NIBCO Unibody 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
cautionary statements prior to disassembly. Refer to Figure 1 for material list and
parts reference.
2. Place body on workbench or in a vice with the end plug facing up. Remove end
plug by rotating counter clockwise, using appropriate spanner wrench or tool to
engage end plug.
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).
4. With all seats and seals removed (5), (9) and (10), using the appropriate wrench,
screw the end plug into the body until the end plug shoulder hits the body. Mark the
end plug and body at this position. Unscrew and remove the end plug and proceed
to the next step.
IV. ASSEMBLY
1. Clean all parts. Care should be taken not to scratch sealing surfaces in the body
and on the end plug. Lightly lubricate the seats, ball, stem and O-ring with a
lubricant compatible with the fluid that will be handled by the respective valve.
2. Slide one seat ring (5) into seat pocket in body (1) with flat side of seat ring
positioned against the bottom of the pocket and the angled side toward the ball.
3. Slip thrust washer (14) over stem (4) to fit against the head of the stem.
4. Push the stem (4) and thrust washer (14) through the stem hole from the inside of
the body (1) so that the stem protrudes out of the body. Position the stem so that
the flats on the stem head point toward the seat ring.
5. Carefully place the ball (3) into the body (1) so the stem head fits into the milled
slot on the ball. The ball should remain in the closed position during the assembly
process.
6. Place O-ring (9) into the groove on the end plug (2).
7. Place seat ring (5) into the pocket of end plug (2) being careful to have angled side
of seat ring facing the ball (3).
8. Place spiral wound gasket (10) into pocket on end of valve body (1).
9. Push end plug (2) into body (1) so that end plug threads engage allowing end plug
to be tightened.
10. Tighten end plug (2) until a firm stop is reached (should line up with marks made
during step 3).
11. Open and close valve slowly a few times to work in seats against ball.
12. Place valve on its side so stem is pointing upright. Place packing set (6) over stem
(4) being careful that the individual rings have the "V" turned upside down.
13. Slip gland bushing (7) over stem (4) to fit on top of packing.
14. Thread pack nut (8) on stem (4) and tighten firmly to assure packing is forced to
bottom of stuffing box and seated against stem.
CAUTION: HANDLE ALL PARTS CAREFULLY PAYING PARTICULAR ATTENTION TO
SEATS, SEALS AND BALL TO PREVENT SCRATCHES OR OTHER DAMAGE THAT
MIGHT AFFECT THE PERFORMANCE OF THE VALVE.