AERCO Electronic Control Valve - Manual (Page 26)

8-2
CM8. Next, completely remove the Hex Nuts (17) from the Valve Shaft (16).
CM9. Remove the Packing Nut (18) and the Packing Assembly (20) from the Valve Body.
CAUTION
Over-tightening the Packing Nut (18) may trap the Valve Stem and slow or stop Valve
motion.
CM10. Replace BOTH the Packing Nut (18) and the Packing Assembly (20) with a NEW Packing Nut
and Packing Assembly.
CM11. Replace the Hex Nuts (17) onto the Valve Body Shaft (25) and position them in the same location
noted in step CM7.
CM12. Attach the Actuator (27), Linkage (26) and Gasket (29) to the Valve Top using the two Cap
Screws (19) provided.
CM13. Install the Indicator Plate on the Valve Lower Shaft (16) and secure it in place with the Linkage
Adapter.
CM14. Reconnect the Linkage Adapter to the Linkage Shaft by replacing the Shaft Pin.
VALVE DISASSEMBLY
Refer to Figure 8-1, or Figure 8-2 and proceed as follows:
CM15. Close the upstream and downstream shutoff valves before and after the Control Valve. If it is
necessary to keep the Heater in operation, proceed in accordance with step OP3 in the
OPERATING Section of this manual before continuing. If not, proceed directly to the next step.
CM16. If the Control Valve is easily accessible for disassembly and reassembly, leave it installed in the
fluid line. If it is not easily accessible, remove the Valve from the line and clamp it in a bench vise
for easy accessibility.
CM17. Completely remove the Actuator (27) and Linkage Assembly (26) from the Valve Body as
described in steps CM1 through CM5.
CM18. Refer to Figure 8-1 or Figure 8-2. It is strongly recommended that disassembly of the Valve be
limited to only the steps necessary to restore the Valve to proper operation. However, the
following steps cover complete disassembly, if necessary. When performing Valve disassembly,
USE EXTREME CARE not to mar or scratch any surfaces. The following steps assume that the
Actuator and Linkage Assemblies have already been removed from the Valve Body.
CM19. Remove the following parts in the order specified:
CAUTION
CAREFULLY remove the Packing Nut (18) and Cap Screws (14) indicated below
to relieve any trapped pressure.
• Hex Nuts (17)
• Packing Nut (18)
• Packing Assembly (20)
• Cap
Screws (14)
• Valve Top (21)
• Valve Top Gasket (13)