Emerson Fisher Posi Seal A81 Data Sheet

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Product Bulletin

A81 Valve

21.1:A81
July 2012

D103301X012

Fisherr POSI-SEAL™ A81 Rotary Valve
The Fisher POSI-SEAL A81 rotary valve with FieldQt
rack-and-pinion actuator offers automated on-off,
quarter-turn performance. It 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 dimensions meet EN
558, API 609, and MSS-SP68 standards. Line centering
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 eccentricallymounted 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.
The actuator sizing and selection process is improved
by simply reading a table for information.

W9479

A81 Features


Quarter-turn performance– The valve has a square
shaft-to-actuator connection and offers automated
on-off, quarter-turn performance.



Global Standards– The valve meets API, ASME, and
EN standards, making it suitable for use in all world
areas. An optional mounting bracket provides ISO
5211 actuator mounting capability.



PEEK/PTFE bearing as standard– The PTFE-lined
PEEK bearing is a low friction, low wear bearing. It
allows the valve to operate under high pressure
drops for a high cycle life while maintaining low
torque. The drop-in bearing design enables fast,
easy maintenance.

www.Fisher.com



Improved shaft-disk pinning– The improved
expansion pin system ensures there is a positive,
durable connection between disk and shaft. This
reduces backlash and wear in the drive system,
optimizing long-term performance. It also makes
disassembly for maintenance quick and simple with
no need for special tools.



New Spring-Loaded Shaft– The spring in the
outboard shaft provides support to the drive train
and disk, enabling the shaft to be installed in both
horizontal and vertical orientations with no
detriment to performance or cycle life. This
complements the ability to mount the actuator on
the left- or right-hand side, enabling access for any
installation.

Product Bulletin

A81 Valve

21.1:A81
July 2012



Excellent Emissions Capabilities– The optional
ENVIRO-SEALt packing systems, are designed with
very smooth shaft surfaces and live-loading to
provide improved sealing, guiding, and loading
force transmission. The seal of the ENVIRO-SEAL
system can control emissions to below 100 ppm
(parts per million).



Sour Service Capability– Depending on material
selection, some trim and bolting materials are
available for applications involving sour liquids and
gases. These constructions comply with NACE
MR0175-2002, MR0103, and MR0175 / ISO 15156.
Contact your Emerson Process Management sales
office for more information.



Easy Installation– Line-centering clips engage the
line flange bolts to simplify installation and provide
for centering of wafer-style valves in the pipeline.
End connections are compatible with EN and ASME
standards.



Excellent Shutoff– Both the metal and soft seal
rings have pressure-assisting sealing action that
ensures tight shutoff regardless of pressure drop.



Long Seal Life– The opening and closing path of the
eccentric disk minimizes disk contact with the seal
ring, thereby reducing seal wear, undue friction,
and seating torque requirements. See
figure 2.

D103301X012



Reliable Flange Gasketing Surface– The seal
retainer screws and retention clips are outside the
gasket surface of the seal retainer. Spiral-wound or
flat-sheet gaskets can be installed between the
uninterrupted seal retainer face and the pipeline
flange.



Integral Shaft-to-Valve Body Bonding– Standard
valve construction includes conductive packing to
provide electrical bonding for hazardous area
applications.



Powder paint as standard– The Emerson Process
Managementt powder paint finish offers an
excellent corrosion-resistant finish to all steel parts.



High Temperature Capability– The valve will
operate at elevated temperatures, with the
appropriate trim components.



Shaft Retention– Redundant shaft retention
provides added protection. The packing follower,
anti-blowout ring, and shaft groove interact to hold
the shaft securely in the valve body (see figure 1).



Travel Indication– Additional travel indication can
be achieved by using the indication line on the
shaft, along with the disk position markings on the
packing follower (see figure 4).

