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 TM 55-1905-219-14-7
3-208. DIRECTIONAL CONTROL VALVE - MAINTENANCE INSTRUCTIONS
A.
GENERAL
The directional control valve is comprised of a rectangular valve body containing a precision fitted sliding spool
in a central, longitudinal bore. Spool lands serve to divide the bore into a series of separate chambers, and ports in the
valve body lead into these chambers. The position of the spool determines which ports are open to each other and which
are sealed off from the others. Thus, oil flow is directed from one port to another within the valve body.
B.
PRINCIPLES OF OPERATION
1. Valve Type:
SPRING CENTERED - Spring centered valves are provided with a spring and centering washer at each end of
the spool. The springs and washers center the spool within the valve body, when solenoids are de-energized.
2. Function
Three cross section views of a valve are shown. The cross sections show location of the spoolands and the
basic valve block machining. Each cross section is provided to show porting of the valve as the spool is moved within the
valve block. Assume the spool is moved to the left within the valve body. The "P" pressure port will connect to the "A"
cylinder port and the "B" cylinder port will open to the "T" tank port.
3-3216
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