NIBCO 3-Piece Steel Ball Valves - Manual (Page 2)

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PTFE pipe tape is a suitable sealant for threaded valves. To prevent stainless steel pipe threads
from galling, apply proper lubrication to the threads.
2. SOCKET AND BUTT WELD BODY ENDS:
WARNING: This valve must be partially disassembled before installing, as the seats and seals
in the valve cannot withstand the high temperatures the valve will be subjected to during
welding.
BODY SECTION
1. Turn handle (6) to the full open position.
2. Tack weld the valve body end (11) in place.
3. Loosen all four bolting; remove 2, 3, 4 bolts (12) and nuts (13).
4. Swing out the center valve section (1, 2, 3, 4, 5, 6, & 7); prevent the seats (9) from
falling out.
5. Finish welding the two body ends (11).
6. Swing back the center valve section and slide assembly between the body ends (11)
until the grooves in the body are resting on the body ends.
7. Install the 2, 3, 4 bolts and nuts, finger tighten all bolts, keeping center section
centered between the body ends (11).
8. Tighten all body bolts (12, 13) torque valves are listed in drawing; use a cross corner
pattern when tightening bolts (12, 13).
MAINTENANCE
Routine maintenance consists of tightening the adjustable pack gland (5) 1/4 turn periodically to
compensate for the wear caused by the stem’s (2) turning against the resilient PTFE packing
(4). Periodically observe the valve to be sure of proper performance, more frequent observation
is recommended under extreme operating condition.
Overall maintenance consists of replacing seats (9), packing (4) and body end seal (10). A
standard repair kit consisting of these parts may be obtained from your distributor.
DISASSEMBLY
This ball valve is designed to be serviced in or out of the pipe line; the following instructions are
for in-line disassembly.
1. Comply fully with the instructions in the warning section at the beginning of this
document.
2. After bleeding pressure, be sure to cycle the valve, leave the valve in the open
position. The center body section will not swing out if the valve is in the closed
position.
3. Remove the handle nut (7), spring washer (7A) and handle (6, 6A).
4. Using an appropriate size wrench, loosen the four bolts and nuts (12, 13). Remove
three of the four bolts from the valve. Leave the remaining bolt in place with the nut
backed off at least 1/4". Swing the valve body (1) out of the pipe line. Be careful not
to damage the sealing surface at each end of the valve.
5. Rotate stem (2) so that the valve is in the fully closed position. Remove the body end
seal (10) from the body end (11) and the seats (9) from the valve body (1). Body
seals may be tightly compressed in their groove; use extreme care when prying them