Flowserve 1878 Swing Check Valves with Pressure Seal - Manual (Page 6)

1878 Swing Check Valves with Pressure Seals FCD ADENIM0007-00
6
9.0 Maintenance Instructions
(Continued)
9.1.1 Disassembly (Continued)
WARNING
PRIOR TO PERFORMING DISASSEMBLY,
CLOSE OFF THE LINE PRESSURE TO THE VALVE,
AND RELEASE ALL PRESSURE IN THE VALVE.
1) Remove the anti-rotation pin (258) and bonnet capscrew (216). The bonnet retainer (034) may
now be unscrewed and removed. Now thread the bonnet capscrew (216) directly into bonnet
(002) and pull bonnet capscrew (216) directly upward.
2) Care should be taken to pull evenly and straight upward as not to score the neck walls of the valve
and bonnet edges.
3) Pulling of the capscrew (216) will remove the bonnet (002), pressure seal gasket (030) and spacer
ring (032).
4) Remove the two (2) locating pins (257). Take care to ensure the hinge pin / hinge / disc assembly
(041, 006, 004) DO NOT drop into the body when the second locating pin (257) is removed.
5) Remove the hinge pin / hinge / disc assembly (041, 006, 004) from the body (001).
6) Remove the hinge pin (041) from the hinge (006).
7) Remove the disc nut pin (265) from the disc nut (239).
8) Remove the disc nuts (239) and the disc washer (248) from the disc (004) and remove the disc
(004) from the hinge (006).
(9) Remove the Resilient Seat (306) from the Disc (004) by first grinding loose the lock weld between the
Retaining Ring (015) and the Machine Screws (224). Unscrew the Machine Screws (224) from the
disc/retaining ring assembly and then the Retaining Ring (015) can be lifted off the Disc (004) and the
Resilient Seat (306) removed.