DeZurik APCO CVS-250A Instruction Manual - Page 8
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DeZURIK
APCO CVS-250/250A Swing Check Valves
Maintenance
(Continued)
15. Slide the Flanged Bushing (A12), on 4" and larger valves over the Pivot Shaft (A13) and into the
Body (A01).
16. Install one Packing Ring (A17) at a time. Make sure it is clean and has not picked up any dirt in
handling before installing it. Lubricate I.D. of each packing ring. Joints of successive rings
should be staggered at least 90 degrees apart. Each ring should be firmly seated with a tamping
tool.
17. Install the Studs (A49), Packing Gland (A37), Washers (A50), Nuts (A54) and adjust packing.
18. Install the Pivot Shaft Cover (A15) with Screws (A16) and Washers (A50).
19. Install the Cover (A02) to the Body (A01) with Eye Nuts (A64), Nuts (A52), Screws (A04) and
Washers (A51).
20. If the valve is equipped with an Air Cylinder (B20):
a. Install the Cushion Lever (B27) and Key (B34) on the Pivot Shaft (A13). Secure to Pivot
Shaft by tightening Cushion Lever Screw.
b. Install the Cushion Cylinder (B20) and Bracket (B24) assembly to the Body (A01) using
Hex Bolts (B21) and Washers (B22).
c. Install the Retaining Rings (B60) and Clevis Pin (B59) to secure the Cushion Arm to the
cylinder rod eye.
21. Install Counter Weight Arm (B19) and Weight (B29) or Spring (B59) to the Pivot Shaft (A13). If
equipped with lever & spring, install Spring Bracket (B60) assembly to Body (A01) using Spring
Bracket Bolts (B62); then hook end of spring thru Eye Bolt (B61).
Adding Air Cushion Assembly to Valve
These valves may open or close, swinging the counterweight/spring loaded arm without
warning due to flow changes from pumps starting and stopping. Servicing or working
around these valves while the pipeline is under pressure can cause personal injury or
equipment damage.
Workers must be cautious when working around these valves. Relieve pipeline pressure
and lockout the pumps before servicing the valve.
1. Relieve the pressure in the pipeline and close the valve. Lockout the pumps.
2. Loosen the Screw (B55) and remove the Counter Weight Arm (B19) and Weight (B29)
assembly or Spring (B59) with Spring Bracket (B60). (Note that a special spring bracket is
required to add an air cylinder to a lever & spring valve.)
3. If Clevis Pin (B59) is installed in cylinder rod eye, uninstall retaining rings (B60) and Clevis Pin
4. Install the Cushion Lever (B27) and Key (B34) on the Pivot Shaft (A13). Secure to Pivot Shaft
by tightening Cushion Lever Screw.
5. Install the Cushion Cylinder (B20) and Bracket (B24) assembly to the Body (A01) using Hex
Bolts (B21) and Washers (B22). If equipped with lever & spring, install Spring Bracket (B60) as
shown on special assembly drawing provided.
D12003
Page 8
October 2018