Top Entry Trunnion Mounted Cryogenic Ball Valves – C52
Valves Series
Top Entry Trunnion Mounted Cryogenic Ball Valves – C52
Valves
Series
18
4.
Stem disassembly and assembly of manually operated valves
The following instructions cover bent type handles for small valves (sizes from 1/2” to 1") and pipe type
handles for large valves (sizes 1-1 ⁄ 2” to 6"). Refer to the exploded views on page 20 to identify each handle
type and its corresponding parts. For actuated valve stem assembly refer to page 16.
4.1.
Bent type handle disassembly (sizes from 1/2” to 1")
4.1.1.
Remove the handle nut, serrated washer, handle, locking clip, stem nut, two disc springs,
follower, anti-abrasion ring and the stem seal. Place all removed components in a clean, secure
area.
4.2.
Bent type handle assembly (sizes from 1/2” to 1")
4.2.1.
Lubricate the stem seal and the anti-abrasion ring with appropriate lubricant.
4.2.2.
Holding the stem up insert new stem seal over the stem and into the stem bore. Place the anti-
abrasion ring, slide bearing, follower and two disc springs. The slide bearing coated side shall face
down. Hand screw the stem nut onto the stem.
4.2.3.
Tighten the stem nut onto the stem according to table 2.
4.2.4.
Insert the locking clip, handle, serrated washer and the stem bolt.
4.2.5.
Place and tighten the stop screw.
4.2.6.
With correct stop-pin installation, the handle will provide quarter clockwise turn from open to closed
position.
4.3.
Pipe type handle disassembly
(sizes from 1- 1/2” to 6")
4.3.1.
Remove the wrench bolt, handle, wrench head, stem nut, tab lock washer, stop plate, follower,
slide bearing, anti-abrasion ring and the stem seal. Place all removed components in a clean,
secure area.
4.4.
Pipe type handle assembly
(sizes from 1- 1/2” to 6")
4.4.1.
Lubricate the stem seal and the anti-abrasion ring with appropriate lubricant.
4.4.2.
While pulling up on the stem, insert the new stem seal over the stem and into the stem bore.
Place the anti- abrasion ring, slide bearing, follower, stop plate and the tab lock washer. The
coated side of the slide bearing should face down. Hand tighten the stem nut onto the stem.
4.4.3.
Tighten the stem nut onto the stem according to table 2 and lock the tab washer ears onto the nut.
4.4.4.
Place the wrench head on the stem making sure it is parallel to the stem groove to ensure correct
handle position with respect to the ball position. The handle is parallel to the line, when the ball is in
the open position.
4.4.5.
Insert the handle through the wrench head and tighten it with the wrench bolt.
4.4.6.
Place and tighten the stop screw and the spring washer.
4.4.7.
With correct stop-pin installation, the handle will provide quarter clockwise turn from open to close
position.
