
DeZURIK
November 2020
Page 25
D10322
Seat Replacement
(Continued)
Intelli-Seal Seat Options (IS1 and IS2)
a. If the actuator is
connected to the
valve shaft, loosen
the connection so that
the valve shaft can
rotate.
b. Loosen the packing
gland nuts (A15).
c. Apply a light coat of
Krytox 240 AC
Lubricant to the
sealing surface of
seat and disc.
d. Center the gasket
(A27) and the metal
seat (A28) on the
closed disc.
e. Apply a rust inhibitor such as Never Seez to the threads of the seat retainer screws (A23).
f. With the body horizontal, the disc closed, and the seat side up, center all seat components
on the closed disc, and tighten the seat retainer (A23) screws finger tight.
g. Operate the valve fully opened and closed 6 times.
h. Tighten the seat retainer Screws (A23) as
shown in Table D.
i. If the valve actuator connection was loosened
in step a, tighten the connection.
j. Adjust the packing gland nuts (A15) as
described in the packing adjustment section.
k. If the packing is live-loaded, tighten the nuts as
shown in Table A (page 17) for Class 150, PN
10, PN 16 and JIS 10 valves and in Table B
(page 18) for Class 300, PN 25, PN 40 and JIS
20 valves.
l. Continue with step 7.
7. Install the valve in the pipeline as described in the
Installation section.
8. If the actuator is a powered actuator, reconnect the power to the actuator.
9. Pressurize the valve.
10. If packing leaks, tighten the gland nuts evenly and slowly
– just enough to stop the leakage.
Figure 14
— Seat Options (IS1 and IS2)
Tabel D: Seat Retainer Screw
Torques
Screw
Size
Torque
ft lbs
Nm
8-32
1.5 ± 0.5
2.03 ± 0.69
10-24
2.5 ± 0.5
3.39 ± 0.69
1/4-20
5.5 ± 1.5
7.46 ± 2.03
5/16-18
12.0 ± 3.0
16.27 ± 4.07
3/8-16
21.5 ± 5.5
29.15 ± 7.46
1/2-13
45.0 ± 7.0
61.01 ± 9.49