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A **solenoid valve** is an electromechanically operated valve that controls the flow of liquids or gases by using an electric current to actuate a solenoid (electromagnetic coil). When energized, the solenoid generates a magnetic field, which moves a plunger or pivoting armature to open or close the valve, allowing or blocking fluid flow.
#### **Key Features:**
- **Fast response time** - Can switch states (open/close) in milliseconds.
- **Reliable operation** - Minimal mechanical wear due to no physical contact in some designs.
- **Versatile applications** - Used in hydraulic, pneumatic, water, oil, and gas systems.
- **Different configurations** - Normally open (NO), normally closed (NC), or bistable (latching).
- **Energy-efficient options** - Low-power models available for battery-operated systems.
#### **Common Types:**
1. **Direct-acting solenoid valve** - The solenoid directly moves the valve mechanism (suitable for low flow rates).
2. **Pilot-operated solenoid valve** - Uses system pressure to assist in opening/closing (ideal for high flow/pressure).
3. **Proportional solenoid valve** - Allows variable flow control by adjusting current input.
4. **Explosion-proof solenoid valve** - Designed for hazardous environments (ATEX/IECEx certified).
#### **Typical Applications:**
- Industrial automation (pneumatic/hydraulic systems)
- Water and irrigation control
- Fuel and gas shut-off systems
- Medical and laboratory equipment
- HVAC and refrigeration systems
#### **Technical Specifications (Example):**
- **Voltage:** 12V DC, 24V DC, 110V AC, 220V AC
- **Port Size:** 1/8" to 2" (or metric equivalents)
- **Pressure Range:** 0-300 psi (or higher for hydraulic variants)
- **Material:** Brass, stainless steel, or plastic (for corrosion resistance)
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