Flowserve 1878 Swing Check Valves with Pressure Seal - Manual (Page 8)

1878 Swing Check Valves with Pressure Seals FCD ADENIM0007-00
8
9.0 Maintenance Instructions
(Continued)
9.3 Trouble Shooting
A. Leakage Between the Disc (004) and Seat Ring (013)
This could be an indication that there is foreign matter on the seating surfaces.
Disassemble the valve and remove the source of the trouble. If no foreign matter is found, inspect the seating
surfaces of the valve for signs of a scarred or damaged seat - in which case the seating surfaces of the Disc
(004) and Seat Ring (013) should be lapped until no visible defects remain. (Refer to Para. 9.2)
B. Leakage Between the Body (001) and Bonnet (002)
This would be a good indication that the pressure seal gasket (030) is worn out or damaged. Replacement of
gaskets is set forth in Paragraph 9.1. Another source of the trouble might be that the bonnet capscrew is loose
– if this should be the case – tighten it securely.