Instruction manual

Instruction Manual
D500240X012
A31A Valve
October 2012
6
Table 4. Valve Body Data, CL300
VALVE SIZE,
NPS
SHAFT DIAMETER
AT YOKE BEARING
FACE-TO-FACE
DIMENSION
(1)
MINIMUM
I.D
.(2)
APPROXIMATE WEIGHT,
KILOGRAMS
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
VALVE SIZE,
NPS
SHAFT DIAMETER
AT YOKE BEARING
FACE-TO-FACE
DIMENSION
(1)
MINIMUM
I.D
.(2)
APPROXIMATE WEIGHT,
POUNDS
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
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 during installation, the valve must be in the fully-closed position. If the A31A valve is
equipped with a fail-open actuator, remove the actuator before installing 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 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 instruction manual
for detailed actuator mounting and adjustment procedures.
2. If not previously removed, remove the protective end coversfromthevalveandinspectthevalvebodytobecertain
that it is free of foreign material. Also, be certain that adjacent pipelines are free of any foreign material, such as
pipe scale or welding slag that could damage the valve seating surfaces.
CAUTION
TheA31Avalveisdesignedforusewiththeappropriatepiping schedule for the specified ASME class. Minimum inside
diameters for flanges or pipe mating with valves are shown in tables 3 and 4. Be certain to align the valve accurately to
avoid contact between the disk and the flanges. Improper alignment or insufficient space for disk rotation could result in
damage to the disk.
3. Select the appropriate gaskets for the application. Flat sheet, spiral wound, or other gasket types, made to ASME
B16.5 group or user's standard, can be used on the v alves depending on the s ervice conditions of the application.
4. Refer to table 5 for the quantity and size of flange bolts required.