AERCO ECS Retrofit - Manual (Page 23)

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(d) Valve Stem Retaining Nut (35)
(e) Lower Shaft (16) and Valve Stem (12)
(f) Retaining Disc (8)
(g) Disc Seat (7)
(h) Seat Retainer (34)
(i) Valve Plug Shaft (5)
7. For 2 ½, 3 and 4 inch Valve sizes, refer to Figure 3-2 and remove the following items in the
order specified:
(a) Lock Washer (23)
(b) Pilot Spring Retainer (11)
(c) Pilot Spring Backup Washer (31), - 4 inch Valve Only
(d) Pilot Spring (10)
(e) Socket Head Cap Screws (9)
(f) Valve Seat Retaining Disc (8)
(g) Lower Shaft (16) and Valve Stem (12)
(h) Valve Seat (7)
(i) Top Piston (6) and Bottom Piston (3) Assemblies
8. Clean all parts thoroughly and remove all dirt and/or scale.
9. Next, proceed to the Valve Reassembly procedures in paragraph 3.1.2 and replace the items
indicated with the new parts provided in the Retrofit Kit.