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 TM 55-1905-220-34P
3-137.9. DIRECTIONAL CONTROL VALVE - MAINTENANCE INSTRUCTIONS.
(Continued).
(3) VALVE SPOOLS
Each spool is constructed for a specific valve application and is dynamically and hydrostatically balanced
to prevent pressure forces from moving the spool within the bore. The spool used is a four-way type.
(4) METHODS OF CONTROL
SOLENOID - Push type solenoids are used to control movement of the spool. A manual plunger is
available in each solenoid to check spool movement during test. Push-type solenoids move the spool away
from the solenoid when energized.
When a valve uses two solenoids, only one solenoid should be energized at a
time or damage may result.
3-2262
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