DeZurik APCO CAC-8000 Інструкція - Сторінка 15
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DeZURIK
APCO CAC-8000 Automatic Control Check Valve
Adjustment of Flow Control Valves
The Flow Control Valve has a micrometer type adjustment which incorporates a color coded reference
scale to simplify setting, resetting and adjusting. See Figure 9.
A lock nut is provided for locking the valve setting. Turning the valve clockwise closes the valve and
turning counter-clockwise opens the valve and increases rate of closure of the check valve.
Figure 9: Flow Control Valve
Operation of Internal Cushions
The cushioning of a hydraulic cylinder stroke is obtained by trapping the exhaust fluid as the piston
assembly nears the end of its stroke. In Figure 10: As the Cushion Plunger (1) enters cushion cavity
(2) the exhaust fluid is almost completely trapped by the Ball Check (3) and the Adjusting Screw (4),
creating a back pressure against Piston Assembly. The back pressure cushions and slows the final
part of the piston stroke, thus, reducing the high impact hammering of the Piston Assembly against the
cylinder cap. Turning the Adjusting Screw (4) to allow more or less fluid to escape regulates the degree
of cushioning as desired.
In Figure 11: When pressurized fluid enters the Cylinder Cap End to stroke the Piston Assembly in the
opposite direction, the pressure fluid moves the ball check (3) off its seat, opening the passage for
more fluid to act against the piston, thus speeding its start-up movement as the Cushion Plunger (1) is
immediately forced out of its cavity (2).
December 2012
Page 15
D12000