AERCO ECS Retrofit - Manual (Page 28)

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3.1.2 Valve Reassembly Procedure
Reassembly is accomplished by basically reversing the previous Disassembly steps. Refer to Figure
3-1 or 3-2 for the applicable Valve size. Perform the following steps in the order specified and
REPLACE the items shown in BOLD type with the new parts provided in the Retrofit Kit.
1. For 1 inch to 2 inch Valve sizes, refer to Figure 3-1 and reassemble or replace the following
items in the order specified:
(a) Valve Plug Shaft (5)
(b) Seat Retainer (34)
(c) Replace Disc Seat (7)
(d) Retaining Disc (8)
(e) Lower Shaft (16) and Valve Stem (12)
(f) Valve Stem Retaining Nut (35)
(g) Pilot Spring (10)
(h) Retaining Ring (3)
(i) Lock Washer (23)
(j) Proceed to step 3 and continue the Valve Reassembly process. Steps 3 through 6 apply
to ALL valve sizes.
2. For 2 ½, 3 and 4 inch Valve sizes, refer to Figure 3-2 and reassemble or replace the following
items in the order specified:
(a) Top Piston (6) and Bottom Piston (3) Assemblies
(b) Replace Valve Seat (7)
(c) Lower Shaft (16) and Valve Stem (12)
(d) Valve Seat Retaining Disc (8)
(e) Socket Head Cap Screws (9)
(f) Pilot Spring (10)
(g) Pilot Spring Backup Washer (31), - 4 inch Valve Only
(h) Pilot Spring Retainer (11)
(i) Lock Washer (23)
(j) Proceed to step 3 and continue the Valve Reassembly process. Steps 3 through 6 apply
to ALL valve sizes.
3. Replace Valve Top Gasket (13) and reassemble Valve Top (21) on Valve Body (1).
4. Secure Valve Top (21) to Valve Body (1) with the Bolts or Cap Screws (14).