Emerson Fisher POSI-SEAL A31A Instruction Manual page 4

A31A Valve
February 2019
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
Soft Seal Fluorocarbon
Phoenix III Seal Fluorocarbon
Cryogenic Seal Aluminum (Optional)
Shaft Packing
Graphite In Oxidizing Media
In Inert or Reducing Media
17‐4PH H1025
17‐4PH H1150M
PEEK
PTFE Composition
Disk Hardfacing
Electroless Nickel Plating or hard chrome coating
CoCr‐A
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
3. PEEK stands for PolyEtherEtherKetone
4. CoCr‐A hardfacing degrades shutoff performance of the seal. Consult your Emerson sales office.
4
Seal Ring
Backup Ring
EPR
Nitrile
PTFE
Chloroprene
EPR
Nitrile
Chloroprene
(1)
PTFE
(2)
Shaft
N05500
N07718
S20910
Bearings
(3)
(standard)
316 SST
Bronze
(4)
(Alloy 6)
Emerson sales
_F
‐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
‐425 to 450
‐425 to 1000
‐425 to 1500
‐100 to 800
‐320 to 800
‐425 to 900
‐425 to 1300
‐320 to 1100
‐100 to 500
‐425 to 1500
‐425 to 325
‐425 to 500
‐425 to 1000
‐325 to 1500
office.
Instruction Manual
TEMPERATURE RANGE
_C
See Figure 2
‐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
‐254 to 232
‐254 to 538
‐254 to 816
‐73 to 427
‐195 to 427
‐254 to 482
‐254 to 704
‐196 to 593
‐73 to 260
‐254 to 816
‐254 to 163
‐196 to 260
‐254 to 538
‐198 to 816
D500240X012