Emerson Fisher POSI-SEAL A81 User manual

www.Fisher.com
FisherrPOSI‐SEALtA81 Rotary Valve
Contents
Introduction 1...................................
Scope of Manual 1............................
Specifications 2...............................
Description 4.................................
Installation 4....................................
Maintenance 8..................................
Packing Maintenance 9........................
Replacing the Seal Ring Assembly 12..............
Replacing the Disk, Shafts, or Bearings 13..........
Actuator Mounting 18.........................
Parts Ordering 18
................................
Parts Kits 19...................................
Parts List 20...................................
Figure 1. Fisher A81 Valve with FieldQ™ Actuator
W9479
Introduction
Scope of Manual
This instruction manual includes installation, maintenance, and parts information for the Fisher POSI‐SEAL A81 valve,
DN50 through DN300 or NPS 2 through NPS 12 (figure 1). Refer to separate instruction manuals for information
covering the power on‐off actuator and accessories.
Do not install, operate, or maintain an A81 valve without being fully trained and qualified in valve, actuator, and
accessory installation, operation, and maintenance. To avoid personal injury or property damage, it is important to
carefully read, understand, and follow all the contents of this manual, including all safety cautions and warnings. If you
have any questions about these instructions, contact your Emerson Process Management sales office before
proceeding.
Instruction Manual
D103302X012
A81 Valve
January 2011

Instruction Manual
D103302X012
A81 Valve
January 2011
2
Table 1. Fisher A81 Valve Specifications
Specifications EN ASME
Valve Body Size DN 50, 80, 100, 150, 200, 250, and 300 NPS 2, 3, 4, 6, 8, 10, and 12
Pressure Rating PN 10 to 40 per EN 12516‐1 CL150 and 300 per ASME B16.34
Valve Body Materials
EN 1.0619 steel WCC steel
EN 1.4409 stainless steel CF3M (316L) stainless steel
CW2M(1) CW2M(1)
M35‐2(1) M35‐2(1)
Disk Materials
PTFE Seal
EN 1.4409 stainless steel CF3M stainless steel
CW2M CW2M
M35‐2 M35‐2
Metal or UHMWPE
Seal Chrome‐plated EN 1.4409 Stainless Steel Chrome‐plated CF3M Stainless Steel
End Connections Mates with raised‐face flanges
per EN 1092‐1
Mates with raised‐face flanges
per ASME B16.5
Valve Body Style Wafer (flangeless) and single flange with tapped holes
Face‐to‐Face Dimensions Meets MSS SP68, API 609, and EN 558 standards
Shutoff
PTFE or UHMWPE seal ring ‐ No visible leakage per MSS SP‐61
S31600 (316 SST) seal ring -0.1 scfh per unit of NPS (NPS 6 valve = 0.6 scfh)
per MSS SP-61
Flow Direction Standard (forward flow) is with the seal retainer facing upstream; reverse flow is permissible within specified
pressure drop limitations
Flow Characteristic Approximately linear
Disk Rotation Counterclockwise to open (when viewed from actuator side of valve body) through 90 degrees of disk
