Instruction manual

Instruction Manual
D500240X012
A31A Valve
October 2012
4
CAUTION
When using an actuator, the actuator travel stops or the actuator travel (for actuators without adjustable stops) must be
adjusted so that the disk stop in the valve body does not absorb the output of the actuator. Failure to limit actuator travel
as described in the next step can result in damage to the valve shafts or other valve parts.
1. Locate the actuator travel stop that establishes the closed position of the valve disk. When adjusting the travel stop
or travel, make sure that the disk is from 0.001 to 0.030 inch (0.03 to 0.76 mm) away from the internal stop in the
valve body. This adjustment is necessary to be certain that the actuator output torque is fully absorbed by the
actuator travel stop or by the actuator. The internal travel stop in the valve body should not absorb any of the
actuator torque.
2. Before installing the valve/actuator assembly in the process line, cycle the valve several times to be sure the valve
disk returns to the proper position.
Table 2. Material Temperature Ratings
COMPONENT, ASME CLASS, MATERIAL OF CONSTRUCTION
TEMPERATURE RANGE
_F _C
Seal Ring SeeFigure2
Backup Ring
Soft Seal Fluorocarbon
EPR
Nitrile
PTFE
Chloroprene
Phoenix III Seal Fluorocarbon
EPR
Nitrile
Chloroprene
Cryogenic Seal Aluminum (Optional)
-20 to 400
-65 to 360
-20 to 200
-100 to 400
-45 to 300
-40 to 500
-80 to 400
-40 to 300
-65 to 300
-425 to 400
-29 to 204
-54 to 182
-29 to 93
-73 to 204
-43 to 149
-40 to 260
-62 to 204
-40 to 149
-59 to 149
-254 to 204
Shaft Packing
(1)
PTFE
Graphite In Oxidizing Media
In Inert or Reducing Media
-425 to 450
-425 to 1000
-425 to 1500
-254 to 232
-254 to 538
-254 to 816
Shaft
(2)
17-4PH H1025
17-4PH H1150M
N05500
N07718
S20910
-100 to 800
-320 to 800
-425 to 900
-425 to 1300
-320 to 1100
-73 to 427
-195 to 427
-254 to 482
-254 to 704
-196 to 593
Bearings
PEEK
(3)
(standard)
316 SST
PTFE Composition
Bronze
-100 to 500
-425 to 1500
-425 to 325
-425 to 500
-73 to 260
-254 to 816
-254 to 163
-196 to 260
Disk Hardfacing
Electroless Nickel Plating or hard chrome coating
CoCr-A
(4)
(Alloy 6)
-425 to 1000
-325 to 1500
-254 to 538
-198 to 816
1. These low temperature limits apply to the flowing media. Valve extensions provided for cryogenic service maintain higher temperatures at the packing box.
2. Shaft material may affect the valve pressure rating. Consult your Emerson Process Management sales office.
3. PEEK stands for PolyEtherEtherKetone
4. CoCr-A hardfacing degrades shutoff performance of the seal. Consult your Emerson Process Management sales office.