Pneumatic solenoid valves are classified into several types based on their operation, configuration, and application. Here are the main types:
1. **Direct Acting Solenoid Valves**: These valves directly control the flow of air by opening or closing the valve with the movement of the solenoid. They are typically used in small applications with low flow rates.
2. **Pilot Operated Solenoid Valves**: These valves use the solenoid to pilot a larger valve, which allows for controlling higher flow rates or pressures. They are common in larger pneumatic systems.
3. **2-Way Solenoid Valves**: These have two ports, one inlet and one outlet. They can be normally closed (NC) or normally open (NO), and they control the flow of air between the two ports.
4. **3-Way Solenoid Valves**: These valves have three ports and are used to control the flow of air in one of two paths. They are often used to operate single-acting cylinders.
5. **4-Way Solenoid Valves**: Commonly used in double-acting cylinder operations, these valves have four or five ports and control the direction of airflow to different actuator chambers.
6. **5-Way Solenoid Valves**: Similar to 4-way valves but with an additional exhaust port. They are also used in applications where precise control of air flow direction is required.
7. **Proportional Solenoid Valves**: These valves offer variable control of flow rate rather than just on/off control. They are used in applications requiring precise adjustment of pressure or flow.
8. **ISO Valves**: These are standardized solenoid valves that conform to ISO 5599/1. They are typically used in industrial applications where interoperability and standardization are critical.
Each type of valve is chosen based on the specific needs of the pneumatic system, including factors like flow rate, pressure, and control precision【6†source】【7†source】.
