22
TC-003001-30 / Rev 01
Feb-02
6.
Install the ball thrust washer (if applicable) and the trunnion radial bearing in the ball trunnion bore.
7.
Grease the ball drive pin holes and install the drive pins. Make sure the drive pins are placed correctly in
the holes and do not stick above the ball.
8.
Apply a coat of lubricant on the entire surface of body and tailpiece seat pockets and install the seat
springs into the seat pockets.
9.
Lower one seat assembly, with the insert facing up, into the body pocket. Press the seat using a proper
tool until the O-rings and back-up rings are completely engaged in the pocket. Take care to avoid
damaging the seat insert.
10.
Repeat the procedure with the other seat into the tailpiece seat pocket.
11.
Lift the ball and slightly lower into the body until it rests on the body seat, then orient the ball trunnion
hole with the body trunnion hole. The ball should be in the closed position and symmetrically oriented
over the body seat. There should be an equal amount of the body seat visible on both sides of the ball.
12.
Grease the body trunnion hole and stem hole.
13.
Set the ground spring on top of the trunnion with a generous amount of grease, and push the trunnion
into the body bore hole until the trunnion engages the ball. Use a rubber mallet if necessary. Install the
lower cover plate over the trunnion and thread at least two cap screws until the cover plate back face
contacts the body trunnion boss face.
14.
Flip the tailpiece over using the proper lifting equipment. Lift the tailpiece and start lowering it onto the
body. Before the tailpiece engages the studs, orient it such that the grease fittings of the tailpiece are on
the same side as the grease fittings of the body, towards the front of the valve or aligned with the stem
bore (if applicable). At the same time, the tailpiece end flange bolt holes must be aligned with the body
end flange bolt holes. After these two alignments are completed, slowly lower the tailpiece onto the body
until it rests on the ball.
15.
Install two nuts, 180°apart, and tighten sequentially until the tailpiece is contacting the body around the
entire flange. Install the remainder of the nuts.
16.
The stem should be installed at this time.
NOTE:
The ball was installed in the closed position and the drive pins should be aligned with the valve bore.
Check to make sure the drive pins are in the correct place on the ball holes. Orient the stem (as shown in
Fig. 13) with the key groove toward the valve body markings and the drive pin holes matching the drive pins
in the ball. Orient the bearing splits towards the stem key groove and drive the stem into the body using a
rubber mallet until the stem completely engages the ball and drive pins.
