DeZURIK
BHP High Performance Butterfly Valves
D10503 Page 10 November 2015
Replacing Packing (Continued)
PTFE Dual-Seal with Mechanical Spring Packing Option (TMD)
The new primary packing (A11) consists of one spring-loaded bottom end ring, three or more chevron
rings and one top end ring, all between two anti-extrusion washers (A34); the new secondary packing
(A26) consists of one bottom end ring, three or more chevron rings and one top end ring, all between
two anti-extrusion washers (A34).
Figure 4 – Packing Option (TMD)
a. Place the primary (lower) set of new packing (A11) and anti-extrusion washers (A34) in the
body, one ring at a time, as shown in Figure 4—do not lubricate.
b. Place the new gasket (A16), the secondary packing chamber (A17) and the new secondary
packing (A26), one ring at a time, in the configuration shown in Figure 4—do not lubricate.
Start each chevron ring into the packing chamber at a slight angle and push each ring
carefully into position so that the sealing lips do not bend over.
c. Place the packing washer (A10) into the secondary packing chamber.
d. Install the retaining ring (A46) into the groove in the shaft.
e. Place the gland (A12) and the two gland nuts (A15) in position as shown—do not tighten the
nuts.
f. Mount the actuator bracket and the secondary packing chamber to the body with the same
screws and tighten the screws as shown in Table C on page 19.
g. Tighten the gland nuts (A15) finger tight, plus ½ turn.
h. Continue with step 10 on page 16.
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