Table of Contents
A81 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
A81 Valve Specifications and
Materials of Construction . . . . . . . . . . . . . . . . . . . . 3

2

FieldQ Actuator Features . . . . . . . . . . . . . . . . . . . . . . 16

Product Bulletin

A81 Valve

21.1:A81
July 2012

D103301X012

A81 Valve Specifications and Materials of Construction
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 / 300 per ASME B16.34

Valve Body Materials

PTFE or RPTFE(4) Seal
Disk Materials

WCC steel

EN 1.4409 stainless steel

CF3M (316L) stainless steel

LCC

LCC

CW2M(1)

CW2M(1)

M35-2(2)

M35-2

EN 1.4409 stainless steel

CF3M stainless steel

CW2M

CW2M

M35-2

M35-2

Chrome-plated EN 1.4409 Stainless Steel

Chrome-plated CF3M Stainless Steel

Mates with raised-face flanges per EN 1092-1

Mates with raised-face flanges per ASME B16.5

Metal or UHMWPE(3)
Seal
End Connections

EN 1.0619 steel

Wafer (flangeless) and single flange with tapped or through holes(5)

Valve Body Style
Face-to-Face Dimensions

Meets MSS SP68, API 609, and EN 558 standards
PTFE, RPTFE, or UHMWPE seal ring - No visible leakage per MSS SP-61

Shutoff

S31600 (316 SST) seal ring - 0.1 scfh per unit of NPS (NPS 6 valve = 0.6 scfh) per MSS SP-61

Flow Coefficients

See Fisher Catalog 12

Flow Direction

Standard (forward flow) is with the seal retainer facing upstream; reverse flow is permissible for soft seals only

Flow Characteristic

Approximately linear

Disk Rotation

Counterclockwise to open (when viewed from actuator side of valve body) through 90 degrees of disk rotation

Shaft Diameters and Approximate Weights

See table 8

1. This material is not listed in EN 12516-1 or ASME B16.34. See figure 6 for pressure/temperature ratings.
2. This material is not listed in EN 12516-1. See figure 6 for pressure/temperature ratings.
3. UHMWPE stands for ultra high molecular weight polyethylene.
4. RPTFE is a reinforced PTFE seal.
5. LCC construction is standard in wafer style only. Consult your Emerson Process Management sales office for single flange valve body style information.

Table 2. Materials (Other Valve Components)
Component

Material

Shafts and Pins

S17400 (17-4PH) stainless steel, S20910 (XM-19) stainless steel, N10276, N05500

Anti-blowout Ring

N07718

Seal

PTFE, RPTFE, or UHMWPE with S31600 (316 stainless steel) or R30003 spring. Metal seal is 316 stainless steel with graphite gaskets

Bearings

PEEK/PTFE, R30006 (Alloy 6), S31600 Nitride

Packing

PTFE/carbon-filled PTFE (standard), graphite die-molded ribbon, ENVIRO-SEAL PTFE packing, ENVIRO-SEAL graphite packing

Follower Spring

N07718 with carbon-filled PEEK or S31600 spring seats

Bolting

B8M Class 2, B7M, N05500, N07718

Nuts

8M, 2HM, N04400, N10276

Table 3. Trim Combinations with Standard Construction Materials
Valve Body Material
1.0619 & WCC
LCC
1.4409 & CF3M

Shaft Material
S17400 H1075
S17400 H1075
S20910

Disk Material

Bearings

Seal Material

1.4409 & CF3M

PEEK/PTFE

PTFE or RPTFE

PEEK/PTFE

UHMWPE or Metal

Alloy 6 or S31600 Nitride

Metal

1.4409 & CF3M Chrome-Plated
1.4409 & CF3M

PEEK/PTFE

PTFE

1.4409 & CF3M

PEEK/PTFE

PTFE or RPTFE

PEEK/PTFE

UHMWPE or Metal

1.4409 & CF3M Chrome-Plated

Alloy 6 or S31600 Nitride

Metal

CW2M

N10276

CW2M

PEEK/PTFE

PTFE or RPTFE

M35-2

N05500

M35-2

PEEK/PTFE

PTFE or RPTFE

3

Product Bulletin

A81 Valve

21.1:A81
July 2012

D103301X012

Figure 1. Typical Fisher A81 Valve Construction Detail

RETAINER CLIP (LINE
CENTERING CLIP)

