Instruction manual

A31A Valve
Instruction Manual
Form 5291
March 2008
18
excessive force, use appropriate care
when driving the pins into the disc hub
and shaft(s). Use the right tool. Do not
use excessive force.
12. Install the appropriate tangential pins, and disc
pins. Use 2 tangential pins that will go through the
upper shaft and 1 disc pin that will go through the
lower shaft.
13. Refer to Packing Maintenance and the
Anti-Blowout Design procedures in this manual to
re-install the packing and anti-blowout design.
Gasket Retainer
Valves with a two-piece shaft use a gasket retainer
and gasket (keys 20 and 21) to cover the lower shaft
opening in the valve body. The gasket is held in
place by the gasket retainer and four hex head bolts
and lockwashers (keys 23 and 22). When
reassembling the valve, use a new gasket.
Be sure to center the gasket over the lower shaft
bore before retightening bolts. Tighten down bolts
evenly in a crossover or star pattern.
Refer to table 6 for proper torque values.
Parts Ordering
When replacement parts are required, always use
genuine Fisherr parts.
Typical parts are shown in figure 9.
When corresponding with your Emerson Process
Management sales office about a Type A31A valve,
please identify the valve as a Type A31A and
provide the valve serial number. For valve/actuator
combinations assembled at the factory, the valve
serial number is stamped on the nameplate attached
to the actuator.
WARNING
Use only genuine Fisher replacement
parts. Components that are not
supplied by Emerson Process
Management should not, under any
circumstances, be used in any Fisher
valve, because they will void your
warranty, might adversely affect the
performance of the valve, and could
cause personal injury and property
damage.
Note
Neither Emerson, Emerson Process
Management, nor any of their affiliated
entities assumes responsibility for the
selection, use and maintenance of any
product. Responsibility for the
selection, use, and maintenance of any
product remains with the purchaser
and end-user.
Retrofit Kits
Retrofit kits include all parts required for installation
of the ENVIRO-SEAL packing system into existing
high-performance butterfly valves. Retrofit kits are
available for single PTFE packing. See table 7 for
retrofit kit included parts.
Note: Key 103, the spring pack assembly, is made
up of the packing spring stack held in place by an
O-ring on the packing follower.
See table 8 for retrofit kit part numbers.
Table 7. Retrofit Kit Included Parts
Key Description Quantity
10 Anti-blowout follower 1
17 Jam nut 1
100 Packing stud 2
101 Packing nut 2
102 Packing flange 1
103 Spring pack assembly 1
105 Packing Set 1
106 Anti-extrusion washer 2
(1)
107 Packing box ring 2
(2)
111 Tag 1
112 Cable 1
1. Not included in graphite packing kit.
2. Only 1 req’d for NPS 18 CL300, NPS 20 CL150 and NPS 24 CL150.