rotation
1. This material is not listed in EN 12516-1 or ASME B16.34. See table 4 for pressure/temperature ratings.
Table 2. Valve Size, Shaft Diameter, and Approximate Weight
VALVE SIZE PRESSURE RATING SHAFT DIAMETER APPROXIMATE WEIGHT
Wafer‐Style Single‐Flange
DN NPS EN ASME mm Inches kg Pounds kg Pounds
50 2 PN10‐40 CL150/300 12.7 1/2 4.7 10 6.7 15
80 3 PN10‐40 CL150/300 15.9 5/8 7.5 17 11.2 25
100 4 PN10‐40 CL150/300 19.1 3/4 12.5 28 17.6 39
150 6 PN10‐40 CL150/300 25.4 1 15.7 35 26.5 58
200 8 PN10‐16 CL150 31.8 1‐1/4 30.2 67 40.2 89
PN25‐40 CL300 31.8 1‐1/4 33.9 75 46.0 102
250 10 PN10‐16 CL150 31.8 1‐1/4 38.9 86 50.5 111
PN25‐40 CL300 31.8 1‐1/4 51.8 114 79.2 175
300 12 PN10‐16 CL150 38.1 1‐1/2 68.7 151 98.3 217
PN25‐40 CL300 38.1 1‐1/2 76.6 169 104.6 231

Instruction Manual
D103302X012
A81 Valve
January 2011
3
Table 3. Material Temperature Capabilities
MATERIAL TEMPERATURE
LIMITS(1)
EN Materials
Valve Body Shaft Bearing Lining and Jacket Seal Packing _C_F
1.0619 Steel S17400 or
S20910
PEEK / PTFE PTFE PTFE or Graphite –10 to 232 14 to 450
UHMWPE PTFE or Graphite –10 to 93 14 to 200
Metal PTFE or Graphite –10 to 232 14 to 450
R30006 (Alloy 6) Metal Graphite –10 to 400(2) 14 to 752(2)
1.4409
Stainless Steel
S20910 PEEK / PTFE PTFE PTFE or Graphite –10 to 232 14 to 450
UHMWPE PTFE or Graphite –10 to 93 14 to 200
Metal PTFE or Graphite –10 to 232 14 to 450
R30006 (Alloy 6) Metal Graphite –10 to 500(2) 14 to 932(2)
CW2M N10276 PEEK / PTFE PTFE PTFE –10 to 232 14 to 450
M35‐2 N05500 PEEK / PTFE PTFE PTFE –10 to 232 14 to 450
ASME Materials
Valve Body Shaft Bearing Lining and Jacket Seal Packing _C_F
WCC steel S17400 or
S20910
PEEK / PTFE PTFE PTFE or Graphite –29 to 232 -20 to 450
UHMWPE PTFE or Graphite –18 to 93 0 to 200
Metal PTFE or Graphite –29 to 232 -20 to 450
R30006 (Alloy 6) Metal Graphite –29 to 427(2) -20 to 800(2)
CF3M Stainless
Steel
S20910 PEEK / PTFE PTFE PTFE or Graphite –46 to 232 –50 to 450
UHMWPE PTFE or Graphite –18 to 93 0 to 200
Metal PTFE or Graphite –129 to 232 –200 to 450
R30006 (Alloy 6) Metal Graphite –129 to 454(2) –200 to 850(2)
CW2M N10276 PEEK / PTFE PTFE PTFE –46 to 232 –50 to 450
M35‐2 N05500 PEEK / PTFE PTFE PTFE –46 to 232 –50 to 450
1. Minimum allowable temperature for PN series flanges is -10_C (14_F). See requirements of EN 13445‐2 Annex B for applications below -10_C (14_F) with PN series flanges.
2. For applications exceeding 316_C (600_F), consult your Emerson Process Management sales office for appropriate disk material selection.
Table 4. Maximum Allowable Inlet Pressure for CW2M and M35‐2 Valves
TEMPERATURE CW2M(1) M35‐2(1)
150(2) 300(2) PN 10(2) PN 16(2) PN 25(2) PN 40(2) 150(2) 300(2) PN 10(2) PN 16(2) PN 25(2) PN 40(2)
_C Bar Bar
–46 to 38
50
100
150
200
232
20.0
19.5
17.7
15.8
13.8
12.7
51.7
51.7
51.5
50.3
48.3
47.0
10.0
9.9
9.4
9.4
9.1
9.1
16.0
15.9
15.1
15.1
14.6
14.6
25.0
24.8
23.6
23.6
22.9
22.9
40.0
39.6
37.8
37.8
36.6
36.6
18.3
18.2
17.7
15.8
14.0
12.8
47.9
47.9
47.8
47.2
45.6
45.5
9.3
9.3
9.3
9.3
9.0
9.0
15.2
15.2
15.1
14.8
14.5
14.5
23.8
23.8
23.7
23.4
22.5
22.4
37.9
37.9
37.8
37.2
36.3
36.2
_F Psig Psig
–50 to 100
200
300
400
450
290
260
230
200
185
750
750
730
700
680
145
144
137
133
133
232
230
219
212
212
362
359
342
331
331
580
575
548
530
530
265
260
230
200
185
695
695
685
660
660
135
135
135
130
130
220
220
215
210
210
345
345
340
325
325
550
540
525
525
525
1. This material is not listed in EN 12516‐1 or ASME B16.34. Also see the Installation section.
2. The designations PN or 150 and 300 are used only to indicate relative pressure‐retaining capabilities and are not EN or ASME pressure‐temperature rating class designations.

