AERCO ECS Retrofit - Manual (Page 29)

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5. Replace Packing Assembly (20) and reassemble Packing Nut (18) in Valve Top (21).
6. The last step of the Valve Reassembly procedure is to replace two Hex Nuts on the Valve
Shaft. Valve sizes from 1 to 3 inches contain two 1/4-20 Hex Nuts in the Retrofit Kit. However,
4 inch Valves contain two 3/8-16 Hex Nuts in the Kit. Replace the appropriate Hex nuts on the
Valve Shaft.
3.2 Valves Previously Equipped With Self-Contained Actuators
The internal parts and assemblies contained in Valves which were previously equipped with Self-
Contained Actuators must basically be rebuilt with the items provided in the Retrofit Kit. The Retrofit
Kit for Valve sizes from 1.00” to 2.00” include an Inner Pilot Assembly Kit (29021-[ ]) and a Valve
Piston Assembly Kit (12168-[ ]). The items in these kits are shown in Figures 3-3 and 3-4. Kits for
Valve sizes from 2.50” to 4.00” include a Main Valve Assembly Kit (27006-[ ]) containing the items
shown in the exploded view in Figure 3-5.
In addition to replacement the parts contained in these Kits, new items must be added to ALL Valve
Bodies which previously used Self-Contained Actuators. These items include:
• Lower Shaft
• Valve Top
• Valve Top Gasket
• Hex Bolts (1” to 2” Valves) or Cap Screws (2.5” to 4.0” Valves) to secure Valve Top
• Packing Assembly
• Packing Nut
• 1/4” NPT Plugs which get inserted into tapped holes in Valve Body
Refer to Figure 3-1 (1” to 2” Valves) or Figure 3-2 (2.5” to 4” Valves) for the locations of these items.