Type A31A
4
Table 3. Valve Body Data, Class 150
VALVE
SIZE,
INCHES
SHAFT
DIA.
AT YOKE
BEARING
FACE-TO-
FACE
DIMEN-
SION
(1)
MINI-
MUM
I.D
.(2)
APPROX.
WEIGHT,
POUNDS
INCHES
Inches
Wafer
Single-
Flange
3
9/16
1-7/8
2.82
19
21
4
11/16
2-1/8
3.69
28
32
6
15/16
2-1/4
5.80
45
49
8
15/16
2-1/2
7.70
61
67
10
1-1/8
2-13/16
10.00
73
95
12
1-1/4
3-3/16
11.76
105
141
VALVE
SIZE,
INCHES
SHAFT
DIA.
AT YOKE
BEARING
FACE-TO-
FACE
DIMEN-
SION
(1)
MINI-
MUM
I.D
.(2)
APPROX.
WEIGHT,
KILOGRAMS
INCHES
mm
Wafer
Single-
Flange
3
14.3
47.6
71.6
8.6
9.5
4
17.5
54.0
93.7
13
15
6
23.8
57.2
147.3
20
22
8
23.8
63.5
195.6
28
30
10
28.5
71.4
254.0
33
43
12
31.8
81.0
298.7
48
64
1. Face-to-face dimensions are in compliance with MSS SP68 and API 609
specifications.
2. Minimum I.D. is the minimum pipe or flange I.D. required for disk swing clearance.
fluid flow will sweep entrained solids
from valve surfaces, preventing particle
buildup on the seal. Also, installation of
the valve with the shaft horizontal will
extend bearing life because entrained
solids will be less likely to penetrate the
bearings.
The Type A31A valve is designed for installation with
the shaft(s) in any orientation around the pipeline: hori-
zontal, vertical, or at an intermediate angle. However,
when installing the valve in certain services, follow the
recommendations below, which are based on applica-
tion experience:
D
In certain services (process fluids with high con-
centrations of entrained solids, abrasive slurries, poly-
merizing media, or large diameter valves with high
flow rates), installing the valve with the shaft horizontal
to the pipeline and downstream of the seal will en-
hance valve performance.
D
Install a valve supplied for uni-directional shutoff
with the high pressure side in the direction noted on
the valve body. A flow tag with an arrow is provided for
proper installation.
If you have questions about proper valve orientation in
a specific application, contact your Fisher Controls
representative or sales office.
Table 4. Valve Body Data, Class 300
VALVE
SIZE,
INCHES
SHAFT
DIA.
AT YOKE
BEARING
FACE-TO-
FACE
DIMEN-
SION
(1)
MINI-
MUM
I.D
.(2)
APPROX.
WEIGHT,
POUNDS
INCHES
Inches
Wafer
Single-
Flange
3
9/16
1-7/8
2.82
20
23
4
11/16
2-1/8
3.69
28
31
6
15/16
2-5/16
5.80
44
54
8
1-1/4
2-7/8
7.33
67
91
10
1-5/8
3-5/16
9.10
134
166
12
1-7/8
3-5/8
11.09
171
235
VALVE
SIZE,
INCHES
SHAFT
DIA.
AT YOKE
BEARING
FACE-TO-
FACE
DIMEN-
SION
(1)
MINI-
MUM
I.D
.(2)
APPROX.
WEIGHT,
KILOGRAMS
INCHES
mm
Wafer
Single-
Flange
3
14.3
47.6
71.6
9.1
10
4
17.5
54.0
93.7
13
14
6
23.8
58.7
147.3
20
25
8
31.8
73.0
186.2
30
41
10
41.3
84.1
231.1
61
75
12
47.6
92.1
281.7
78
107
1. Face-to-face dimensions are in compliance with MSS SP68 and API 609
specifications.
2. Minimum I.D. is the minimum pipe or flange I.D. required for disk swing clearance.
Preparing for Installation
CAUTION
To avoid damage to the valve disk dur-
ing installation, the valve must be in the
fully-closed position. If the Type A31A
valve is equipped with a fail-open actua-
tor, remove the actuator before instal-
ling the valve/actuator assembly or
cycle the valve into the fully closed
position. Then, take appropriate steps to
ensure that the actuator does not cause
the valve to open during installation.
1. The Type A31A valve is normally shipped as part
of an assembly with an actuator and other accessories
such as a valve positioner. If the valve and actuator
have been purchased separately or if the actuator has
been removed for maintenance, properly mount the
actuator and adjust valve/actuator travel and all travel
stops before inserting the valve into the line.
Follow the instructions in this manual for adjusting
travel stops. Also, refer to a separate actuator instruc-
tion manual for detailed actuator mounting and adjust-
ment procedures.
2. If not previously removed, remove the protective
end covers from the valve and inspect the valve body
to be certain that it is free of foreign material. Also, be
