DeZurik APCO CVS-6000 Посібник з монтажу, експлуатації та технічного обслуговування - Сторінка 12
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DeZURIK
APCO CVS-6000 Swing Check Valves
Timing Valve Adjustment (Series 6100 Valves)
The Timing Valve is an extremely reliable and convenient means to automatically open or close the oil
passage. The built-in roller is activated by the Timing Valve Cam, causing a resultant movement of the
Timing Valve stem to open or close the oil passage. The Timing Valve is closed when the roller is fully
extended and it is open when the roller is depressed.
The Timing Valve roller when depressed, permits oil to flow directly from the Dashpot Cylinder (20) to
the atmospheric Oil Reservoir bypassing the Flow Control Valve (30). The unrestricted flow of oil,
allows virtually instant movement of the piston and extremely rapid closure of the Disc (10). The time
period of disc closure is achieved by adjusting the contact distance between the Timing Valve cam and
the Timing Valve roller.
• Turning the cam counter-clockwise will increase the length of contact between the cam roller
and the cam, permitting the disc to close at a fast rate from its full open position.
• Turning the cam clockwise will decrease the length of contact, permitting the disc to close at a
slower rate from its full open position.
• If the cam and cam follower are adjusted so as not to make contact with each other, the
secondary control which is the Flow Control Valve will fully control the disc movement from full
open to 90% closed.
Figure 5 shows position of cam in relation to cam follower with check valve in closed position. Cam is
set to rapidly close from full open to 50% open. Check valve disc opens and turns counterclockwise.
The cam which is fastened to the same pivot shaft as disc arm also turns in the same direction.
D12006
Figure 5 – Timing Valve
Page 12
December 2012