AERCO Electronic Controls System (ECS) - Manual (Page 47)

Electronic Control System (ECS) and Type CXT-E Valve
8. CORRECTIVE MAINTENANCE
VD2: 02/28/14 AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, New York 10913 • Phone: 800-526-0288 Page 47 of 82
AC-105 OMM-0003_0D
8. CORRECTIVE MAINTENANCE
8.1 INTRODUCTION
The Corrective Maintenance procedures are divided into two Parts. Part 1 provides corrective
maintenance for all sizes of Electronic Control Valves Type CXT-E. Part 2 provides corrective
maintenance for the Electronic Control System (ECS).
8.2 PART 1 - CXT-E CONTROL VALVE CORRECTIVE MAINTENANCE
The corrective maintenance procedures for the Electronic Control Valve are divided into the
following major areas:
• Valve Shaft Seal Retainer Replacement
• Valve Disassembly
• Valve Reassembly
• Actuator Replacement
• Linkage Replacement
Refer to the applicable paragraphs which follow and perform the Corrective Maintenance steps
indicated.
8.2.1 Valve Shaft Seal Retainer Replacement:
Refer to Figure 8-1 or Figure 8-2 and proceed as follows:
WARNING
Ensure that the Control Valve has been isolated from the steam
or hot (boiler) water supply. Live steam or hot water can cause
serious burns to personnel.
WARNING!
Ensure that all electrical power to the Control System and
Actuator have been disconnected. Serious personal injury may
result if this Warning is not observed.
1) Loosen the Hex Nuts (17) under the Indicator Plate (Figure 8-1 or 8-2) approximately a
half turn clockwise.
2) Disconnect the Linkage Adapter from the Valve Shaft (16) by turning the Shaft clockwise
(as viewed from above). If the Valve Shaft cannot be turned by hand, use an open-end
wrench to turn the “double-nuts” on the Shaft until it disengages the Linkage Adapter
threads.
3) Remove the Indicator Plate from the Valve Shaft (16).
4) Remove the two Cap Screws (19) securing the Linkage Assembly (26) to the Valve Top
(21).
5) Remove the complete Linkage Assembly (26), with the Actuator Assembly (27) still
attached, from the Valve Top. Also, remove the Gasket (29).
6) If the Packing Nut (18) is faulty (leaking or binding the Valve Shaft), it must be replaced.
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