DeZURIK
APCO SRG-6500 Surge Relief Globe Valves
December 2012
Page 5
D12020
Fusion/Powder Coated Valves
Valves with fusion/powder coated exterior paint require flat washers to be
installed under the flange nuts when installing the valve to the pipeline
flange to prevent the paint from cracking or chipping.
Maintenance
Once the valve has been correctly adjusted and placed into operation, it should require no attention
except periodic inspection of oil level in the oil reservoir.
Disassembly
See Figure 4 for part identification
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. 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).