Instruction manual

Instruction Manual

D500248X012

A31D Valve

April 2014

1. Replace the gasket (key 21) and gasket retainer (key 20) over the end of the follower shaft. Use a new gasket.

2. Replace the four hex head bolts (key 23) and lockwashers (key 22) to hold the gasket retainer in place.

3. Be sure to center the gasket over the follower shaft bore before retightening the bolts. Tighten down the 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 Fisher parts.

Typical parts are shown in figure 9, 10, or 11.

When corresponding with your Emerson Process Management sales office about an A31D valve, please identify the

valve as an A31D 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 may void your warranty, might adversely affect the

performance of the valve, and could cause personal injury and property damage.

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.