Val-Matic Tilted Disc Check Valve - Manual (Page 15)

14
CAUTION
Flow control valves should not be used at
settings below the blue band (second from the
bottom). Lower settings will allow small
particles of silt present in the hydraulic fluid to
clog the valve and cause the BMOD to bind and
result in damage to the valve or dashpot.
OPTIONAL TOP DASHPOT (Cont’d)
Figure 9. Adjustment of Flow Control Valve
7. Leakage of Oil: Wipe down controls and Identify
location of leak. Tighten fittings where needed.
Check that cylinder rod is clean with no paint or
buildup. Cylinder seal kits can be used if cylinder
leakage persists. An air tank pressure of at least
10 psi is needed to energize the rod seals.
8. Leakage of Water through Dashpot: Replace
seals (42) and (43) in bushing assembly.
FLOW CONTROL VALVE ADJUSTMENT: Flow
control valves are specialized needle valves that
allow free flow in one direction and controlled flow in
the other direction. They are used to control the flow
out of hydraulic cylinders. Hence, the “Controlled
Flow” arrow marked on the valve must point away
from the cylinder.
The flow control valve has color-coded bands and a
numbered dial that allows the operator to make fine
adjustments to the valve operating speed. Turning
the numbered dial clockwise will close the flow
control valve. The exposed color bands just below
the bottom of the dial indicate the flow control
position. The red band on the bottom represents the
valve’s full open position. The flow control valve can
be adjusted in increments of 1/10 of a turn by
aligning the numbers (0 through 9) on the dial, with
the scribed line on the flow control valve body. One
full revolution of the knob will expose or remove a
color band. Do not be used at settings below the
blue band or clogging may occur. After all
adjustments are made, the set screw should be
locked into place to prevent accidental changes in
the flow control valve setting.