AERCO ECS Retrofit - Manual (Page 34)

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The installation procedures for the Linkage Assembly and Actuator Assembly are provided in
paragraphs 4.1.1 and 4.1.2 which follow.
4.1.1 Linkage Assembly Installation
Remove the Linkage Assembly from the Retrofit Kit and install as follows:
1. Check to ensure that the correct Linkage Assembly and Adapter are provided for the valve
size being retrofitted (Figure 4-1). Also, ensure that the Linkage pin is inserted in the correct
location for this valve size.
CAUTION
It is imperative that the Gasket provided with the Linkage Assembly be
installed between the Valve Top and Linkage Assembly. Failure to do so
will void the equipment warranty.
2. Refer to Figure 4-2 and position the Gasket and Linkage Assembly on the Valve Top as
shown.
3. Secure the Linkage Assembly to the Valve Top using the two 3/8-16 Hex Head Bolts provided.
4. Install two 1/4-20 Hex Nuts (1 to 3 inch Valves), or two 3/8-16 Hex Nuts (4 inch Valve) on the
Valve Shaft (Figure 4-2).
5. Rotate the two Hex Nuts clockwise towards the lower end of the Valve Shaft.
6. Install the Indicator Plate on the Valve Shaft with the curved end facing upward as shown in
Figure 4-3.
7. Attach the Valve Shaft to the Linkage Adapter by rotating the Shaft counterclockwise (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 engages the Linkage Adapter threads.
8. Press down on the Valve Shaft to compress the Pilot Spring in the Valve Body.
9. Raise the Indicator Plate so it is contacting the bottom of the Adapter and observe the position
on the Linkage Scale. Rotate the Valve Shaft as necessary until the raised Indicator Plate is
aligned with the “0” (zero) marking on the Linkage Scale.
10. When properly aligned, raise the Hex Nuts on the Valve Shaft by rotating them
counterclockwise. Position the Hex Nuts so they are snug against the Indicator Plate.
11. Proceed to paragraph 4.1.2 to install the Actuator Assembly.