AERCO ECS Retrofit - Manual (Page 22)

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3. RECOMMENDED REPLACEMENT OF VALVE ASSEMBLY PARTS
As mentioned in paragraph 2.5, AERCO recommends that the Valve Seat and Packing be replaced
on the Valve Body, prior to installing the ECS Retrofit Kit items described in Section 4. Valve Bodies
which previously utilized Self-Contained Actuators must be modified to include new additional items
such as: a Valve Top, Valve Stem and a Packing Nut.
Refer to the applicable paragraphs which follow for the Valve size and Actuator type used on your
system.
NOTE
The procedures in paragraphs 3.1 and 3.2 which follow, assume that the
previously installed Pneumatic, Electro-Hydraulic or Self-Contained Actuator
has already been removed.
3.1 Valves Previously Equipped With Pneumatic or Electro-Hydraulic Actuators
The parts replacement items required for Valve Bodies which previously used Pneumatic or Electro-
Hydraulic Actuators are basically identical. Only minor variations exist for the various Valve Body
sizes. The Valve Body components for 1.00” to 2.00” and 2.50” to 4.00” are shown in Figures 3-1 and
3-2, respectively.
3.1.1 Valve Disassembly Procedure
Proceed as follows:
NOTE
Steps 1 through 5 which follow apply to all valve sizes shown in Figure 3-1
and 3-2.
1. Remove the Hex Nut (17) from the Valve Body Shaft.
2. Remove the Packing Nut (18) and Packing Assembly (20).
3. Remove the Bolts or Cap Screws (14) securing the Valve Top (21).
4. Remove the Valve Top (21) and Valve Top Gasket (13).
5. Carefully lift out the entire Shaft /Seat/Piston Assembly.
6. For 1 inch to 2 inch Valve sizes, refer to Figure 3-1 and remove the following items in the order
specified:
(a) Lock Washer (23)
(b) Retaining Ring (11)
(c) Pilot Spring (10)