Emerson 289 Series Gebruiksaanwijzing - Pagina 6

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289 Series

Warning

Avoid personal injury or property

damage from sudden release of

pressure or explosion of accumulated

gas. Before starting disassembly:

• Isolate the relief valve from line

pressure and

• Release trapped pressure from the

valve body and pressure line.

Type 289 A

All key numbers are shown in Figure 6.

1. Loosen the hex nut (key 11) and

unscrew the adjusting screw (key 6) to

relieve spring compression.

2. Unscrew the machine screws (key 8) and remove

the spring case (key 2), the spring seat (key 4),

the spring (key 7), the diaphragm head (key 3) and

the diaphragm (key 5).

3. Inspect the diaphragm and seating surfaces for

damage or wear and replace parts as

necessary. To remove the orifice (key 10)

unscrew it from the body.

4. Reinstall the orifice, the diaphragm, the

diaphragm head, the spring and the spring seat.

5. Reattach the spring case using the machine screws.

6. If a new spring with a different range is installed,

stamp the spring case with the new spring range.

7. Adjust the spring compression according to the

procedures outlined in the Startup section.

Type 289U

All key numbers are shown in Figure 7.

1. Loosen the hex nut (key 11) and

unscrew the adjusting screw (key 6) to

relieve spring compression.

2. Unscrew the machine screws (key 8) and

remove the spring case (key 2), the spring

seat (key 4), the spring (key 7) and the

diaphragm assembly (key 5).

3. Inspect the diaphragm assembly and seating

surfaces for damage or wear and replace

parts as necessary.

4. Reinstall the diaphragm assembly, the spring

and the spring seat.

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5. Reattach the spring case using the

machine screws.

6. If a new spring with a different range is installed,

stamp the spring case with the new spring range.

7. Adjust the spring compression according to the

procedures outlined in the Startup section.

Type 289L

All key numbers are shown in Figure 8.

1. Remove the closing cap (key 14) and the

gasket (key 15) and then unscrew the adjusting

screw (key 6) to relieve spring compression.

2. Unscrew the machine screws (key 8) and then

remove the spring case (key 2), the spring (key

7) and the diaphragm assembly (key 5).

3. Inspect the diaphragm and seating surfaces for

damage or wear and replace parts as

necessary. To remove the orifice (key 10),

unscrew it from the body. Check the pitot tube in

the diaphragm assembly for blockage and

remove any foreign material that might impair

proper operation of the relief valve.

4. Reinstall the orifice, the diaphragm assembly

and the spring.

5. Reattach the spring case using the

machine screws.

6. If a new spring with a different range is installed,

stamp the closing cap with the new spring range.

7. Adjust the spring compression according to the

procedures outlined in the Startup section and

then reinstall the closing cap and gasket.

Types 289HH and 1 NPT 289H

All key numbers are shown in Figure 9.

1. Loosen the hex nut (key 11) and then

unscrew the adjusting screw (key 6) to relieve

spring compression.

2. Unscrew the machine screws (key 8) and remove

the spring case (key 2), the spring seat (key 4)

and the spring (key 7).

3. Unscrew the hex nut (key 24) and remove the

lower spring seat (key 17), the diaphragm

head (key 3) and the diaphragm (key 5).

4. Unscrew the machine screws (key 29) and then

remove the stem guide assembly (key 31) and

attached parts from the valve body (key 1).