Fisher EAT easy-e, Инструкция по эксплуатации, Страница: 8 / 44

ET Valve
Instruction Manual
Form 5081
June 2002
8
Table 4. Recommended Torque for Packing Flange Nuts
VALVE STEM
GRAPHITE TYPE PACKING PTFE TYPE PACKING
VALVE STEM
DIAMETER
CLASS
Minimum Torque Maximum Torque Minimum Torque Maximum Torque
mm Inches
CLASS
N m Lbf in N m Lbf in N m Lbf in N m Lbf in
125, 150 3 27 5 40 1 13 2 19
9.5 3/8
250, 300 4 36 6 53 2 17 3 26
9.5 3/8
600 6 49 8 73 3 23 4 35
125, 150 5 44 8 66 2 21 4 31
12.7 1/2
250, 300 7 59 10 88 3 28 5 42
12.7 1/2
600 9 81 14 122 4 39 7 58
125, 150 11 99 17 149 5 47 8 70
19.1 3/4
250, 300 15 133 23 199 7 64 11 95
19.1 3/4
600 21 182 31 274 10 87 15 131
300 26 226 38 339 12 108 18 162
25.4 1
600 35 310 53 466 17 149 25 223
300 36 318 54 477 17 152 26 228
31.8 1-1/4
600 49 437 74 655 24 209 36 314
cap screw or nut. Repeat the crisscross
tightening pattern several times until
each cap screw or nut is tight and the
body-to-bonnet seal is made. When the
operating temperature has been
reached, perform this torquing
procedure once again.
10. Lubricate the bolting (not necessary if factory
pre-lubricated stud bolt nuts are used) and install it,
using accepted bolting procedures during tightening,
so that the body-to-bonnet joint will withstand test
pressures and application service conditions. Use
the bolt torques in table 3 as guidelines.
11. Install new packing and the metal packing box
parts according to the appropriate arrangement in
figure 3, 4, or 5. Place a smooth-edged pipe over the
valve stem and gently tap each soft packing part into
the packing box.
12. Slide the packing follower, upper wiper, and
packing flange (keys 13, 12, and 3, figure 14) into
position. Lubricate the packing flange studs (key 4,
figure 14) and the faces of the packing flange nuts
(key 5, figure 14). Install the packing flange nuts.
13. For spring-loaded PTFE V-ring packing,
tighten the packing flange nuts until the shoulder on
the packing follower (key 13, figure 14) contacts the
bonnet.
For graphite packing, tighten the packing flange
nuts to the maximum recommended torque shown in
table 4. Then, loosen the packing flange nuts, and
retighten them to the recommended minimum torque
shown in table 4.
Figure 5. Detail of Graphite Ribbon/Filament Packing for
Plain and Extension Bonnets
PACKING
FOLLOWER
(KEY 13)
LANTERN
RING (KEY 8)
PACKING BOX
RING (KEY 11)
1
12.7 mm
(1/2ĆINCH)
STEM
SINGLE ARRANGEMENTS
NOTE:
0.102 mm (0.004 INCH) THICK SACRIFICIAL ZINC WASHERS;
USE ONLY ONE BELOW EACH GRAPHITE RIBBON RING.
A5864 / IL
1
GRAPHITE
RIBBON
PACKING RING
(KEY 7)
GRAPHITE
FILAMENT
PACKING RING
(KEY 7)
1
1
9.5 mm
(3/8ĆINCH)
STEM
19.1, 25.4, & 31.8 mm
(3/4, 1 & 1Ć1/4 INCH)
STEM
14A3411-A 13A9775-B 13A9776-B
PACKING
FOLLOWER
(KEY 13)
LANTERN
RING (KEY 8)
PACKING BOX
RING (KEY 11)
1
12.7 mm
(1/2ĆINCH)
STEM
DOUBLE ARRANGEMENTS
GRAPHITE
RIBBON
PACKING RING
(KEY 7) GRAPHITE
RIBBON
PACKING RING
(KEY 7)
GRAPHITE
FILAMENT
PACKING RING
(KEY 7)
1
1
9.5 mm
(3/8ĆINCH)
STEM
19.1, 25.4, & 31.8 mm
(3/4, 1 & 1Ć1/4 INCH)
STEM
14A2153-B
14A1849-B
14A1780-B
1
For other packing types, tighten the packing flange
nuts alternately in small equal increments until one
of the nuts reaches the minimum recommended