Jordan Valve Mark EZ Series Globe Style Control Valve User Manual

Page 4

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Replacing Packing Continued,

7. Remove the bonnet gasket (key 10, figure 11)

and cover the opening in the valve to protect the

gasket surface and to prevent foreign material from

getting into the valve body cavity.

8. Remove the packing flange nuts, packing flange,

upper wiper, and packing follower (keys 5, 3, 12, and

13, figure 10). Carefully push out all the remaining

packing parts from the valve side of the bonnet using

a rounded rod or other tool that will not scratch the

packing box wall. Clean the packing box and the metal

packing parts.

9. Inspect the valve stem threads and the packing

box surfaces for any sharp edges which might cut

the packing. Scratches or burrs could cause pack-

ing box leakage or damage to the new packing. If the

surface condition cannot be improved by light sanding,

replace the damaged parts.

10. Remove the covering protecting the valve cavity

and install a new bonnet gasket (key 10, figure 11),

making sure the gasket seating surfaces are clean

and smooth. Then slide the bonnet over the stem

and onto the stud bolts (key 15, figure 11), or onto

the valve cavity if cap screws (not shown) are used

instead.

Using proper tightening procedures in step 11 com-
presses the spiral wound gasket (key 12, figure 12)
enough to both load and seal the seat ring gasket
(key 13, figure 11). The tightening procedures also
compresses the outer edge of the bonnet gasket
(key 10, figure 11) enough to seal the body-to-bon-
net joint.

Use accepted bolting practices thread the nuts onto
the studs, and in a crisscross pattern tighten the
nuts. Because of the boltup characteristics of spiral
wound gaskets, tightening one cap screw or nut
may loosen an adjacent cap screw or nut. Repeat
the crisscross-tightening pattern several times until
each cap screw or nut is tight and the body-to-bon-
net seal is made. When the operating temperature
has been reached, perform the torque procedure
once again.

11. Install bolting, using accepted bolting procedures.

The bolt torques in table 1 may be used as guidelines

unless accepted bolting procedures dictate otherwise.

12. Install new packing and the metal packing box

parts according to the appropriate arrangement in

figure 2. Place a smooth-edged pipe over the valve

stem and gently tap each soft packing part into the

packing box, being sure that air is not trapped

between adjacent soft parts.

13. Slide the packing follower, upper wiper, and

packing flange (keys 13, 12, and 3, figure 10) into

position. Lubricate the packing flange studs (key 4,

figure 10) and the faces of the packing flange nuts

(key 5, figure 10). Install the packing flange nuts.

The torque values discussed in step 14 and shown
in table 2 are recommended guidelines only and
are presented as a starting point for this procedure.
Tightening the packing flange nuts to a torque value
that exceeds the table guidelines, in order to obtain
a seal, may indicate other problems.

14. For spring-loaded PTFE V-ring packing,

tighten the packing flange nuts until the shoulder on

the packing follower (key 13, figure 10) contacts the

bonnet.

For other packing types,

tighten the packing flange

nuts alternately in small equal increments until one of

the nuts reaches the minimum recommended torque

shown in table 2. Then, tighten the remaining flange

nuts until the packing flange is level and at a 90-de-

gree angle to the valve stem.

15. Mount the actuator on the valve body and

reconnect the actuator and valve stem according to

the procedure in the appropriate actuator instruction

manual.

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