ANTI-BLOWOUT
RING

FOLLOWER
SHAFT
EXPANSION PIN
AND TAPER PIN

DRIVE SHAFT

BEARING

RETAINER
CLIP

RETAINER
CLIP

VALVE BODY

SEAL
RETAINER

SEAL
RETAINER

SEAL RING

SEAL RING

DISK

DISK

GE36289-A

4

SOFT SEAL

METAL SEAL

Product Bulletin

A81 Valve

21.1:A81
July 2012

D103301X012

Figure 2. Comparison of Disk Action

SEAL RING (SOFT SEAL
CONSTRUCTION
SHOWN)
ECCENTRIC
DISK CENTER
OF ROTATION
CENTERLINE OF
VALVE BODY

OPEN

CONVENTIONAL
DISK CENTER
OF ROTATION

CONVENTIONAL
DISK PATH
OF ROTATION
ECCENTRIC
DISK PATH
OF ROTATION

ECCENTRIC
DISK

CONVENTIONAL
DISK

VALVE BODY

GE36289-A

DISK FULLY CLOSED

DISK FULLY OPEN

Figure 3. Available Seal Configuration
VALVE BODY

SEAL
RETAINER

VALVE
BODY

SPRING

PRESSURE-ASSISTED
SEAL

PRESSUREASSISTED
SEAL

SEAL
RING

HIGH
PRESSURE
SHUTOFF

HIGH
PRESSURE
SHUTOFF
DISK
FACE
B1558-3

SEAL
RETAINER

DISK FACE

METAL SEAL

SOFT SEALS

5

Product Bulletin

A81 Valve

21.1:A81
July 2012

D103301X012

Figure 4. Travel Indication

GE36289

Table 4. Material Temperature Capabilities
MATERIAL

TEMPERATURE LIMITS
PN FLANGES

Valve Body

Shaft

Bearing Lining and Jacket

Seal

Packing

_C

_F

1.0619 Steel

S17400 or S20910

PEEK / PTFE

PTFE or RPTFE

PTFE or Graphite

—10 to 232

14 to 450

UHMWPE
Metal

PTFE or Graphite

—10 to 93

14 to 200

PTFE

—10 to 232

14 to 450

Graphite

—10 to 260

14 to 500

Graphite

—10 to 400(1)

14 to 752(1)

R30006 (Alloy 6) or S31600 Nitride

Metal

LCC

S17400 or S20910

PEEK / PTFE

PTFE

PTFE

—46 to 232

—50 to 450

1.4409
Stainless
Steel

S20910

PEEK / PTFE

PTFE or RPTFE

PTFE or Graphite

—46 to 232

—50 to 450

UHMWPE
Metal

PTFE or Graphite

—18 to 93

0 to 200

PTFE

—46 to 232

—50 to 450

Graphite

—46 to 260

—50 to 500

R30006 (Alloy 6) or S31600 Nitride

Metal

Graphite

—46 to 500(1)

—50 to 932(1)

CW2M

N10276

PEEK / PTFE

PTFE or RPTFE

PTFE

—10 to 232

14 to 450

M35-2

N05500

PEEK / PTFE

PTFE or RPTFE

PTFE

—10 to 232

14 to 450

ASME FLANGES
Valve Body

Shaft

Bearing Lining and Jacket

Seal

Packing

_C

_F

WCC steel

S17400 or S20910

PEEK / PTFE

PTFE or RPTFE

PTFE or Graphite

—29 to 232

-20 to 450

UHMWPE
Metal

PTFE or Graphite

—18 to 93

0 to 200

PTFE

—29 to 232

-20 to 450

R30006 (Alloy 6) or S31600 Nitride

Metal

Graphite

—29 to 260

-20 to 500

Graphite

—29 to 427(1)

-20 to 800(1)

LCC

S17400 or S20910

PEEK / PTFE

PTFE

PTFE

—46 to 232

—50 to 450

CF3M
Stainless
Steel

S20910

PEEK / PTFE

PTFE or RPTFE

PTFE or Graphite

—46 to 232

—50 to 450

UHMWPE
Metal

PTFE or Graphite

—18 to 93

0 to 200

PTFE

—46 to 232

—50 to 450

Graphite

—46 to 260

—50 to 500

R30006 (Alloy 6) or S31600 Nitride

Metal

Graphite

—46 to 454(1)

—50 to 850(1)

CW2M

N10276

PEEK / PTFE

PTFE or RPTFE

PTFE

—46 to 232

—50 to 450

M35-2

N05500

PEEK / PTFE

PTFE or RPTFE

PTFE

—46 to 232

—50 to 450

1. For applications exceeding 316_C (600_F), consult your Emerson Process Management sales office for appropriate disk material selection.

