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

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out. Damage such as scratches to the bottom of the groove will cause leaks. If the
seats (9) are not easily removed, gently tap the ball (8) with a piece of wood or other
soft material.
6. Remove the ball (8) from the valve body (1).
7. Press the stem (2) from the top into the valve body (1) and remove it through on end
of the body.
8. Carefully pry out and discard the old stem packing (4) and the stem thrust washer
(3); a sharp instrument may be needed. Be careful not to damage any of the stem
sealing or bearing surfaces.
ASSEMBLY
The following instructions are for in-line assembly. For bench assembly, which may be more
convenient, follow a similar procedure by holding the valve in a vise by one body end. Use care
not to cut or scratch the seats (9) or body end seals (10).
1. With the valve body (1) swung to the out-of-line position, insert the thrust washer (3)
into the stem bore.
2. Insert the threaded end of stem (2) into the stem bore and up out the top of the
valve. Be careful not to damage the stem thrust washer (3).
3. Holding the stem with thrust washer in place from inside the valve, install two
packing (4), and the pack gland (5) on the stem (2).
4. Place a wrench through the body on the bottom of the stem blade (2) to hold the
stem (2) stationary. Place another wrench on the stem (2) and turn the pack gland
(5) down until packing (4) bottom and the stem (2) comes snugly in place. Tighten
the pack gland (5) until snug, plus an additional 1/4 – 1/2 turn.
5. Align the stem blade (2) inside the valve body (1) with the ball (8). Insert the ball (8)
and rotate the stem (2) to the fully closed position.
6. Working at either end of the valve body (1), place a seat (9) into the valve body (1).
Push the seat (9) snugly against the closed ball (8).
7. Place a body end seal (10) into the machined sealing groove of the body end (11).
Be certain the groove and seal (10) are clean.
8. Repeat steps 6 and 7 for assembly of the opposite end of the valve.
9. Turn the stem (2) to the fully open position.
10. Swing the entire body assembly back into the properly aligned, and interlocked
position between the body ends (11), being careful not to scratch the body seals
(10). The body end (11) may have to be spread slightly to accept the body (1).
11. Close the valve.
12. Bolt the valve together with body bolts (12), spring washers (12A), and Nuts (13).
Tighten the nut (13) in sequence 4, 2, 3 as shown on page 2.
13. Place the handle (6), spring washer (7A), and stem nut (7) over the stem (2). Tighten
the stem nut (7) until snug.