Instruction Manual
D103302X012
A81 Valve
January 2011
4
Description
The A81 rotary valve with FieldQ rack‐and‐pinion actuator offers automated on‐off, quarter‐turn performance. FieldQ
is available in spring‐return and double‐acting piston designs.
The valve body meets PN 10 through PN 40, CL150, and CL300 ratings. Face‐to‐face and raised‐face dimensions meet
EN 593, API 609, and MSS‐SP68 standards. Retainer clips provide for versatility to mount and align the same wafer
style valve body in different piping configurations (ASME and EN ratings).
The A81 rotary valve features an eccentrically‐mounted disk with either soft or metal seal, providing capability for
enhanced shutoff. The interchangeable sealing technology allows for the same valve body to accept both soft and
metal seals.
Installation
Key numbers in this procedure are shown in figure 9 unless otherwise indicated.
WARNING
Always wear protective gloves, clothing and eyewear when performing any installation operations to avoid personal injury.
To avoid personal injury or property damage resulting from the bursting of pressure retaining parts, be certain the service
conditions do not exceed either the valve body rating or the flange joint rating, or other limits given in table 1 or on the
nameplate. Use pressure‐relieving or pressure‐limiting devices to prevent the service conditions from exceeding these
limits.
If installing into an existing application, also refer to the WARNING at the beginning of the Maintenance section on page 8
in this manual.
CAUTION
The valve configuration and construction materials were selected to meet particular pressure, temperature, pressure drop,
and controlled fluid conditions specified in the customer's order. Because some valve body/trim material combinations are
limited in their pressure drop and temperature range capabilities, do not apply any other conditions to the valve without
first contacting your Emerson Process Management sales office.
The maximum allowable inlet pressures for steel and stainless steel valve bodies are consistent with the
pressure‐temperature ratings shown in table 1, except where further limited by the trim and packing material
temperature capabilities given in table 3. Valves are also available in CW2M and M35‐2 valve body materials that are
not listed in EN 12516‐1 or ASME B16.34. Valve bodies constructed of these materials mate with EN and ASME flanges
but are not included in EN or ASME pressure‐temperature ratings and must not be installed in systems requiring
conformance to EN or ASME standards. Maximum allowable inlet pressures for A81 valve bodies made of CW2M or
M35‐2 construction materials are shown in table 4.
1. Install a three‐valve bypass around the control valve assembly if continuous operation is necessary during
inspection and maintenance of the valve body.
2. Inspect the valve body to be certain it is free of foreign material.
3. The valve is normally shipped as part of a control valve assembly, with an actuator mounted on the valve body.
If the valve body and actuator have been purchased separately or if the actuator has been removed for maintenance,
mount the actuator, and adjust actuator travel before inserting the valve body into the line. This is necessary due to

Instruction Manual
D103302X012
A81 Valve
January 2011
5
the measurements that must be made during the actuator adjustment process. Refer to the Actuator Mounting
section on page 18 of this manual and to the separate actuator instruction manual for mounting and adjusting
instructions before proceeding.
4. Inspect adjacent pipelines to be certain they are free of any foreign material, such as pipe scale or welding slag, that
could damage the valve body seating surfaces.
CAUTION
Damage to the disk (key 3) will occur if any pipe flanges or piping connected to the valve body interfere with the disk
rotation path. However, the disk can be rotated without interference when the valve body is installed between adjacent
pipe flanges or piping that has an inside diameter equal to or greater than either schedule 80 pipe or compatible EN pipe
sizes. If piping with a smaller inner diameter than specified above is connected to the valve, measure carefully to be certain
the disk rotates without interference before putting the valve into operation.
5. Flow is in the standard direction when the seal retainer (key 2) is facing upstream. Standard flow direction is also
indicated by the flow direction arrow cast into the valve body. Flow in the reverse direction is permissible within
allowable pressure drop limits.
CAUTION
A81 disk rotation is counterclockwise to open (when viewed from the actuator side of the valve body, see figure 7) through
90 degrees of disk rotation. Rotating the disk (key 3) past either the open or closed position could damage the seal and disk
sealing surfaces and could cause the disk to jam in the seal retainer.