6

A81 Valve

D103301X012

Product Bulletin

21.1:A81
July 2012

Figure 5. Material Pressure/Temperature Curves

7

Product Bulletin

A81 Valve

21.1:A81
July 2012

D103301X012

Figure 6. Material Pressure/Temperature Curves
1

2

1. CW2M is not listed in EN 12516-1 or ASME B16.34. The PN and CL designations are used only to indicate relative pressure-retaining capabilities.
2. M35-2 is not listed in EN 12516-1. The PN designations are used only to indicate relative pressure-retaining capabilities.

8

A81 Valve

D103301X012

Product Bulletin

21.1:A81
July 2012

Figure 7. Material Pressure/Temperature Curves

E1140

9

Product Bulletin

A81 Valve

21.1:A81
July 2012

D103301X012

Table 5. Maximum Allowable Shutoff Pressure Drops based on Trim (Seal, Shaft, and Bearings), Bar
Note: Do not exceed the EN or ASME pressure/temperature rating of the valve or mating flanges.
DN
TRIM

TEMPERATURE, _C

50

80

100

150

200

250

300

Bar

PTFE or RPTFE Seal
PEEK/PTFE Bearings

-46 to 65
93
121
149
191
204
232

51.7
48.5
38.6
28.7
13.8
10.3
3.4

51.7
48.5
38.6
28.7
13.8
10.3
3.4

51.7
48.5
38.6
28.7
13.8
10.3
3.4

51.7
48.5
38.6
28.7
13.8
10.3
3.4

51.7
48.5
38.6
28.7
13.8
10.3
3.4

35.2
35.0
33.8
28.7
13.8
10.3
3.4

41.4
38.8
35.7
28.7
13.8
10.3
3.4

UHMWPE Seal
PEEK/PTFE Bearings

-17 to 37
66
93

51.7
38.6
25.9

51.7
38.6
25.9

51.7
38.6
25.9

51.7
38.6
25.9

51.7
38.6
25.9

35.2
35.1
25.9

41.4
38.6
25.9

Metal Seal(1)
Alloy 6 Bearings

-46 to 37
93
149
204
260
316
371
427
454

18.5
17.0
16.0
15.1
14.3
13.8
13.2
12.5
12.1

16.5
15.1
14.2
13.4
12.8
12.3
11.9
11.6
11.5

13.9
12.8
12.0
11.4
10.8
10.3
10.0
9.8
9.7

12.8
11.7
11.0
10.4
9.9
9.5
9.2
9.0
8.9

11.0
10.1
9.4
9.0
8.5
8.2
7.9
7.7
7.7

6.8
6.3
5.9
5.6
5.3
5.1
5.0
4.8
4.8

7.0
6.5
6.1
5.7
5.4
5.2
5.0
5.0
4.9

Metal Seal(1)
S31600/Nitride
Bearings

-46 to 37
93
149
204
260
316
371
427
454

19.5
19.3
17.0
15.9
14.5
13.8
13.2
12.5
12.1

22.4
22.4
22.4
22.4
22.4
22.1
21.5
20.7
20.3

26.1
26.0
23.7
22.7
21.4
20.8
20.2
19.5
19.2

20.8
20.6
18.7
17.8
16.8
16.2
15.7
15.2
14.9

27.6
27.6
27.6
26.3
24.6
23.2
22.4
21.8
21.6

12.8
12.8
12.8
12.8
12.5
12.1
11.8
11.4
11.2

8.0
7.9
7.1
6.8
6.3
6.1
5.9
5.6
5.4

Metal Seal(1)
PEEK/PTFE Bearings

-46 to 37
93
149
204
232
260

51.7
51.7
50.3
48.6
47.2
24.7

51.7
51.7
50.3
48.6
47.2
21.9

51.7
51.7
50.3
48.6
46.3
18.5

51.7
51.7
50.3
48.2
42.6
17.0

31.0
31.0
31.0
31.0
31.0
14.6

17.2
17.2
17.2
17.2
17.2
9.1

17.2
17.2
17.2
17.2
17.2
9.4

1. Pressure drops shown for metal seals are for forward flow only.

10

Product Bulletin

A81 Valve

21.1:A81
July 2012

D103301X012

Table 6. Maximum Allowable Shutoff Pressure Drops based on Trim (Seal, Shaft, and Bearings), Psi
Note: Do not exceed the EN or ASME pressure/temperature rating of the valve or mating flanges.
NPS
TRIM

