Flowserve 1878 Swing Check Valves with Pressure Seal - Manual (Page 5)

1878 Swing Check Valves with Pressure Seals FCD ADENIM0007-00
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7.0 Maintenance Requirements
7.1 Preventative Maintenance
7.1.1 Check all bolting periodically to ensure tightness and to forestall possible leaks. Refer to section 11.0 for
bolting torque valves.
7.2 Recommended Spare Parts
7.2.1 Recommended spare parts are pressure seal 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. Typical valve configurations
are shown in Figure 1 (see Section 12).
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.