Emerson Fisher POSI-SEAL A81 Data Sheet
A81 Valve
D103301X012
Fisherr POSI-SEAL™ A81 Rotary Valve
The Fisher POSI-SEALA81rotaryvalvewithFieldQt
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.
Product Bulletin
21.1:A81
July 2012
The actuator sizing and selection process is improved
by simply reading a table for information.
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.
W9479
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.
www.Fisher.com
Product Bulletin
21.1:A81
July 2012
A81 Valve
D103301X012
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.
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
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 NPS2,3,4,6,8,10,and12
Pressure Rating PN 10to 40 per EN 12516-1 CL150 / 300 per ASME B16.34
EN 1.0619 steel WCC steel
EN 1.4409 stainlesssteel CF3M (316L) stainless steel
Valve Body Materials
EN 1.4409 stainlesssteel CF3M stainless steel
Chrome-plated EN 1.4409 Stainless Steel Chrome-plated CF3M Stainless Steel
S31600 (316SST) seal ring - 0.1scfhperunitofNPS(NPS6valve=0.6scfh)perMSSSP-61
Seal
(4)
Seal
(3)
Disk Materials
Face-to-Face Dimensions Meets MSS SP68, API 609, and EN 558 standards
Flow Characteristic Approximately linear
Shaft Diameters and Approximate Weights See table 8
1. This material is not listed in EN 12516-1orASMEB16.34.Seefigure6forpressure/temperatureratings.
2. This material is not listed in EN 12516-1.Seefigure6forpressure/temperatureratings.
3. UHMWPE stands for ultrahigh molecular weight polyethylene.
4. RPTFE is a reinforcedPTFE seal.
5.LCCconstructionisstandardinwaferstyleonly.ConsultyourEmersonProcess Management sales office for single flange valve body style information.
PTFE or RPTFE
Metal or UHMWPE
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 or through holes
Shutoff
Flow Coefficients See Fisher Catalog 12
Flow Direction Standard (forward flow) is with the seal retainer facingupstream; reverse flow is permissible for soft seals only
Disk Rotation Counterclockwiseto open (when viewed from actuator side of valve body) through 90 degrees of disk rotation
LCC LCC
(1)
CW2M
(2)
M35-2
CW2M CW2M
M35-2 M35-2
PTFE, RPTFE, or UHMWPE seal ring - No visible leakage per MSS SP-61
CW2M
M35-2
(1)
(5)
21.1:A81
July 2012
Table 2. Materials (Other Valve Components)
Component Material
Shafts and Pins S17400 (17-4 PH) stainless steel,S20910 (XM-19) stainless steel, N10276, N05500
Anti-blowout Ring N07718
Seal PTFE, RPTFE, or UHMWPEwith S31600 (316 stainless steel) or R30003 spring. Metalseal 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 graphitepacking
Follower Spring N07718 with carbon-filled PEEK or S31600 spring seats
Bolting B8M Class2, B7M, N05500, N07718
Nuts 8M, 2HM,N04400, N10276
Table 3. Trim Combinations with Standard Construction Materials
Valve Body Material Shaft Material Disk Material Bearings Seal Material
1.4409 & CF3M PEEK/PTFE PTFE or RPTFE
1.0619 & WCC S17400 H1075
LCC S17400 H1075 1.4409 & CF3M PEEK/PTFE PTFE
1.4409 & CF3M S20910
CW2M N10276 CW2M PEEK/PTFE PTFE or RPTFE
M35-2 N05500 M35-2 PEEK/PTFE PTFE or RPTFE
1.4409 & CF3M Chrome-Plated
1.4409 & CF3M PEEK/PTFE PTFE or RPTFE
1.4409 & CF3M Chrome-Plated
PEEK/PTFE UHMWPE or Metal
Alloy 6or S31600 Nitride Metal
PEEK/PTFE UHMWPE or Metal
Alloy 6or S31600 Nitride Metal
3
Product Bulletin
21.1:A81
July 2012
Figure 1. Typical Fisher A81 Valve Construction Detail
RETAINERCLIP (LINE
CENTERING CLIP)
A81 Valve
D103301X012
ANTI-BLOWOUT
RING
FOLLOWER
SHAFT
EXPANSION PIN
AND TAPER PIN
RETAINER
CLIP
SEAL
RETAINER
SEAL RING
RETAINER
CLIP
SEAL
RETAINER
SEAL RING
DISK
DRIVE SHAFT
BEARING
VALVE BODY
DISK
GE36289-A
4
SOFT SEAL
METAL SEAL
A81 Valve
D103301X012
Figure 2. Comparison of Disk Action
SEAL RING (SOFT SEAL
CONSTRUCTION
SHOWN)
CONVENTIONAL
DISK PATH
OF ROTATION
ECCENTRIC
DISK PATH
OF ROTATION
ECCENTRIC
DISK CENTER
OF ROTATION
CENTERLINE OF
VALVE BODY
OPEN
CONVENTIONAL
DISK CENTER
OF ROTATION
CONVENTIONAL
DISK
Product Bulletin
21.1:A81
July 2012
ECCENTRIC
DISK
GE36289-A
DISK FULLY CLOSED DISK FULLY OPEN
Figure 3. Available Seal Configuration
SEAL
RETAINER
PRESSURE-ASSISTED
SEAL
HIGH
PRESSURE
SHUTOFF
DISK
FACE
B1558-3
METAL SEAL
VALVE BODY
SEAL
RETAINER
SPRING
PRESSUREASSISTED
SEAL
HIGH
PRESSURE
SHUTOFF
DISK FACE
VALVE BODY
VALVE
BODY
SEAL
RING
SOFT SEALS
5
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