Emerson Fisher GX Manual de instrucciones descargar pdf (Pagina 20)

Instruction Manual

D103175X012

GX Valve and Actuator

August 2011

5. Use a wrench to unscrew the plug/stem assembly (key 3) from the stem extension (key 40) or from bellows/stem

assembly (key 49) as follows:

a. Insert the wrench onto the stem extension hex flats (see figures 22 and 23).

CAUTION

In the following procedure, take precautions to ensure the valve plug and stem finish are not damaged.

b. Clamp the plug/stem assembly (key 3) and holding it stable, unscrew the stem extension (key 40) or

bellows/stem assembly (key 49). Take precautions to ensure the valve plug and stem finish are not damaged.

Note

There is a stem assembly locking insert (figures 22 and 23, key 48) in the valve plug/stem extension assembly. It is possible this

insert may drop out during stem disassembly. If this is the case, ensure it is retained for reassembly of the valve stem to the stem

extension.

6. Remove the plug/stem assembly (key 3) and bellows/stem assembly (key 49) from the extension bonnet. Remove

the bellows gasket (key 50).

7. Proceed to the Seat Ring Removal section.

Seat Ring / Cage Removal

CAUTION

Use care to avoid damaging the gasket sealing surfaces.

The surface finish of the valve stem (key 3) is critical for making a good packing seal. The seating surfaces of the seat ring

(key 2), cage (key 99), and the valve plug (key 3) are critical for tight shutoff and should therefore also be treated with care

and properly protected.

1. Packing parts can be removed from the bonnet if desired. Replace these parts as described in the section on Packing

Maintenance.

2. Use a seat ring tool made according to the dimensions in figure 5 and table 12 to remove the seat ring (key 2) as

follows:

a. Insert the tool into the valve body. Be certain the tool lugs are engaged in the corresponding recesses in the seat

ring.

b. Use a torque gun or driver having sufficient torque capabilities according to table 8. Connect the gun to a socket

that snugly fits the hex head on the seat ring tool.

c. Insert the socket onto the hex head of the seat ring tool.

WARNING

Be careful to hold t he torque gun, attached socket, and tool at right angles to the seat ring when applying torque. Tilting

the gun and socket while applying torque may cause the lugs on the seat ring tool to suddenly disengage from the lugs on

the seat ring thus causing possible damage to the seat ring and possible personal injury.

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Emerson Fisher GX Manual de instrucciones Pagina 20