Troubleshooter
Spool type
Directional valves are used to start, stop and change the direction of fluid flowing through a hydraulic system.
Although they may be designed as rotary or poppet style, the spool type directional control is the most common.
Advantages of dcv spool type
The directional spool valve has many advantages, such as:
- Simple construction
- Good pressure compensation, hence low operating forces
- High operating power
- Low losses
- Variety of control functions
Function of spool
The spool moves within the valve housing to connect inlet and outlet ports. Spools consist of a shaft with large diameters on them called ,,lands’’. The number of lands varies dependent on the number of passage, and the function it is performing. The spool also has balancing grooves that acts as lubrication groves to reduce friction and to allow the spool to move freely.
DCV spools can be moved into two or three positions, and the valves are 2/2, 3/2, 4/2 or 4/3 type.
Directional spool valves may be either direct or pilot operated. Whether a valve is direct or pilot operated, primarily depends on the required operating force and hence the size of the valve.
- The spool type directional control is the most common one;
- The spool moves within the valve housing to connect inlet and outlet ports;
- Depends on the number of flow paths to be controlled, the spool can be moved two or more position;
- Directional spool valves may be either direct or pilot operated.
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