DeZurik 145 Instrukcja obsługi - Strona 8

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DeZURIK

DeZURIK MODELS 145 AND 250 DIAPHRAGM ACTUATOR ISO MOUNTING

Actuator Disassembly

Refer to Figure 1 for component identification.

1. Remove the actuator from the valve as described in the Removing the Actuator from Valve

section.

2. Apply just enough air pressure to the actuator to relieve the force on the stop bolts (B23) and

back out both stop bolts several turns. Relieve the air pressure.

3. Remove the diaphragm cover screws (B15), nuts (B16), washers (B42), diaphragm cover (B11)

and diaphragm (B14).

4. Remove the four pointer screws (B7) and the pointer (B6).

5. Remove the four cover screws (B36), the cover (B4) and the gasket (B22).

6. Carefully remove the diaphragm disc (B13) and stem (B35) from the housing assembly (B1).

Do not scratch or damage the stem. To remove the disc from the stem, wrench on the last 1"

(25mm) of the stem closest to the disc. The remainder of the stem is bearing surface and must

remain free of wrench marks.

7. If replacing the lower diaphragm cover (B12), remove the screws (B18), lockwashers (B19),

reinforcing plate (B20), lower diaphragm cover (B12), screws (B9), lockwashers (B10) and

diaphragm base (B17).

8. If relocating or replacing the spring cartridge (B8), remove the screws (B9), lockwashers (B10)

and the spring cartridge from the housing assembly (B1). Do not disassemble the spring

assembly.

The spring cartridge includes a compressed spring. Death or serious injury can result if

the spring cartridge is disassembled.

DO NOT DISASSEMBLE THE SPRING CARTRIDGE

Before assembling the actuator, clean and inspect all parts. Worn parts-especially seal and bearings-

should be replaced. Refer to Figure 1 for component identification and orientation. Note that the

diaphragm, spring cartridge and gear sector positions depend upon whether the actuator action is

spring-to-close or spring-to-open.

1. If the spring cartridge (B8) was removed, mount the spring cartridge to the housing assembly

with screws (B9) and lockwashers (B10). Tighten the screws to 180 ± 20 foot pounds (244 ± 27

Nm).

2. If the lower diaphragm cover (B12) and diaphragm base (B17) were removed, mount the

diaphragm base to the housing assembly (B1) with screws (B9) and lockwashers (B10).

Tighten the screws to 180 ± 20 foot pounds (244 ± 27 Nm). Then mount the lower diaphragm

cover (B12) and reinforcing plate (B20) to the diaphragm base (B17) with screws (B18) and

lockwashers (B19). Tighten the screws to 26 ± 3 foot pounds (35 ± 4 Nm).

3. If the diaphragm disc (B13) was removed from the stem (B35), carefully thread the stem into the

disc. Wrench on the last 1" (25 mm) of the stem closest to the disc, and tighten to 200 ± 10 foot

pounds (270 ± 14 Nm). The remainder of the stem is a bearing surface, and must remain free

of wrench marks and scratches.

September 2015

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