DeZurik BHP, Руководство пользователя, Страница: 13 / 30

DeZURIK
BHP High Performance Butterfly Valves
November 2015 Page 13 D10503
Replacing Packing
( Continued)
e. Replace the gland (A12) and the two gland nuts (A15). Tighten the nuts finger tight, plus ½ turn.
f. Continue with step 10 on page 16.
Graphoil Live-Loaded Packing Option (G2L)
The new packing (A11) consists of three or more Graphoil rings between two anti-extrusion washers
(A34). A quantity of new spring washers (A36) is required as shown in Table A (page 17) for Class
150 valves and in Table B (page 18) for Class 300 valves.
Figure 8 — Packing Option (G2L)
a. Lubricate the following surfaces with Krytox 240 AC lubricant:
•
The inside and outside of each new packing ring
•
The threads of the two studs (A14)
•
The threads and contact faces of the two gland nuts (A15)
b. Place the new packing (A11) and anti-extrusion washers (A34) in the body, one ring at a time, in
the configuration shown in Figure 8.
c. Place the packing washer (A10) into the packing chamber.
d. Install the retaining ring (A46) into the groove in the shaft (A4).
e. Replace the gland (A12), the new spring washers (A36), the two flat washers (A37) and the two
gland nuts (A15).
f. Arrange the spring washers in the configuration shown, with the top and bottom washers in
series and the remaining washers in parallel.
g. Tighten the nuts finger tight and torque the nuts evenly to the value in Table A (page 17) for
Class 150 valves and in Table B (page 18) for Class 300 valves.
h. Continue with step 10 on page 16.