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DeZURIK

APCO CAC-8000 Automatic Control Check Valve

Start-up Procedure

1. Observe Disc Position Indicator to be sure the disc inside the valve is fully closed and the

Hydro-pneumatic and Oil Reservoir tanks are in a vertical position. Check oil levels in these

tanks and fill, if necessary, up to the street elbow level located on the side of the tank with oil.

See

"Oil Filling

Note: The oil reservoir tank has a ¼" pipe plug in the top for shipping purposes only. Remove

this plug and screw in the ¼" Air Breather Cap (taped to the piping) to maintain the tank at

atmospheric pressure at all times.

2. Open each Flow Control Valve (#64) adjacent to the Cylinder (#63) as follows:

a. Open the top Flow Control Valve which controls the rate of opening, 4 turns counter-

clockwise from fully closed.

b. Open the bottom Flow Control Valve which controls the rate of closing, only 2½ turns

counter-clockwise from fully closed position. See

3. Turn Cushion Adjustment Screw, in the rod end of cylinder, 1½ turns counter-clockwise from

fully closed position. See

4. Set Timing Valve Cam (#94) so that the arrow on Cam is pointing to the center line of the

Timing Valve Roller while the disc is in the closed position. See

5. Manually or electrically turn the Slip Gear Operator, to set the Disc Position Indicator in the

check position. See

6. Pressurize Hydro-pneumatic Tank to 15 psi for first tests.

Note: At this point pumps may be started, but first throttle the gate or butterfly valve

downstream of the APCO Automatic Control Check Valve to 75% closed to minimize full column

reversal on pump stop.

7. Start pump and observe rate of disc opening time.

8. Stop pump and observe rate of disc closing time.

9. Repeat above trial runs and make necessary adjustments to Timing Valve, Flow Control Valve

and Cylinder Cushion to establish smooth three stage closure. Additionally during this

sequence of pump start and stops gradually open the gate or butterfly valve downstream of the

APCO Automatic Control Check Valve until it is fully open.

10. When a shutdown sequence is established resulting in a closure of the disc without excessive

pressure surge or check or shock, lock each Flow Control Valve knob in place; lock the set

screws on the Timing Valve Cam in place to prevent tampering of setting.

D12000

Procedure".

"Operation of Internal

"All Telling

Indicator".

Page 10

"Adjustment of Flow Control

Cushion".

"Timing Valve

Valve".

Operation".

December 2012