TEMPERATURE, _F

2

3

4

6

8

10

12

Psi

PTFE or RPTFE Seal
PEEK/PTFE Bearings

-50 to 150
200
250
300
375
400
450

750
704
560
416
200
150
50

750
704
560
416
200
150
50

750
704
560
416
200
150
50

750
704
560
416
200
150
50

750
704
560
416
200
150
50

511
508
490
416
200
150
50

600
563
518
416
200
150
50

UHMWPE Seal
PEEK/PTFE Bearings

0 to 100
150
200

750
560
375

750
560
375

750
560
375

750
560
375

750
560
375

511
509
375

600
560
375

Metal Seal(1)
Alloy 6 Bearings

-50 to 100
200
300
400
500
600
700
800
850

268
246
232
219
208
200
192
181
176

239
219
206
195
186
178
172
168
167

202
185
174
165
157
150
145
142
141

185
170
160
151
144
138
134
130
129

159
146
137
130
124
119
115
112
111

99
91
86
81
77
74
72
70
69

102
94
88
83
79
76
73
72
71

Metal Seal(1)
S31600/Nitride
Bearings

-50 to 100
200
300
400
500
600
700
800
850

283
280
246
230
211
200
192
181
176

325
325
325
325
325
321
312
300
295

379
377
344
329
311
301
293
283
278

301
299
271
258
243
235
228
220
216

400
400
400
382
357
337
325
316
313

185
185
185
185
182
176
171
165
162

116
115
103
98
91
88
85
81
79

Metal Seal(1)
PEEK/PTFE Bearings

-50 to 100
200
300
400
450
500

750
750
730
705
685
358

750
750
730
705
685
318

750
750
730
705
672
269

750
750
730
699
618
247

450
450
450
450
450
212

250
250
250
250
250
132

250
250
250
250
250
136

1. Pressure drops shown for metal seals are for forward flow only.

Table 7. ISO 5211 F Sizes Available with Optional Mounting Bracket
VALVE SIZE

ISO 5211 F SIZES

DN

NPS

50

2

80

3

F07, F10

100

4

F07, F10, F12, F14, F16

150

6

F07, F10, F12, F14, F16

200

8

F10, F12, F14, F16

250

10

F10, F12, F14, F16

300

12

F10, F12, F14, F16

F07, F10

11

Product Bulletin

A81 Valve

21.1:A81
July 2012

D103301X012

Table 8. Dimensions and Weights
VALVE SIZE /
PRESSURE RATING

A

C

D

F

E
(4)

G
(5)

(4)

K

R

S(1)

T

U

W

(5)

APPROXIMATE
WEIGHT(2)
(4)

mm
DN50/
NPS 2

PN10-40/
CL150300

DN80/
NPS 3

PN10-40/
CL150300

DN100/
NPS 4
DN150/
NPS 6

DN200/
NPS 8

DN250/
NPS 10

DN300/
NPS 12

kg

43

9

15

74

150

---

109

---

125

102

12.7

117

---

14

4.7

6.7

47/
48

11

15

76

196

196

133

133

130

134

15.9

117

---

14

7.5

11.2

PN10-40/
CL150300

53

14

19

103

222

226

122

147

172

162

19.1

152

32

14

12.5

17.6

PN10-40/
CL150300

57

19

25

108

270

300

147

182

205

218

25.4

152

32

14

15.7

26.5

PN10-16/
CL150

61

22

30

107

327

342

225

225

258

271

31.8

235

46

18

30.2

40.2

PN25-40/
CL300

73

22

30

107

358

364

225

225

258

285

31.8

235

46

18

33.9

46.0

PN10-16/
CL150

69

22

30

109

390

395

218

250

270

324

31.8

235

46

18

38.9

50.5

PN25-40/
CL300

83

22

30

109

400

450

265

265

270

345

31.8

235

46

18

51.8

79.2

PN10-16/
CL150

78

27

35

114

381

467

309

309

304

381

38.1

235

46

18

68.7

98.3

PN25-40/
CL300

92

27

35

114

410

512

309

309

304

410

38.1

235

46

18

76.6

105

(3)

