DeZurik APCO CVS-250A Gebruiksaanwijzing - Pagina 10

Blader online of download pdf Gebruiksaanwijzing voor {categorie_naam} DeZurik APCO CVS-250A. DeZurik APCO CVS-250A 16 pagina's. Swing check valves

DeZURIK

APCO CVS-250/250A Swing Check Valves

Operation

(Continued)

Start-up Procedure

1. Ensure the Counterweight Arm (B19) is angled 30° below the horizontal.

2. Throttle down mainline isolation valve (furnished by others) on discharge side of Swing Check

Valve to approximately 1/3 open to prevent severe slamming during initial pump shutdown

testing.

3. Position Counterweight (B29) midway on the lever and lock in place.

4. If valve has an Air Cushion: Turn adjusting screw of flow control valve two (2) turns

counterclockwise from fully closed position.

5. Start and stop pump and observe rate of closing.

Adjustment (Valves with Air Cushion with Lever & Weight)

Condition

Turn adjusting screw of Flow Control Valve one-half (1/2) turn clockwise. Repeat

Check valve slams

start and stop. If slam persists, continue turning adjusting screw in ½ turn

increments. Be careful not to fully close Flow Control Valve.

Slam persists

Move weight towards end of lever a couple of inches. Repeat start and stop.

Continue repeating above steps until satisfactory closing is achieved. Then

Slam still persists

increase opening discharge isolation valve to ½ open. Repeat start and stop

pump sequence and above steps until isolation valve is full open.

Adjustment (Valves with Lever & Weight)

Condition

Check valve slams

Move weight towards end of lever a couple of inches. Repeat start and stop.

Slam persist

Repeat above step.

Notes:

1. Testing must conducted carefully and adjustments made in small increments to arrive at the optimum

where the swing check valve shuts off just prior to or at zero reverse flow.

2. The APCO CVS-250/250A Swing Check Valve is not a silent closing check valve.

D12003

Adjustment

Page 10

October 2018