Directional Control Valves Classification by Operation Method and Spring Arrangement

These valves are classified according to the function, operation method, and spring arrangement. The operation method is classified into: manual, mechanical, hydraulic, solenoid-operated, electro-hydraulic, and pneumatic. The spring arrangement is classified into: spring offset for the two-position type, spring centered for the three-position type, and no spring for both two- and three-position types. The no-spring type includes the detent type, which holds the spool position at a certain position. Table 4.3 shows classification of the valves according to the operation method and spring arrangement.

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