DeZurik APCO CVS-6000 Installation, Operation And Maintenance Manual - Page 6
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DeZURIK
APCO CVS-6000 Swing Check Valves
Disassembly
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.
2. If it is necessary to remove valve from pipeline, set valve standing on its inlet flange.
3. Support counterweight (29), then unscrew counterweight set screw (36) and remove
counterweight assembly (44).
4. Loosen nut (56) holding counterweight arm assembly to pivot shaft (13) and remove
counterweight arm assembly.
5. Series 6000 and 6100 valves only: Disconnect the pin between cushion lever (27) and cylinder
(20).
6. Unscrew eye bracket mounting bolts (25) to remove cylinder (20).
7. Loosen cushion lever set screw (35) to remove cushion lever (27).
8. Remove cover (2) by unscrewing cover bolts (4).
9. Unscrew disc arm set screws (14).
10. Remove pivot shaft cover (15) and seal retainer (37) at both ends of the shaft.
11. Pull pivot shaft from the right side of the valve (facing inlet).
12. Remove bushing (12), key (33), and seals (17) & (18).
13. Remove disc pin retaining rings (41) and pull out disc pins (8).
14. Pull out disc arm (9).
15. Remove disc seat (6) and seat retaining ring (31) by unscrewing all screws (32).
16. Unscrew the seat retaining screws (40) located inside the body seat ring (5).
17. Evenly pry the body seat ring (5) out of the body (1).
Assembly
1. If valve is removed from pipeline, set body standing on its inlet flange.
2. Install body seat seal (43) groove of body seat ring (5).
3. Install body seat ring (5) evenly inside the counterbore of the body (1) until it bottoms out.
4. Screw and tighten the body seat ring set screws (40) into the body seat ring (5).
D12006
Page 6
December 2012