Inches
DN50/
NPS 2

PN10-40/
CL150300

DN80/
NPS 3

PN10-40/
CL150300

DN100/
NPS 4
DN150/
NPS 6

DN200/
NPS 8

DN250/
NPS 10

DN300/
NPS 12

lbs

1.69

0.35

0.59

2.91

5.91

---

4.29

---

4.92

4.02

0.50

4.62

---

0.55

10

15

1.85/
1.89

0.43

0.59

2.99

7.72

7.72

5.24

5.24

5.12

5.28

0.63

4.62

---

0.55

17

25

PN10-40/
CL150300

2.09

0.55

0.75

4.06

8.74

8.90

4.80

5.79

6.77

6.38

0.75

6.00

1.25

0.55

28

39

PN10-40/
CL150300

2.24

0.75

0.94

4.25

10.63

11.81

5.79

7.17

8.07

8.58

1.00

6.00

1.25

0.55

35

58

PN10-16/
CL150

2.40

0.87

1.18

4.21

12.87

13.46

8.86

8.86

10.16

10.67

1.25

9.25

1.81

0.71

67

89

PN25-40/
CL300

2.87

0.87

1.18

4.21

14.09

14.33

8.86

8.86

10.16

11.22

1.25

9.25

1.81

0.71

75

102

PN10-16/
CL150

2.72

0.87

1.18

4.29

15.35

15.55

8.58

9.84

10.63

12.76

1.25

9.25

1.81

0.71

86

111

PN25-40/
CL300

3.27

0.87

1.18

4.29

15.75

17.72

10.43

10.43

10.63

13.58

1.25

9.25

1.81

0.71

114

175

PN10-16/
CL150

3.07

1.06

1.38

4.49

15.00

18.39

12.17

12.17

11.97

15.00

1.50

9.25

1.81

0.71

151

217

PN25-40/
CL300

3.62

1.06

1.38

4.49

16.14

20.16

12.17

12.17

11.97

16.14

1.50

9.25

1.81

0.71

169

231

(3)

1. This nominal valve shaft diameter is the shaft diameter through the packing box. Use this diameter when selecting Fisher actuators.
2. Valve assembly only.
3. 48 mm for CL150 and CL300 single flange only.
4. Wafer
5. Single Flange

12

(5)

Product Bulletin

A81 Valve

21.1:A81
July 2012

D103301X012

Table 9. Line Bolting Dimensions
Y
Pressure Rating

VALVE SIZE
CL150

CL300

DN80 / NPS 3

4X 5/8-11

8X 3/4-10

PN10

PN16

PN25

PN40

DN100 / NPS 4

8X 5/8-11

8X 3/4-10

8X M16X2

8X M20X2.5

DN150 / NPS 6

8X 3/4-10

12X 3/4-10

8X M20X2.5

8X M24X3(1)

8X M20X2.5

DN200 / NPS 8

8X 3/4-10

12X 7/8-9

8X M20X2.5

12X M20X2.5

12X M24X3

12X M27X3(1)

DN250 / NPS 10

12X 7/8-9

16X 1-8

12X M20X2.5

12X M24X3

12X M27X3

12X M30X3.5(1)

DN300 / NPS 12

12X 7/8-9

16X 1-1/8-8

12X M20X2.5

12X M24X3

16X M27X3

16X M30X3.5

1. Not available in single flange with threaded holes.

Figure 8. Dimensions for Fisher A81, Single Flange Valve

A

A

Y
D

C

F

T

T

S

W

W
R

GE42533_3

K

G

U

E

Figure 9. Dimensions for Fisher A81, Wafer Style Valve

A

A

R
D

C

F

T

T

S

W

W

GE42533_3

G

K

E

U

13

Product Bulletin

A81 Valve

21.1:A81
July 2012

D103301X012

Table 10. Dimensions and Weights, Optional Mounting Bracket
VALVE SIZE /
PRESSURE RATING
DN50/
NPS 2

PN10-40/
CL150-300

DN80/
NPS 3

PN10-40/
CL150-300

DN100/
NPS 4

DN150/
NPS 6

DN200/
NPS 8

DN250/
NPS 10

DN300/
NPS 12

PN10-40/
CL150-300

PN10-40/
CL150-300

PN10-16/
CL150
PN25-40/
CL300
PN10-16/
CL150
PN25-40/
CL300
PN10-16/
CL150
PN25-40/
CL300

S(1)

