DeZurik APCO CVS-250A Manual de instrucciones - Página 6
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DeZURIK
APCO CVS-250/250A Swing Check Valves
Maintenance
(Continued)
Shaft Packing Replacement
Removal of the valve from the line for shaft packing replacement is not required as long as the shaft is
accessible.
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.
2. If needed, remove Counter Weight Arm Assembly (B19), Cushion Lever (B27). Then, remove
the Packing Gland Nuts (A54), Washers (A50), and Packing Gland (A37) from Pivot Shaft
(A13).
3. Remove the packing (A17) with a flexible packing hook or similar tool. Clean the packing area,
being careful not to damage it.
4. Obtain the proper size packing from the parts list. Cut the packing rings to fit around the shaft.
Install one ring 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. Do not depend
on the packing gland entirely to seat the set of rings properly. This practice will jam the last rings
installed but leave the first ones loose in the box.
5. See "Shaft Packing Adjustment" section to adjust packing after replacing.
Disc Seat Replacement
These valves may open or close, swinging the counterweight/spring loaded arm without
warning due to flow changes from pumps starting and stopping. Servicing the valve 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. Remove Seat Retaining Ring (A31) from Disc (A10).
3. Remove old Disc Seat (A06) and replace with new Disc Seat.
4. Re-install Seat Retaining Ring (A31).
D12003
Page 6
October 2018