DeZurik APCO CAC-8000 Instruction - Page 8

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DeZurik APCO CAC-8000 Instruction
DeZURIK
APCO CAC-8000 Automatic Control Check Valve
Figure 4: Back Flow Control in Reverse Direction

Shut-Off Function

The ability to function as a shut-off valve is shown in Figure 5. The Valve disc is tightly closed when the
wormwheel is rotated clockwise to its closed position. In this position the wormwheel has locked the
segment gear and disc in the closed position and the disc cannot move regardless of pressure or any
changes in pressure on either side of the disc. The factor of pressure tightness as noted on the normal
flow side of the disc in Figure 5 (150 psi) is in reality a pressure differential factor. In other words, if the
pressure in the reverse flow direction against the disc is 100 psi, a pressure of 250 psi on the normal
flow side of the disc would be held.
D12000
Page 8
December 2012