DeZurik APCO CVS-6000 Handbuch für Installation, Betrieb und Wartung - Seite 10

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DeZURIK

APCO CVS-6000 Swing Check Valves

Start-up Procedure (CVS-6000B Valves)

6. Start pump. While valve is opening, visually verify that Buffer Rod (84) fully extends into the

valve body. If not, pressurize Hydro-pneumatic tank until it does. Table A shows the maximum

stroke length of the Buffer Rod.

Table A:

Maximum Stroke Length of Buffer Rod

Valve Size

Stroke, (inches)

7. Shut-off pump and observe rate of closing.

8. Using the above trial run as a basis, make necessary adjustments on the internal cushion and

Flow Control Valve connected to the hydro-pneumatic accumulator to suit pipeline

requirements. Turning the knob clockwise slows down rate of closure of the disc, and turning it

counterclockwise increases the speed of closing of the valve.

9. Tighten lock nut or set screw under flow control valve knob when final setting is made to prevent

tampering of settings.

Start-up Procedure (CVS-6100 Valves)

1. Position counterweights (29) midway on the lever.

2. Remove pipe plug on top of oil reservoir (58) and install Air Breather, which is shipped with the

valve.

3. Check for proper oil levels. Make sure oil tank is in vertical position. The oil level should be

checked when the valve is closed. Oil should be visible in the elbow, which is the oil fill level.

Add if necessary. (See "Oil Filling Procedure").

4. Open flow control valve (30) three complete turns counter-clockwise from fully closed position.

See "ADJUSTMENT OF FLOW CONTROL VALVE".

5. Turn cushion adjustment screw two complete turn counter-clockwise from fully closed position.

"SEE OPERATION OF INTERNAL CUSHION"

6. Set timing valve cam (47) so that arrow on cam is pointing to the center line of the timing valve

roller while the disc is in closed position. See "TIMING VALVE OPERATION".

7. Start and stop pump and observe rate of closing. Throttle down mainline gate valve (furnished

by others) on discharge side of the Swing Check Valve to approximately 1/2 open to minimize

full column reversal on pump stop.

8. Using the above trial run as a basis, make necessary adjustments to the Timing Valve, Flow

Control Valve and the internal cushion of the cylinder to establish smooth three stage closure.

During this sequence of pump start and stops, gradually open the mainline gate valve

downstream until it is full open.

9. When shut-down sequence is established resulting in a closure of the disc without excessive

pressure surge or slam, lock the Flow Control Valve knob and tighten Timing Valve set screws

to prevent tampering of settings.

D12006

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18"

20"

24"

30"

36"

42"

48"

54" 60"

December 2012

66"