Flowserve 1878 Swing Check Valve - Manual (Page 7)

1878 Swing Check Valves FCD ADENIM0006-00
7
9.0 Maintenance Instructions
(Continued)
9.1.1 Disassembly (Continued)
(4) Remove the 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) (if so equipped) 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.
9.1.2 Reassembly
REASSEMBLY OF THE VALVES is simply the reverse of 9.1.1, read the following special instructions.
First, all dirt, scale and foreign matter should be removed from inside the valve body and bonnet.
Before reassembling the valve, check the seating surfaces to determine that no scratches or minor
imperfections are on the disc or seat ring. If any are evident - lap these surfaces until none are visible.
(Reference Para. 9.2)
Remember to lock weld the Machine Screws (224) to the Retaining Ring (015) after installing a new resilient
seat (if equipped).
When replacing the Bonnet Studs and Nuts (200 & 230) consult the applicable drawing or Section 11 for
correct torque to assure tightness of seal.