Type A31A
8
Table 5. Hex Head Screw, Stud Bolt and Cap Screw Data
(1)
VALVE
SIZE
NUMBER
SIZE DIA. INCH &
THREAD
LENGTH, INCH
SIZE,
INCH
Class
150
Class
300
Class
150
Class
300
Class
150
Class
300
Single-Flange Style with Stud Bolts
3
4
8
5/8-11
3/4-10
5-3/4
6
4
8
8
5/8-11
3/4-10
6
6-1/2
6
8
12
3/4-10
3/4-10
6-1/2
7-1/2
8
8
12
3/4-10
7/8-9
7
9
10
12
16
7/8-9
1-8
8
10
12
12
16
7/8-9
1-1/8-8
8-1/2
11
Wafer-Style with Cap Screws
3
8
16
5/8-11
3/4-10
1-7/8
2
4
16
16
5/8-11
3/4-10
2
2-1/4
6
16
24
3/4-10
3/4-10
2
2-1/2
8
16
24
3/4-10
7/8-9
2-1/4
3
10
24
32
7/8-9
1-8
2-1/2
3
12
24
32
7/8-9
1-1/8-8
2-3/4
3-3/8
1. Thread engagement in accordance with ANSI B31.3 “Chemical Plant and
Petroleum Refinery Piping”.
fourth of the final desired torque. When the final torque
value has been applied, tighten each flange bolt again
to allow for gasket compression.
5. For hazardous atmosphere or oxygen service
valves, read the following Warning, and provide the
bonding strap assembly mentioned below if the valve
is used in an explosive atmosphere.
WARNING
The valve drive shaft is not necessarily
grounded to the pipeline when installed.
Personal injury or property damage
could result, if the process fluid or the
atmosphere around the valve is flam-
mable, from an explosion caused by a
discharge of static electricity from the
valve components. If the valve is
installed in a hazardous area, electrical-
ly bond the drive shaft to the valve.
Note
The packing is composed of all conduc-
tive packing rings (graphite ribbon
packing) to electrically bond the shaft to
the valve for hazardous area service or
non-conductive PTFE packing rings. For
oxygen service applications, provide al-
ternate shaft-to-valve body bonding ac-
cording to the following step.
6. Attach the bonding strap assembly (key 131,
figure 6) to the shaft with the clamp (key 130,
figure 6).
Figure 4. Optional Shaft-to-Valve Body Bonding Strap
Assembly
VALVE BODY
ACTUATOR
A
A
VIEW A-A
37A6528-A
A3143-2/IL
7. Connect the other end of the bonding strap assem-
bly to the valve flange cap screws.
8. For more information, refer to the
Packing Mainte-
nance section below.
Installing Single-Flange Valves
WARNING
The edges of a rotating valve disk have
a shearing effect that may result in per-
sonal injury. To avoid personal injury,
keep clear of the disk edges when rotat-
ing the disk.
1. See figure 5 for recommended valve orientation.
See table 5 for hex head cap screw specifications.
2. Properly orient the valve according to the specific
application. For optimum performance, install the valve
for reverse flow.
3. Position the valve between the flanges. Be sure to
leave enough room for the flange gaskets. Install the
lower flange bolts.
4. Select the appropriate gaskets for the application.
Flat sheet, spiral wound, or other gasket types, made
to the ANSI B16.5 group standard or user’s standard,
can be used on the valve depending on the service
conditions of the application. Install the gaskets and
align the valve and the gaskets.
5. Install the remaining bolts.
6. Tighten the flange bolts in an alternating criss-
cross fashion to a torque value of one-fourth of the
