Jordan Valve Mark ED & ET Series Globe Style Control Valve (1-6) User Manual

Page 4

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Packing Maintenance

TFE V-Ring Packing

Except where indicated, refer to Figure 7 for part de-

scriptions used in the following procedure.

1.

For spring loaded single TFE V-ring packing,

the spring (key 8) maintains the sealing

force on the packing. If leakage is detected

around the packing follower (key 13), tighten

the packing flange nuts (key 5) until the leak-

age stops. If the shoulder of the packing box is

touching the bonnet and leakage cannot be

controlled in this manner, see “Packing Re

placement”.

Packing Replacement

1.

Once the actuator and bonnet have been

separated from the body (refer to Steps 1-2 of

Disassembly procedure), remove the following

from the bonnet:

a.

Packing flange nuts (key 5)

b.

Packing flange (key 3)

c.

Felt wiper (key 12)

d.

Packing follower (key 13)

2.

Clean the packing box bore, spring (key 8),

washer (key 10), and the packing box ring (key

11).

3.

Install the valve plug assembly and mount the

bonnet to the body using new gaskets.

Use the sequence shown in Figure 4 to install

new packing and associated parts. Be

sure not to damage the packing during

installation. Replace the packing

flange (key 3), tighten the

packing flange nuts (key 5) until the shoul-

der of the packing follower (key 13) is ap-

proximately 5/8” from the top of the bonnet. If

leakage is detected around the packing fol-

lower, tighten the packing flange nuts until the

leakage stops.

4.

For graphite packing, tighten the packing

flange nuts to the maximum torque value in

Table 3. Then back off the nuts and retighten

them to the minimum torque value in Table 3.

5.

For other Packing Types, in small equal incre-

ments, tighten the flange nuts until one of the

nuts reach the minimum torque shown in Table

3. Then, tighten the other nut until the packing

flange is level.

6.

Mount the actuator and set the stem connector

to the required travel. Refer to “Making

Up Stem Connection” procedure.

Packing Lubrication

The use of semi-metallic packing requires the use of

a lubricator or lubricator/isolating valve (figure 3). The

lubricator or lubricator/isolating valve is mounted in

place of a pipe plug (key 14, figure 6, 7). For standard

service up to 450

o

F, use Dow Corning lubricant or

equivalent.

Lubricator:

To add lubricant to the packing box, turn

the cap screw in a clockwise direction.

Lubricator/Isolating Valve:

Open the isolating valve,

turn the cap screw in a clockwise direction, then close

the isolating valve.

Lapping Metal Seats

In any valve body, a certain amount of leakage should

be expected with metal-to-metal seating. However, if

the leakage becomes excessive, lapping can enhance

the condition of the seating surfaces of the valve plug

and seat ring. Deep nicks in the seating surface should

be removed by machining rather than lapping. There

are many lapping compounds available commercially.

Be sure to use one of high quality. Apply lapping com-

pound to the bottom of the plug.

In order to position the cage and seat ring properly

and to help align the valve plug with the seat ring, bolt

the bonnet to the body with gaskets (the old gaskets

can be used) in place during the lapping procedure. A

simple handle can be made from a piece of metal se-

cured to the valve stem with nuts. Rotate the handle in

opposite directions to lap the seating surfaces. Once

lapping is complete, disconnect the bonnet, clean the

seating surfaces, reassemble and then test for shutoff.

If leakage is still excessive, repeat the lapping proce-

dure.

Figure 3: Lubricator and Lubricator/ Isolating Valve

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