NIBCO Split-Body Flanged Ball Valves - Manual (Page 2)

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III. DISASSEMBLY
1. If complete disassembly is necessary, all seats and seals should be replaced. Read
caution statement prior to starting disassembly.
2. Using a cross pattern, loosen and remove body/end-piece stud nuts (15). Mark
body/end-piece joint for reference for reassembly. Remove end-piece.
3. Turn ball (3) to closed position. Lift ball from body cavity. If ball will not lift from
body in closed position, use a piece of wood or other soft material to gently tap the
ball (from opposite end of body). This should loosen the ball from the stem.
4. Remove the lock plate retaining ring (19) and locking plate (8).
5. Loosen and remove gland flange cap screw (13). Remove gland flange (10).
6. Press stem (4) from top into body cavity. Remove through inside of body end.
7. Stem packing and valve seats may now be removed from body and end-piece.
Care should be taken not to scratch sealing surfaces in the body and end-piece.
8. Thoroughly inspect and clean all parts prior to assembly.
IV. ASSEMBLY
Reassembly is generally a reverse procedure to Section III Disassembly.
1. Install new packing set (6) in packing well of body.
2. Stand body (1) on end. Lightly lubricate seat (5) (use lubricant compatible with
service) and position seat in seat pocket.
3. Install new thrust washer (9) on stem (4) and carefully insert stem through body
end into stem pocket.
4. Install packing gland (7), gland flange (10) and gland flange cap screws (13).
5. Tighten gland flange cap screws evenly to maintain square alignment with the
stem.
6. Position stem in line with bore to accept ball. Insert ball (3) rotating it onto the stem
in the closed position. Rock the ball to make sure the stem is centered in the ball
slot.
7. Gently press new spiral wound gasket (12) or PTFE flat ring into the machined
recess on the body.
8. Lightly lubricate the second seat ring (5) and insert into the end-piece seat pocket.
Make sure the sealing surface is toward the ball.
9. Place end-piece (2) on body. Lubricate stud threads and bottom side of nuts. Install
body nuts (15). Tighten sequentially as shown in Figure 1 to prescribed torque as
shown in Figure 2.
10. Cycle the valve slowly to insure proper position of ball to stem and seats.