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Instruction Manual

D103312X012

GX 3-Way Valve and Actuator

August 2011

Figure 5. Fisher GX 3-Way Flow Direction Nameplate

GE37477_BP_PLAT

BOTTOM-PORT COMMON

SIDE-PORT COMMON

GE37477_SP_PLAT

Valve Trim Maintenance

Key numbers in this section refer to figures 9 and 10. Reference the flow direction nameplate (figure 5) to determine

side-port common (unbalanced) or bottom-port common (balanced) trim style.

Side-Port Common and Bottom-Port Common Trim Disassembly

1. Remove the actuator and bonnet assembly as described in the Replacing Packing section (steps 1 through 10).

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 or

cage (key 2) 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 or cage tool made according to the dimensions in figure 6 and table 6 to remove the seat ring or

cage (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 or cage.

b. Use care to avoid damaging or scratching the bonnet and cage guide surfaces (see figures 9 and 10).

c. Use a torque gun or driver having sufficient torque capabilities according to table 7. Connect the gun to a socket

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

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