Emerson Fisher DFA Instrukcja obsługi - Strona 8

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DFA Desuperheater

August 2013

Table 7. AF Nozzle Specifications

Figure 5. Spray Nozzle Tack Weld Locations

GA26453-B

ORIENTATION OF FLATS NOT CRITICAL

To further check the spring, the spring can be removed by first removing the pin, using a small drill bit as a punch and

unscrewing the spring casing from the plug stem. The nozzle can be reassembled by following a reverse order of

disassembly, taking care to line the hole in the plug stem up with the hole in the spring casing, then pressing the pin

back into place through the two parts.

9. The travel can be determined by using a feeler gauge to measure the distance between the nozzle body near the

water injection ports to the side of the spring casing as outlined in figure 4. This measurement must match the

factory set plug travel for the corresponding nozzle type as shown in table 7.

10. Inspect nozzle threads for damage and clean if needed; if damage is present, nozzle replacement will be

necessary.

11. Rinse both the desuperheater body and nozzle to remove particulate.

12. Screw nozzle into the desuperheater body and tighten just until the spray head is flat and tight against the

desuperheater body.

13. Tackweld a small piece of welding wire onto the nozzle mount next to either of the spray head flats to prevent

rotation during service (refer to figure 5). Maintain low heat to prevent distortion of the nozzle.

14. Reinstall the desuperheater into the line, using a reverse order of assembly; refer to the installation instructions to

complete this step. Make sure the mounting flange gasket (customer supplied) is replaced with a new one.

NOZZLE TYPE

AF7

AF10

AF14

AF17

AF20

AF24

AF28

AF32

AF35

AF40

AF44

AF STYLE NOZZLE

WIRE, TACK

WELD ON BOTH ENDS

Instruction Manual

PLUG TRAVEL, INCHES

0.014

0.028

0.029

0.034

0.036

0.042

0.048

0.056

0.065

0.063

0.069

D103643X012