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ECS & CXT-E Control Valve Retrofit for SW Double Wall Heaters
Technical Instruction Document
TID-0140_0A
12/30/2014
AERCO International, Inc.
•
100 Oritani Dr.
•
Blauvelt, New York 10913
•
Phone: 800-526-0288
Page 19 of 58
3. RECOMMENDED REPLACEMENT OF VALVE ASSEMBLY
PARTS
As mentioned in paragraph 2.5, AERCO recommends that the Valve Seat and Packing be
replaced on the Valve Body, prior to installing the ECS Retrofit Kit items described in Section 4.
Valve Bodies which previously utilized Self-Contained Actuators must be modified to include new
additional items such as: a Valve Top, Valve Stem and a Packing Nut.
Refer to the applicable paragraphs which follow for the Valve size and Actuator type used on your
system.
NOTE
The procedures in paragraphs 3.1 and 3.2 which follow, assume that the
previously installed Pneumatic, Electro-Hydraulic or Self-Contained
Actuator has already been removed.
3.1
VALVES PREVIOUSLY EQUIPPED WITH PNEUMATIC OR ELECTRO-HYDRAULIC
ACTUATORS
The parts replacement items required for Valve Bodies which previously used Pneumatic or
Electro-Hydraulic Actuators are basically identical. Only minor variations exist for the various
Valve Body sizes. The Valve Body components for 1.00” to 2.00” and 2.50” to 4.00” are shown in
Figures 3-1 and 3-2, respectively.
3.1.1 Valve Disassembly Procedure
Proceed as follows:
NOTE
Steps 1 through 5 which follow apply to all valve sizes shown in Figure 3-1
and 3-2.
1. Remove the Hex Nut (17) from the Valve Body Shaft.
2. Remove the Packing Nut (18) and Packing Assembly (20).
3. Remove the Bolts or Cap Screws (14) securing the Valve Top (21).
4. Remove the Valve Top (21) and Valve Top Gasket (13).
5. Carefully lift out the entire Shaft /Seat/Piston Assembly.
6. For 1 inch to 2 inch Valve sizes, refer to Figure 3-1 and remove the following items in the
order specified:
a. Lock Washer (23)
b. Retaining Ring (11)
c. Pilot Spring (10)
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)