6. With the disk in the closed position, install line flange gaskets, and insert the valve between the pipeline flanges.
Use either flat sheet gaskets or spiral‐wound gaskets with compression‐controlling centering rings. Spiral‐wound
gaskets without compression‐controlling centering rings are not recommended for this purpose.
7. Depending on valve size and pressure rating, the wafer style valve is centered in the pipeline using either retainer
clips or the flange bolt holes. (For valves that have four flange bolt holes in the valve body (key 1), each hole
engages one corresponding line flange stud.) Insert the valve between the flanges and use either the retainer clips
or install two or more line flange studs into the line flanges to help hold the valve in position while centering the
valve. Carefully center the valve on the flanges to ensure disk clearance.
D Select and install two pipeline gaskets.
Note
Lubricate line flange studs before inserting them into flanges. If necessary, provide additional support for the control valve
assembly because of its combined weight.
8. After centering the valve body, first lubricate and then install the remaining line flange bolting to secure the valve in
the pipeline. Tighten the nuts to the line flange studs in a crisscross pattern to ensure proper alignment of valve,
gaskets, and flanges.

Instruction Manual
D103302X012
A81 Valve
January 2011
6
Table 5. Stud Bolt Data
VALVE SIZE WAFER STYLE
PN 10 PN 16 PN 25 PN 40
DN
No. of
Stud
Bolts
Size Dia
&
Thread,
mm
A
Dimen‐
sion,
mm
No. of
Stud
Bolts
Size Dia
&
Thread,
mm
A
Dimen‐
sion,
mm
No. of
Stud
Bolts
Size Dia
&
Thread,
mm
A
Dimen‐
sion,
mm
No. of
Stud
Bolts
Size Dia
&
Thread,
mm
A
Dimen‐
sion,
mm
50 4 M16X2 120 4 M16X2 120 4 M16X2 130 4 M16X2 130
80 8 M16X2 130 8 M16X2 130 8 M16X2 140 8 M16X2 140
100 8 M16X2 140 8 M16X2 140 8 M20X2.5 150 8 M20X2.5 150
150 8 M20X2.5 150 8 M20X2.5 150 8 M24X3 170 8 M24X3 170
200 8 M20X2.5 160 12 M20X2.5 160 12 M24X3 190 12 M27X3 210
250 12 M20X2.5 170 12 M24X3 180 12 M27X3 210 12 M30X3.5 230
300 12 M20X2.5 180 12 M24X3 190 16 M27X3 230 16 M30X3.5 250
VALVE SIZE SINGLE FLANGE STYLE
PN 10 PN 16 PN 25 PN 40
DN
No. of
Stud
Bolts
Size Dia
&
Thread,
mm
B
Dimen‐
sion,
mm
No. of
Stud
Bolts
Size Dia
&
Thread,
mm
B
Dimen‐
sion,
mm
No. of
Stud
Bolts
Size Dia
&
Thread,
mm
B
Dimen‐
sion,
mm
No. of
Stud
Bolts
Size Dia
&
Thread,
mm
B
Dimen‐
sion,
mm
50 8 M16X2 80 8 M16X2 80 8 M16X2 85 8 M16X2 85
80 16 M16X2 85 16 M16X2 85 16 M16X2 90 16 M16X2 90
100 16 M16X2 85 16 M16X2 85 16 M20X2.5 100 16 M20X2.5 100
150 16 M20X2.5 100 16 M20X2.5 100 16 M24X3 110 16 M24X3 110
200 16 M20X2.5 100 24 M20X2.5 100 24 M24X3 120 24 M27X3 130
250 24 M20X2.5 110 24 M24X3 120 24 M27X3 130 24 M30X3.5 140
300 24 M20X2.5 120 24 M24X3 120 24 M27X3 140 24 M30X3.5 150
VALVE SIZE WAFER STYLE SINGLE FLANGE STYLE
CL150 CL300 CL150 CL300
NPS
No. of
Stud
Bolts
Size Dia
&
Thread,
Inch
A
Dimen‐
sion,
Inch
No. of
Stud
Bolts
Size Dia
&
Thread,
Inch
A
Dimen‐
sion,
Inch
No. of
Stud
Bolts
Size Dia
&
Thread,
Inch
B
Dimen‐
sion,
Inch
No. of
Stud
Bolts
Size Dia
&
Thread,
Inch
B
Dimen‐
sion,
Inch
2 4 5/8‐11 5 8 5/8‐11 5.25 8 5/8‐11 3.50 16 5/8‐11 3.75
3 4 5/8‐11 5.75 8 3/4‐10 6.5 8 5/8‐11 4.00 16 3/4‐10 4.25
4 8 5/8‐11 6 8 3/4‐10 7 16 5/8‐11 4.00 16 3/4‐10 4.50
6 8 3/4‐10 6.5 12 3/4‐10 7.5 16 3/4‐10 4.25 24 3/4‐10 4.75
8 8 3/4‐10 7 12 7/8‐9 9 16 3/4‐10 4.50 24 7/8‐9 5.50
10 12 7/8‐9 8 16 1‐8 10 24 7/8‐9 4.75 32 1‐8 6.25
12 12 7/8‐9 8.5 16 1‐1/8‐8 11 24 7/8‐9 5.00 32 1‐1/8‐8 7.00
Figure 2. Stud Bolts for Installation (also see table 5)
A3887 WAFER‐STYLE VALVE BODY A3886 SINGLE FLANGE‐STYLE VALVE BODY

Instruction Manual
D103302X012
A81 Valve
January 2011
7
WARNING
An A81 valve body is not necessarily grounded when installed in a pipeline. If the valve is used in a flammable or hazardous
atmosphere or for oxygen service, an explosion could result due to a discharge of static electricity from the valve
components. To avoid personal injury or property damage, always make sure the valve body is grounded to the pipeline
before putting the control valve assembly into operation in a flammable or hazardous atmosphere.
Note
Standard packings for the A81 valve are composed of all conductive packing rings (graphite ribbon packing) or partially conductive
packing rings (such as a carbon‐filled PTFE female adaptor with PTFE V‐ring packing) to electrically bond the shaft to the valve
body for hazardous area service. For oxygen service applications, provide alternate shaft‐to‐valve body bonding according to the
following step.
9. For oxygen service applications, attach the bonding strap assembly (key 131, figure 3) to the shaft with the clamp
(key 130, figure 3), and connect the other end of the bonding strap assembly to the valve body with the cap screw
(key 35). Secure each cap screw with a hex nut (key 36).
WARNING
Personal injury could result from packing leakage. Valve packing was tightened prior to shipment; however, the packing
might require some readjustment to meet specific service conditions.
Figure 3. Optional Shaft‐to‐Valve Body Bonding Strap Assembly

Instruction Manual
D103302X012
A81 Valve
January 2011
8
Figure 4. Packing Arrangement Details
STANDARD PACKING
PTFE V‐RING GRAPHITE RIBBON
GE39901‐A GE39986‐A
SINGLE PTFE PACKING
GE40113‐A
ENVIRO‐SEAL PACKING
GRAPHITE PACKING
GE40118‐A
THESE TWO SURFACES SHOULD REMAIN PARALLEL AS YOU ALTERNATELY AND EVENLY
TIGHTEN THE PACKING NUTS (KEY 28).
NOTES:
WITH CONDUCTIVE PACKING, THE FEMALE ADAPTOR IN PTFE V‐RING PACKING
IS CARBON‐FILLED PTFE.
APPLY LUBRICANT.
1
2
3
Valves with ENVIRO‐SEALtpacking systems will not require this initial re‐adjustment. See ENVIRO‐SEAL Packing
System for Rotary Valves Instruction Manual (D101643X012) for packing instructions. If you wish to convert your
present packing arrangement to ENVIRO‐SEAL packing, refer to the retrofit kits listed in the parts kit sub‐section on
page 19 of this manual.
Maintenance
Valve body parts are subject to normal wear and must be inspected regularly and replaced as necessary. The frequency
of inspection and replacement depends upon the severity of service conditions. Instructions are given in this section
for: replacing trim components, changing disk rotation or valve action, and mounting and adjusting the actuator.
As used in these instructions, actuator refers to power actuators (such as pneumatic diaphragm, piston actuators, and
rack and pinion actuators).

Instruction Manual
D103302X012
A81 Valve
January 2011
9
WARNING
Avoid personal injury and property damage from sudden release of process pressure or bursting of parts. Before performing
any maintenance operations:
D Do not remove the actuator from the valve while the valve is still pressurized.
