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3 self-contained control valve actuator removal – AERCO CXT-E Retrofit Kit User Manual

Page 18

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ECS and CXT-E Retrofit Instructions Kit # 27004-TAB

Technical Instruction Document

TID-0141_0A

12/30/2014

AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, New York 10913 • Phone: 800-526-0288 Page 18 of 76

2.5.3 Self-Contained Control Valve Actuator Removal

Refer to Figure 2-6 and remove the Self-Contained Valve Actuator as follows:

1. Loosen the locknut on the thermal element adjustment sleeve. Unscrew the adjustment

sleeve to remove the sleeve and thermal element from the Actuator.

2. Carefully loosen the compression fittings on the upstream and downstream tubing to relieve

any trapped pressure buildup. Completely remove both the upstream and downstream
tubing assemblies and compression fittings. The tapped NPT ports in the Valve Body will be
plugged during the replacement procedures in Section 3.

3. Remove the hex head cap screws securing the Actuator to the Valve Body. Valve sizes

from 1” to 2” have 6 cap screws, while sizes 2 ½” to 4” Valves have 8 cap screws.

CAUTION

Use care when performing step 4 to avoid damaging or scratching internal
Valve Body parts. It is imperative that the Actuator be lifted straight up to
avoid sticking or binding.

4. Lift the Actuator Housing straight up and off the Valve Body. Doing so will also remove the

entire inner valve assembly (Figure 2-7), including the Valve Stem, Seat, Valve Plug Shaft
and Top/Bottom Pistons. Depending on the age and condition of the valve, considerable
force may be required to pull the Pistons through the Valve Body. If it cannot be removed,
the Valve Stem may be used as an impact hammer to remove scale build-up on the internal
valve surfaces and allow Piston removal.

Replacement parts for these removed items are provided in the applicable Retrofit Kit for
the Valve size being retrofitted. These items will be replaced in Section 3. The Retrofit Kit
also contains a new Lower Shaft, Valve Top/Gasket, plus additional replacement items for
the Valve being retrofitted.

5. Proceed as follows, depending on the size of the Valve being retrofitted:

(a) For 2 ½ to 4 inch Valves, separate the Valve Seat Retaining Disc from the Valve Seat

by removing the four (4) cap screws (Figure 2-7).

(b) For 1 to 2 inch Valves, hold the Valve Plug Shaft with a pair of pliers and remove the

Valve Stem Retaining Nut from the Shaft (Figure 2-8).

6. Insert a 1/8 inch steel rod through the hole near the top of the Valve Stem (Figure 2-7 or 2-

8).

NOTE

If “flats” are provided on the Actuator Connecting Shaft and Valve Stem,
open-end wrenches may be used in step 7 to disconnect the Valve Stem
and Actuator Shaft.

7. Grasp the Actuator Connecting Shaft (Figure 2-7 or 2-8) with a pair of pliers. Carefully turn

the Valve Stem counterclockwise and separate it from the Actuator Connecting Shaft.

8. Replacement of all required Valve parts will be accomplished using the appropriate

instructions and illustrations in Section 3.

This manual is related to the following products: