API 6D Two - Piece
Cast Trunnion
Mounted Ball Valve
Atlas Series
Document Number:
Revision:
Release Date:
EDC 506
0
01/03/2018
IOM: Installation, Operation and Maintenance Manual
13/17
6.2 RECONDITIONING
The metallic parts can be cleaned using cloths wet with the cleaner.
To clean the O-Rings and gaskets use dry, clean cloths. If possible, it is recommended to wash the
O-Rings with soap and water, rinsing with clean water.
After cleaning components be sure that there are no damaged parts and, particularly, there are no
scores on metallic surfaces in moving or sealing areas. Also, check the condition of the O-Rings
and back-up rings, making sure that they have not been damaged.
Replace any damaged parts.
Lubricate O-Rings and metallic surfaces, which come into contact during the ball movement with
VALTEX 2000 grease. The stem /trunnion bearing (19)/ (35) are self-lubricated and do not require
any additional lubrication.
6.3 REASSEMBLY
(a) To reassemble the seat group in the body (1) and closure (2) proceed as follows:
Put the body gasket (13) and O-Ring (12) into their housing in the closure (2). The body O-Ring
(12), seat O-Rings (9), stem O-Rings (21) and trunnion O-Ring (32) must be fitted stretching them
slightly. Any damage on these O-Rings can cause breakages during the valve assembly.
During reassembling, refer to markings applied before disassembling.
Insert the seat springs (11) into the seats (6) or body (1) and closure (2), where provided.
Insert the seat O-Rings (9) and seat the fire safe seals (8), where provided
Press the seat assembly (6) into the body (1) and closure (2)
When pressing the seat into the body and closure, pay attention that the seat moves correctly,
parallel to the body and closure surfaces. For this operation, we recommend using clamps and a
rubber hammer.
It is not possible to replace the seat insert (7) only.
(b) Assemble the stem/lantern ring group as follows:
Insert in the upper part of the stem (4) into the stem thrust washer (18) and stem bearing (19).
Assemble to the stem O-Rings (21) on lantern ring (20).
Insert the stem (4) into the lantern ring assembly.
Insert the upper gland pins (30) in the body (1).
Insert the stem fire safe seal (28).
(c) Turn the valve bringing the stem axis in the vertical position.
(d) Fit the stem/lantern ring group following the markings made before disassembling. If parts are
correctly aligned, reassembly shall be easy.
(e) Reinstall the ball (3) into the body (1).
(f) Reassemble the segment ring (23) and segment ring retainer (24), if provided.
(g) Completely tighten the body studs & nuts (14 &15), of the valve, gland flange cap screws (31) and
trunnion cap screws. Refer to section 8.
(h) Be careful not to over-torque the nuts and cap screws. Damages to the threads can cause the
flanged joint to fail under pressure and injury personnel performing test operation.
(i) Insert the stem drive keys (25) on the stem (4)
(j) Reassemble the segment-retaining pin (27), if provided.
(k) Reassemble seat injection fitting (37), when provided; stem injection fitting (38), and the cavity
bleed fitting (40).
(l) Reassemble the gearbox operator (43), if provided ensuring that all the marks previously made
correspond and using only part of the fixing studs (41) and nuts (42). Carry out some opening and
closing operations, verifying the perfect functioning of the operator and the valve.
