Data Sheet

A81 Valve
D103301X012
Product Bulletin
21.1:A81
July 2012
2
 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....................
FieldQ Actuator Features 16......................