C

E

L

M

T

mm

inch

mm

inch

mm

inch

mm

inch

mm

inch

12.7

0.50

9

0.35

74

2.91

64

2.52

10

0.39

15.9

19.1

25.4

31.8
31.8
31.8
31.8
38.1
38.1

0.63

0.75

1.00

1.25
1.25
1.25
1.25
1.50
1.50

11

14

19

22
22
22
22
27
27

0.43

0.55

0.75

0.87
0.87
0.87
0.87
1.06
1.06

76

103

108

107
107
109
109
114
114

2.99

4.06

4.25

4.21
4.21
4.29
4.29
4.49
4.49

64

87

87

85
85
85
85
85
85

2.52

3.43

3.43

3.35
3.35
3.35
3.35
3.35
3.35

12

0.47

16

0.63

21

0.82

22

0.87

22

0.87

24

0.94

24

0.94

29

1.14

29

1.14

U

W

mm

inch

mm

inch

mm

inch

ISO
5211

49.50

1.95

49.50

1.95

10

0.39

F07

72.12

2.84

72.12

2.84

12

0.47

F10

49.50

1.95

49.50

1.95

10

0.39

F07

72.12

2.84

72.12

2.84

12

0.47

F10

49.50

1.95

49.50

1.95

10

0.39

F07

72.12

2.84

72.12

2.84

12

0.47

F10

88.39

3.48

88..39

3.48

14

0.55

F12

49.50

1.95

49.50

1.95

10

0.39

F07

72.12

2.84

72.12

2.84

12

0.47

F10

88.39

3.48

88.39

3.48

14

0.55

F12

99.00

3.90

99.00

3.90

18

0.71

F14

116.67

4.59

116.67

4.59

22

0.87

F16

72.12

2.84

72.12

2.84

12

0.47

F10

88.39

3.48

88.39

3.48

14

0.55

F12

99.00

3.90

99.00

3.90

18

0.71

F14

116.67

4.59

116.67

4.59

22

0.87

F16

72.12

2.84

72.12

2.84

12

0.47

F10

88.39

3.48

88.39

3.48

14

0.55

F12

99.00

3.90

99.00

3.90

18

0.71

F14

116.67

4.59

116.67

4.59

22

0.87

F16

72.12

2.84

72.12

2.84

12

0.47

F10

88.39

3.48

88.39

3.48

14

0.55

F12

99.00

3.90

99.00

3.90

18

0.71

F14

116.67

4.59

116.67

4.59

22

0.87

F16

1. This nominal valve shaft diameter is the shaft diameter through the packing box. Use this diameter when selecting Fisher actuators.

Figure 10. Dimensions for Fisher A81, Wafer Style Valve with Optional Mounting Bracket

C

T

S
W

L

M
E

GE42533_3

14

U

Product Bulletin

A81 Valve

21.1:A81
July 2012

D103301X012

Table 11. Fisher A81 Valve Breakout Torque Requirements
TRIM CONFIGURATION: SOFT SEAL WITH PEEK/PTFE BEARINGS
VALVE
SIZE

