DeZurik APCO 100SA Installation, Operation And Maintenance Manual - Page 9
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DeZURIK
APCO CRF Rubber Flapper Swing Check Valves
Adjustment of Flow Control Valve
(Continued)
Figure 3 - Flow Control Valve
Operation of Internal Cushion
As illustrated below, 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 4, as the Cushion Plunger (1) enters
Cushion Cavity (2), the exhaust fluid is almost completely trapped by the Ball Check (3) and 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 to allow more or less fluid to escape regulates the degree of cushioning as
desired.
In Figure 5, when pressurized fluid enters the Cylinder Cap End to strike 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).
Figure 4 - Cushion "IN" Stroke
Figure 5 - Cushion "OUT" Stroke
December 2012
Page 9
D12007