Management of Change Guide: Replacement of Fisher POSI-SEAL A31A Valve with Fisher 8532 High-Performance Butterfly Valve
Table of contents
Loading...Fisher Management of Change Guide: Replacement of Fisher POSI-SEAL A31A Valve with Fisher 8532 High-Performance Butterfly Valve Manuals & Guides
Management of Change Guide
Replacement of Fisher™ POSI-SEAL™ A31A
Valve with Fisher 8532 High-Performance
Buttery Valve
Table of Contents
Management of Change ..................................2
Background ....................................................2
Question & Answer Checklist ..........................2
September 2018
D352491X012
POSI-SEAL A31A and 8532 Valve Comparison ..4
Scope, Size, Class ................................................................ 4
Capacities (Cv) .................................................................... 4
Actuator Sizing (Torque) ..................................................... 4
Dimensions ........................................................................ 4
Body Style .......................................................................... 5
Spare Parts ......................................................................... 5
Conclusion ......................................................5
Additional Resources ......................................5
Management of Change
Management of Change (MOC) is a procedure used to proactively manage changes
that have the potential to impact safety or the process within a plant. Evaluating
new techniques for improving MOC approval procedures can have an impact on
plant efciency. Historically, upgrading obsolete products or replacing existing
process control equipment had been delayed or abandoned due to the extensive
paperwork involved in completing a complex MOC approval sheet.
Background
The Fisher POSI-SEAL A31A rotary valve is a high-performance buttery valve
(HPBV) for use in automated on/off, quarter-turn applications. The A31A valve is
congured with a keyed drive shaft for use with various styles of valve actuators.
Fisher POSI-SEAL A31A valves will be made obsolete, effective October 2016, and
will transition to the Fisher 8532 rotary valve.
The A31A valve is very similar to the 8532 valve, as they were developed at the
same time. The 8532 valve is typically congured with a spline shaft and paired with
Fisher 2052 or 1061 actuators for excellent throttling performance. However, the
8532 valve is now available with shaft style and actuator mounting options; this
makes it possible to congure an 8532 valve just like an A31A valve. The 8532 valve
congured with keyed shafts will perform and install the same as the A31A valve,
and it may be used in the same applications.
MOC: POSI-SEAL A31A to 8532 Valve
September 2018
D352491X012
For more information regarding Fisher valves, contact your local Emerson sales ofce.
Question & Answer Checklist
Q: Does the proposed modication cause any changes to the piping and
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instrumentation diagram (P&ID)?
A: No.
Q: Does the proposed modication change process chemistry,
technology, or operating and control philosophies?
A: No.
Q: Does the proposed modication change how the existing plant is
operated?
A: No.
Q: Does the proposed modication change process ows?
A: No.
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