Flowserve 1878 Piston Check Valve - Manual (Page 8)

1878 Piston Check Valves FCD ADENIM0005-00
8
9.0 Maintenance Instructions
(Continued)
Pulling of the capscrew (216) will remove the bonnet (002), pressure seal gasket (030) and spacer
ring (032). Lift out the spring (429) and disc (004).
It may be necessary to insert a wire hook into the holes located in the side of the disc in order to lift
the disc out of the valve.
9.1.2 After removal of the disc from the valve, care should be taken to protect the seating surface from
damage. The disc should be placed in a clean area until it is ready for replacement. THE
SLIGHTEST NICK OR SCRATCH ON SEATING SURFACE MAY PREVENT COMPLETE
SHUTOFF AND NECESSITATE EXTENSIVE REWORK OR REPLACEMENT.
9.1.3 Resilient Seat Removal (if so equipped)
To disassemble disc/resilient seat assembly:
a) Remove retaining ring (245)
b) Unscrew disc (004) from disc skirt (005)
Note: For removal, disc skirt should be held by the relieved outside diameter containing the
drainage hole rather than by the outside diameter guiding surfaces. A slot for a fitted
screw driver is provided at the top of the disc to facilitate removal and to prevent damage
to these critical surfaces.
c) Remove the resilient seat by carefully slipping it over the disc.
CAUTION
DO NOT EXPOSE THE RESILIENT SEAT TO ANY
PETROLEUM BASED OILS OR GREASES OR OTHER
CUTTING FLUIDS, LUBRICANTS, ETC. WHICH
ARE HYDROCARBON BASED.