Table Ii - Flange Bolting Torque Per Bolt Material - Flowserve Valtek Mark Two User Instructions

6.3.2 In the gap between the top of the sleeve and the bottom of
the bonnet, place wooden blocking of equal thickness in
at least three places. The wooden blocks must not extend
in far enough that they interfere with plug movement. The
plug must be allowed to stroke up to the bonnet.
6.3.3 By applying air below the piston, retract the plug until the
plug head is freed from the sleeve. Once the plug is free
from the sleeve, remove the plug and bonnet assembly from
the body.
6.3.4 Lift the pressure balanced sleeve out of the valve body
using lifting points on the top of the sleeve.
NOTE: In many small Mark One valves, the seat retainer
and pressure balancer sleeve are one and the same part. In
larger valves, there are separate pressure balancer sleeves
and seat retainers.
6.4 Lift retainer, seat ring and gaskets free of the body. Care
must be taken not to damage the gasket surfaces in the
body when the gaskets are removed.
6.5 Valves with soft seats (see figure 4) require the seat ring to
be inspected and possibly disassembled. Check to see that
seating surfaces on the plug and seat assemblies are free of
damage. If the seat insert is worn, remove it from the
assembly. Since the plug seating surface does not come
in contact with the seat insert retainer, it is not necessary
to correct any minor damage to that part. The plug seating
surface can be re-machined to a 30 degree angle. Lapping
is not required when proper reassembly procedures are
followed.
6.6 Loosen the stem clamp and unscrew the plug from the
actuator stem.
a
WARNING: Danger exists when working with large valves
and heavy parts. Take care to properly support large
Table II: Pressurized Flange Bolting Required Torque Values
Bolt Size
A193-B7; A193-B16 A320-L7
(in.)
Ft-lb
/ 80 ± 8
5
8
/ 140 ± 14
3
4
/ 230 ± 23
7
8
1 350 ± 35
1 / 520 ± 52
1
8
1 / 740 ± 74
1
4
1 / 1010 ± 101
3
8
1 / 1330 ± 133
1
2
1 / 1550 ± 155
5
8
1 / 1960 ± 196
3
4
1 / 2450 ± 245
7
8
2 3000 ± 300
2 / 4360 ± 436
1
4
2 /
5580 ± 558
1
2
2 / 7520 ± 752 10200 ± 1020
3
4
3 9860 ± 986 13370 ± 1337
3 / 12650 ± 1265 17150 ± 1715
1
4
* Contact Factory for deep cryo or bellows seal valves. NA = Studs not available in these sizes
Valtek Mark One and Mark Two Control Valves FCD VLENIM0001-02-A4 - 05/16
Flange Bolting Torque per Bolt Material
A193-B7M
A320-L7M
N-m Ft-lb
110 ± 11 60 ± 6
190 ± 19 120 ± 12
310 ± 31 190 ± 19
470 ± 47 280 ± 28
710 ± 71 420 ± 42
1000 ± 100 590 ± 59
1370 ± 137 810 ± 81
1800 ± 180 1060 ± 106
2100 ± 210 1240 ± 124
2660 ± 266 1570 ± 157
3320 ± 332 1960 ± 196
4070 ± 407 2400 ± 240
5910 ± 591 3490 ± 349
7570 ± 757 4850 ± 485
NA
NA
NA
parts to avoid damage to the parts of nearby equipment or
personnel.
6.7 Remove the packing gland bolting, yoke clamps and
remove the actuator.
6.8 If the seat surfaces need re-machining, both surfaces on
plug and seat ring must be reworked. The seat angle on
the plug is 30 degrees (36 degrees for CavControl and
ChannelStream valves); the seat ring, 33 degrees. Lapping
is not necessary if proper assembly procedures are
followed.
a
CAUTION: If re-machining, protect the stem while turning.
Ensure concentration of the seat surface with the plug
stem (or outside diameter of the seat ring, if machining the
seat)
6.9 To replace packing or change the packing box configura-
tion, push out packing, spacer and guides from underneath
the bonnet with a dowel around 0.13 inch (3.3 mm) larger
in diameter than the plug stem.
a
WARNING: For valves equipped with separable end flanges,
do not machine body gasket surfaces. Machining could
cause failure of the separable flange lip causing end gasket
leakage and valve failure.
a
CAUTION: When using separable end flanges and spiral
wound gaskets, use gaskets with outer backup rings.
Failure to do so could result in excess stress in some
applications.
6.10 Check to see the seating surfaces on both the seat ring and
plug are free of damage to ensure tight shutoff. Make sure
the gasket surfaces on the seat ring, bonnet and body are
clean and undamaged. Examine the plug stem and bonnet
bore for scoring, scratches, pitting or other damage.
6.11 Refer to the appropriate actuator User Manual for detailed
instructions on actuators.
A193-B8 Cl 1
A193-B8M Cl 1
N-m Ft-lb
80 ± 8 60 ± 6
160 ± 16 110 ± 11
260 ± 26 180 ± 18
380 ± 38 260 ± 26
570 ± 57 390 ± 39
800 ± 80 550 ± 55
1100 ± 110 760 ± 76
1440 ± 144 1000 ± 100
1680 ± 168 1170 ± 117
2130 ± 213 1480 ± 148
2660 ± 266 1840 ± 184
3250 ± 325 2260 ± 226
4450 ± 445 3280 ± 328
6580 ± 658 4560 ± 456
NA 6150 ± 615
NA 8060 ± 806
NA 10340 ± 1034
A193-B8 Cl 2 *
N-m Ft-lb
80 ± 8 80 ± 8
150 ± 15 140 ± 14
240 ± 24 190 ± 19
350 ± 35 280 ± 28
530 ± 53 390 ± 39
750 ± 75 550 ± 55
1030 ± 103 760 ± 76
1360 ± 8136 1000 ± 100
1590 ± 159 NA
2010 ± 201 NA
2490 ± 249 NA
3060 ± 306 NA
4450 ± 445 NA
6180 ± 618 NA
8340 ± 834 NA
10930 ± 1093 NA
14020 ± 1402 NA
flowserve.com
N-m
110 ± 11
190 ± 19
260 ± 26
380 ± 38
530 ± 53
750 ± 75
1030 ± 103
1360 ± 136
NA
NA
NA
NA
NA
NA
NA
NA
NA
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