Flowserve 1878 Swing Check Valve - Manual (Page 6)

1878 Swing Check Valves FCD ADENIM0006-00
6
7.0 Maintenance Requirements
(Continued)
7.2 Recommended Spare Parts
7.2.1 Recommended spare parts are gaskets, machine screws and resilient seats. The recommended quantity is 1
gasket, 4 machine screws and 1 resilient seat for every 2 valves of a particular type but not less than 1 set of
each type.
8.0 Periodic In-service Testing Recommendations And Procedures
8.1 This is not required for swing check valves without external operators.
9.0 Maintenance Instructions
9.1 The following instructions cover the disassembly and reassembly of a swing check valve.
CAUTION
CHECK LINE PRESSURE: IF LINE IS STILL UNDER PRESSURE,
VENT BEFORE VALVE DISASSEMBLY IS STARTED.
9.1.1 Disassembly
Extreme care should be taken to ensure that the hinge pin, hinge and disc do not separate when removed as
one unit. Failure to do so may cause damage to the disc.
After removal from the valve, care should be taken to protect the seating surface of the disc from damage. The
disc should be placed in a clean area until ready to replace in the valve. THE SLIGHTEST NICK OR
SCRATCH ON A SEATING SURFACE MAY PREVENT COMPLETE SHUT-OFF AND NECESSITATE
EXTENSIVE REWORK OR REPLACEMENT.
(1) Remove the Bonnet Nuts (230) from the Bonnet Studs (200).
(2) Remove the Bonnet (002) from the Body (001). Be careful not to scratch the gasket seating surface.
(3) Remove the Gasket (100) from its groove. This operation may require the use of a screwdriver or
similar tool to pry the gasket from the groove. Be careful not to scratch the gasket seating surface.