Instruction manual

Instruction Manual
D500248X012
A31D Valve
April 2014
13
To install a new seal, O-ring (key 6), and retaining ring gasket, follow the appropriate instructions given below.
Table 5. Torque Values for Retaining Ring Screws
ASME CLASS AND VALVE SIZE, NPS
RETAINING RING SCREWS
Fastener Nominal Size N•m Lbf•in
CL150: NPS 3, 4, 8, and 10; NPS 3 and 4 #10 4.6 41
CL150: NPS 6 and 12; CL300:NPS 6, 8, 10, and 12 1/4 11 100
CL150: NPS 14, 16, 18, 20, and 24; CL300: NPS 14 and 16 5/16 25 220
CL300: NPS 18 and 20 3/8 45 400
CL300: NPS 24 1/2 112 996
Note: These values are based upon standard materials, S66286/N07718 s crews and ASTM A193GRB6 bolts. Fo r other special fastener materials, please contact your Emerson Process
Management sales office.
Table 6. Torque Values for Gasket Retainer Bolts
ASME CLASS AND VALVE SIZE, NPS
GASKET RETAINER BOLTS
Fastener Nominal Size N•m Lbf•in
CL150: NPS 3 and 10; NPS 3 5/16 19 167
CL150: NPS 4, 6, 8, 12, 14, 16, 18, 20, 24; CL300:NPS 4, 6, 8, 10, 12, 14 3/8 33 295
CL300: NPS 16 and 18 1/2 80 708
CL300: NPS 20 and 24 5/8 161 1428
Note: These values are based upon standard materials, S66286/N07718 s crews and ASTM A193GRB6 bolts. Fo r other special fastener materials, please contact your Emerson Process
Management sales office.
Figure 5. Typical Seal Installation
INTERNAL TRAVEL STOP
LARGEST OUTSIDE
DIAMETER (KEY 5)
CCW DISK
ROTATION
TO OPEN
ACTUATOR END
OF SHAFT
POSITION INDICATION MARK
INDICATES APPROXIMATE
DISK POSITION
GE62591-A
0.25 TO 0.76
(0.010 TO 0.030)
mm
(inch)
PTFE Seals
1. Locate the replacement seal ring (key 5) and note the shape of the ring. The ring is wider across one edge diameter
andnarroweracrosstheotheredgediameterasshowninfigure5.Aroundtheoutsidecircumferenceisonewide
groove.
Before installing the seal ring into the valve body, place the O-ring (key 6) into the wide, outer groove of the seal ring.
Refer to figure 5.