Instruction manual

Instruction Manual
D500240X012
A31A Valve
October 2012
5
Valve Orientation
Note
The NPS 10 through 12 CL150 valves and NPS 8 through 12 CL300 valves have a two-piece shaft. The shaft with the keyed end is
called the drive shaft. The shaft opposite the drive shaft is called the follower shaft.
The NPS 3 through 8 CL150 valves and NPS 3 t hrough 6 CL300 valves have a one-piece shaft. This one-piece shaft is keyed and is
called the drive shaft.
Whenever possible, install the valve with the shaft in the horizontal position as shown in figure 5.
Horizontal installation can enhance valve performance because process 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.
Table 3. Valve Body Data, CL150
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 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
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 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
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.
The A31A v alve is designed for installation with the shaft(s) in any orientation around the pipeline: horizontal, vertical,
or at an intermediate angle. However, when installing the valve in certain services, follow the recommendations
below, which are based on application experience:
D In certain services (process fluids with high concentrations of entrained solids, abrasive slurries, polymerizing
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 enhance 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 i n a specific application, contact your Emerson Process
Management sales office.