Refers to the **10mm or 15mm series** (specifically the 15mm width category for this line). * **AR**: Indicates the **Actuator/Valve style** (often Air-Operated or specialized solenoid mounting). * **12**: Specifies the **Coil Voltage** (12 Volts DC). * **R**: Indicates the **Radial** orientation or porting configuration (how the air/wires exit the unit). --- ### 3. Key Electronic Components As an electromechanical device, the 18AR-12-R contains several internal electronic/magnetic parts: 1. **Solenoid Coil:** A spool of fine copper wire that creates a magnetic field when 12V DC is applied. 2. **Armature/Plunger:** A ferrous metal component moved by the magnetic field to open or close the air passage. 3. **Return Spring:** Ensures the valve returns to its "Normally Closed" state when power is removed. 4. **Terminals/Leads:** Electrical contact points for integrating the valve into a PCB or wiring harness. --- ### 4. Common Applications Due to its small footprint and low power draw, this part is frequently used in: * **Medical Equipment:** Oxygen concentrators and blood pressure monitors. * **Robotics:** Small-scale pneumatic grippers and actuators. * **Industrial Automation:** Pilot valves for larger pneumatic cylinders. * **Laboratory Instrumentation:** Precise fluid or gas sampling. ---