4-14. ELBOW VALVE REPAIR.
This task covers:
INITIAL SETUP :
General Mechanics Tool Kit (Item 1, App B)
Detergent, General Purpose (Item 1, App E)
Pipe Wrench (Item 2, App B)
Wiping Rag (Item 2, App E)
Vice (Item 2, App B)
Coupling Gasket (2) (Item 1, App I)
Equipment Condition :
Packing (Item 9, App I)
Elbow valve removed (para 3-4a)
Ensure that all parts identified as mandatory replacement parts are discarded and replaced with
Disassembly. Refer to figure 4-1.
Remove nut (1), washer (2) and handwheel (3) from stem (9)
Unscrew packing nut (4) from from valve body (10)
Use care when removing packing to prevent scratching stem. Scratching stem will cause
premature failure of elbow valve.
Remove packing gland (5) and packing (6) from stem (9)
Remove coupling gaskets (7 and 8) from valve body (10).
Wash all components with clean water and detergent
Rinse components in clean water and dry with wiping rag
Inspect valve body (10) for cracks and corrosion.
Inspect sealing surface of stem (9) for scoring, scratches and nicks
Repair. Replace damaged parts and all sealing components. If stem (9) or valve body (10) is
damaged or defective, replace entire elbow valve