D Always wear protective gloves, clothing, and eyewear when performing any maintenance operations.
D Disconnect any operating lines providing air pressure, electric power, or a control signal to the actuator. Be sure the
actuator cannot suddenly open or close the valve.
D Use bypass valves or completely shut off the process to isolate the valve from process pressure. Relieve process pressure
on both sides of the valve. Drain the process media from both sides of the valve.
D Vent the power actuator loading pressure and relieve any spring precompression.
D Use lock‐out procedures to be sure the above measures stay in effect while you work on the equipment.
D The valve packing box may contain process fluids that are pressurized, even when the valve has been removed from the
pipeline. Process fluids may spray out when removing the packing hardware or packing rings, or when loosening the
packing box pipe plug.
D Check with your process or safety engineer for any additional measures that must be taken to protect against process
media.
Packing Maintenance
Refer to figure 4 for available packing configurations. All maintenance operations in this section may be performed
with the valve in the line. Packing may be PTFE V‐ring or graphite.
An ENVIRO‐SEAL packing system is also available with the A81 valve. To install the ENVIRO‐SEAL packing system in an
existing valve, follow the instructions in the instruction manual included with the packing system (D101643X012). To
remove packing parts in a valve with the ENVIRO‐SEAL packing system, follow the procedures for valves with the
ENVIRO‐SEAL packing system in this section. Install the replacement packing following the instructions in the packing
system instruction manual (D101643X012).
Stopping Leakage
For valves with PTFE or graphite packing:
CAUTION
Tighten the packing flange only enough to prevent shaft leakage. Excessive tightening will only accelerate wear of the
packing and could produce higher torques on the valve.
Leakage around the packing followers can be stopped by tightening the packing flange nuts (key 28, figure 9).
If the packing is relatively new and tight on the shaft, and if tightening the packing flange nuts does not stop leakage,
the shaft may be worn or nicked so that a seal cannot be made. If the leakage comes from the outside diameter of the
packing, the leakage may be caused by nicks or scratches around the packing box wall. Inspect the shaft and packing
box wall for nicks and scratches when performing the packing replacement procedures.

Instruction Manual
D103302X012
A81 Valve
January 2011
10
For valves with the ENVIRO‐SEAL packing system:
Optimum performance of the ENVIRO‐SEAL packing system is obtained when the Belleville springs are tightened to
their “target load.” The target load is the point where the springs are compressed to 85% of their maximum deflection,
or nearly flat. Maximum deflection is when the springs are 100% compressed, or completely flat.
Under normal conditions, the packing nuts should not require re‐tightening. However, when servicing, if the springs
do not remain at the target load of 85% compression, retighten the packing box nuts according to the following
procedure:
1. Tighten the packing flange nuts alternately and evenly, keeping the packing flange parallel with the valve flange
(see figure 4), until the Belleville springs are compressed 100% (or completely flat).
D For PTFE packing, loosen each packing flange nut one half turn (180_of rotation).
D For Graphite packing, loosen each packing flange nut one quarter turn (90_of rotation).
The target load of 85% compression has now been reached. If leakage continues, replace the packing components as
described in the following procedures.
Replacing the Packing
To replace the packing, the actuator must be removed. Also, the valve should be removed from the pipeline to allow
proper readjustment of the disk position.
WARNING
The edges of a rotating disk have a shearing effect that may result in personal injury. To help prevent such injury, stay clear
of the disk edges when rotating the disk (key 3).
CAUTION
Damage to the disk (key 3) may occur if the disk is not closed when the valve is being removed from the pipeline. If
necessary, apply operating pressure to the actuator temporarily to retain the disk in the closed position while removing the
valve from the pipeline.
For valves with PTFE or graphite packing:
Key numbers in this procedure are shown in figure 9 unless otherwise indicated.
1. Isolate the control valve from the line pressure, release pressure from both sides of the valve body, and drain the
process media from both sides of the valve. If using a power actuator, also shutoff all pressure lines to the power
actuator, release all pressure from the actuator. Use lock‐out procedures to be sure the above measures stay in
effect while you work on the equipment.
CAUTION
When removing the actuator in the following step, use a wheel puller to separate the actuator parts from the valve shaft.
Do not drive the actuator parts off the valve shaft because this could damage valve trim components.