Jordan Valve Mark HPX and HPAX Series Globe & Angle Style Панель управления - Manual (Page 5)

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4. Back off the packing flange nuts (key 2) until
the packing is free of constriction against the
valve plug stem (key 20). Remove any
additional equipment from the valve plug
stem threads, including the travel indicator disk
and stem locknuts.
5. When removing the bonnet ensure the valve
plug and stem assembly (keys 20 and 22)
remain off the seat ring (key 23). This will
prevent damage to the seating surfaces as a
consequence of the assembly falling from
the bonnet after being partially raised.
6. Apply caution to avoid damage to the gasket
seating surface.
7. Caution must be used when handling the Mark
HPXd and HPAX2 piston rings. These rings are
brittle and in two pieces.
8. Remove the bonnet in the following steps. Do
not remove a jammed bonnet with equipment
that can store energy. Sudden release
of the bonnet can result in unexpected and
potentially dangerous movement. If the
cage becomes jammed it is important to provide
support for the cage. This will prevent the cage
from falling unexpectedly.
9. Loosen the bonnet hex nuts (key 8) which attach
the bonnet to the valve, by approximately 1/8 of
an inch (3mm).
10. