Flowserve 1878 Piston Check Valve - Manual (Page 7)

1878 Piston Check Valves FCD ADENIM0005-00
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 The Series 1878 piston check bonnet retainer threads have been hard-chromed to minimize friction.
A light coating of lubricant should also be applied if and when the valve is reassembled.
8.0 Periodic In-service 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 bonnet retainer (034) 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.