Leslie Controls D Series - Manual (Page 9)

CFTIIP-015
Rev.0
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reproduced in one form or another.
Page 9 of 15
Figure 4.1 Grafoil seal ring
CAUTION: Graphite seal rings are brittle
parts, so care must be taken to avoid
damage during following steps.
• Using a sharp knife, score the
graphite ring in one location.
• Hold each side of the ring around the
score mark between thumbs and
forefingers and bend the ring to
break at the scribe mark.
• By means of a very fine file, adjust
each broken end so that the external
ring circumference equal the proper
internal circumference of the cage
(18).
• Remove seal ring from the cage.
Open the seal ring sufficiently to
place it around the top of the plug.
Slide the ring along the plug and
insert into groove.
Graphite seal ring:
The seal ring cut location shall be placed at
180° apart when both the seal rings are
inserted into plug groove.
4. Lower the plug (15) into the body and
cage (18). Care should be taken with the plug
(16) seals to avoid scoring or galling the
sealing surface while fitting them into the
cage bore.
5. Lower the bonnet (2) onto the plug (15)
and body, taking great care to avoid scoring
the plug stem.
6. Once the bonnet is resting squarely in the
valve body, finger tighten the bonnet flange
bolting.
7. Reinstall the packing (8), guide bush (9)
and Lantern ring (10) referring to the
appropriate packing installation manual and
reinstalling new packing exactly as shown.
Make sure at least 1
⁄8" is left at the top of
packing box for the top guide to enter
8. Replace and tighten the packing gland
(12) and bolting (13, 14).
9. Turn actuator back onto the body
assembly, without turning the plug inside the
bonnet. Leave a 3
⁄32" to 1⁄8" (2 mm to 3
mm) gap between the mating surfaces of the
bonnet and yoke. Tighten
Yoke bolting to close this gap. Firmly tighten
the yoke bolting.
10. Using the actuator, seat the plug two or
three times to centre the seat ring (17) using
pressure on the top of the actuator.
11. Tighten the body bolting, following the
bolting sequence outlined in Figure 1. Use a
minimum of four steps to reach the
suggested bolt torque values shown in Table
1. Never exceed more than 30% of the
suggested bolt torque value in a single step.
12. Slowly stroke the plug up and down to
check the alignment of the plug with the
cage.
13. Perform a Quick Check as described in
section 4.1.