Classification of hydraulic directional control valves

Manual Directional Control Valves:

1. Hand Lever Valve: Controls hydraulic flow direction by manually rotating or moving the lever, typically used for simple manual operations.
2. Handwheel Valve: Similar to hand lever valves but often has a larger handwheel for ease of operation.

Electric Directional Control Valves:

1. Solenoid Valve: Controls the valve’s on/off state using an electromagnetic coil and is suitable for remote or automatic control.
2. Electric Valve: Uses an electric motor or actuator to control hydraulic flow direction, typically used in applications requiring high precision.

Hydraulic Directional Control Valves:

1. Spool Valve: Controls hydraulic flow direction by moving the valve through hydraulic signals, typically used for bidirectional control in hydraulic cylinders.
2. Hydraulic Steering Valve: Controls the direction of hydraulic motors, commonly used in hydraulic-driven vehicles.
3. Servo Valve: Achieves highly precise position control through feedback mechanisms, typically used in high-precision applications such as CNC machine tools.

Mechanical Directional Control Valves:

1. Slide Valve: Alters hydraulic flow direction through the movement of mechanical components, typically used for simple manual or automatic control.
2. Rotary Valve: Controls hydraulic flow direction by rotating the valve body, often used in specific applications such as excavators.

Proportional Directional Control Valves:

1. Electro-Hydraulic Proportional Valve: Controls hydraulic flow direction in the hydraulic system using electronic signals, allowing for precise proportional control.
2. Hydraulic Proportional Valve: Adjusts the valve port size based on mechanical or hydraulic signals to achieve proportional control of hydraulic flow direction.

Multi-Way Valves:

1. Multi-Way Diverter Valve: Redirects hydraulic flow to multiple different actuators, typically used in multi-way control applications.
2. Multi-Channel Diverter Valve: Similar to multi-way diverter valves but with a more complex channel layout, enabling more control options.

The choice of the appropriate directional control valve depends on the requirements of the hydraulic system, including flow rate, pressure, precision, speed, and control method, among other factors.