TORQUE, NSm

SHAFT DIA

Shutoff nPmax

DN

mm

3 bar

7 bar

10 bar

15 bar

20 bar

25 bar

35 bar

45 bar

50 bar

50

12.7

12.8

14.7

16.2

18.7

21.1

23.6

28.5

33.4

35.9

80

15.9

19.7

23.4

26.1

30.7

35.3

39.9

49.1

58.2

62.8

100

19.1

31.1

37.6

42.4

50.5

58.7

66.8

83.0

99.2

107

150

25.4

60.8

75.9

87.2

106

125

144

181

219

238

200

31.8

103

135

158

198

237

276

355

434

473

250

31.8

159

212

252

318

385

451

584

---

---

300

38.1

228

310

371

473

576

678

883

---

---

VALVE
SIZE

TORQUE, LbfSin

SHAFT DIA

Shutoff nPmax

NPS

Inch

50
psid

100
psid

150
psid

200
psid

300
psid

400
psid

500
psid

600
psid

750
psid

2

1/2

115

130

145

160

190

220

250

280

325

3

5/8

178

206

234

262

318

374

430

486

570

4

3/4

282

331

381

430

529

628

727

826

975

6

1

553

668

783

898

1130

1360

1590

1820

2160

8

1-1/4

945

1190

1430

1670

2150

2630

3110

3590

4310

10

1-1/4

1460

1870

2270

2680

3490

4300

5110

---

---

12

1-1/2

2100

2720

3350

3970

5220

6470

7720

8970

---

TRIM CONFIGURATION: METAL SEAL WITH METAL BEARINGS
VALVE
SIZE

TORQUE, NSm

SHAFT DIA

Shutoff nPmax

DN

mm

3 bar

7 bar

10 bar

15 bar

20 bar

25 bar

35 bar

45 bar

50 bar

50

12.7

37.3

42.4

46.2

52.5

---

---

---

---

---

80

15.9

67.7

78.9

87.3

101

115

---

---

---

---

100

19.1

112

134

151

178

208

233

---

---

---

150

25.4

241

292

331

395

458

---

---

---

---

200

31.8

310

422

506

646

786

927

---

---

---

250

31.8

598

761

884

---

---

---

---

---

---

300

38.1

926

1270

---

---

---

---

---

---

---

300
psid

400
psid

500
psid

600
psid

750
psid

VALVE
SIZE

TORQUE, LbfSin

SHAFT DIA

Shutoff nPmax

NPS

Inch

50
psid

100
psid

150
psid

200
psid

2

1/2

336

374

413

451

---

---

---

---

---

3

5/8

611

696

782

867

1040

---

---

---

---

4

3/4

1020

1180

1350

1520

1850

---

---

---

---

6

1

2190

2580

2970

3360

4140

---

---

---

---

8

1-1/4

2860

3710

4570

5420

7130

---

---

---

---

10

1-1/4

5450

6700

7950

---

---

---

---

---

---

12

1-1/2

8540

11200

---

---

---

---

---

---

---

15

Product Bulletin

A81 Valve

21.1:A81
July 2012

FieldQ Actuator Features




Simple, modular construction– Makes operation
and maintenance easier. The basic actuator module
includes the pistons, rack and pinion gear, springs
(for spring-return actuators), housing, and position
indicator. Pneumatic operation is accomplished
with an ASCO 8551 solenoid valve. The solenoid is
activated by a 120 VAC 60 Hz or 110 VAC 50 Hz
signal. It is pad mounted and does not require a
bracket. The basic actuator features built-in visual
position indication, travel stops for both directions,
and a balanced pinion design.

Three Point Suspension System–Three carbon-filled
PTFE guide bands provide a low friction bearing
surface for piston alignment and rack support.
Elimination of metal-to-metal contact between
pistons and cylinder wall reduces friction for
outstanding cycle life, smooth piston travel, and
maximum power.

D103301X012



Balanced Piston Design–As part of the design, three
equally spaced bearing surfaces are cast into each
piston. The rack and pinion construction results in
even distribution of bearing loads, optimum gear
engagement, and reduced piston tilt. Equal spring
force applied to each piston enhances actuator life.



Multiple Constructions–Conversion from double
acting to spring return, or vice versa, is simple and
safe, thus reducing spare part requirements.
Valve/actuator action is also field reversible.



Dual Stop Adjustment– This adjustment is standard
on all E Series actuators. The P Series actuators are
supplied with a limit plate adjustment feature.



Dual Piston Design–Air pressure applies a balanced
force across the common pinion gear.
Symmetrically balanced center mount construction
eliminates undue stress on the valve stem,
bearings, and disk.

For further information, refer to:
http://www.emersonprocess.com/valveautomation/
fieldq/index.html

Neither Emerson, Emerson Process Management, nor any of their affiliated entities assumes responsibility for the selection, use or maintenance
of any product. Responsibility for proper selection, use, and maintenance of any product remains solely with the purchaser and end user.
Fisher, POSI-SEAL, FieldQ, and ENVIRO-SEAL are marks owned by one of the companies in the Emerson Process Management business unit of Emerson
Electric Co. Emerson Process Management, Emerson, and the Emerson logo are trademarks and service marks of Emerson Electric Co. All other marks are
the property of their respective owners.
The contents of this publication are presented for informational purposes only, and while every effort has been made to ensure their accuracy, they are not
to be construed as warranties or guarantees, express or implied, regarding the products or services described herein or their use or applicability. All sales are
governed by our terms and conditions, which are available upon request. We reserve the right to modify or improve the designs or specifications of such
products at any time without notice.
Emerson Process Management
Marshalltown, Iowa 50158 USA
Sorocaba, 18087 Brazil
Chatham, Kent ME4 4QZ UK
Dubai, United Arab Emirates
Singapore 128461 Singapore

www.Fisher.com
E
162008, 2012 Fisher Controls International LLC. All rights reserved.



---

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