Flowserve 800 Piston Lift Check Valve - Manual (Page 7)

7.0 MAINTENANCE REQUIREMENTS (Continued)
- 1½" and 2" Reduced Port Piston Check Valves
Recommended spare parts are interchangeable throughout this size range.
Note that similar materials should be ordered for valve body type (i.e.
carbon steel bonnet for carbon steel valve).
- 2" Full Port Piston Check Valves
Recommended spare parts are only interchangeable with other 2" Full Port
Piston Check Valves. Same material restrictions stated above apply.
7.3 Lubrication
7.2.1 A light coating of lubricant should also be applied to the bonnet retainer
threads if and when the valve is reassembled.
8.0
PERIODIC INSERVICE TESTING RECOMMENDATIONS AND
PROCEDURES
8.1 This is not required for piston check valves without external operators.
9.0
MAINTENANCE INSTRUCTIONS
9.1 Disassembly
WARNING
PRIOR TO PERFORMING DISASSEMBLY,
CLOSE OFF THE LINE PRESSURE TO
THE VALVE, AND RELEASE ALL
PRESSURE IN THE VALVE.
9.1.1 Remove the anti-rotation pin (258) and the bonnet capscrew (216). The
gasket retainer (033) may now be unscrewed and removed. Now thread
the bonnet capscrew (216) directly into bonnet (002) and pull bonnet
capscrew (216) directly upward.
Care should be taken to pull evenly and straight upward as not to score the
neck walls of the valve and bonnet edges.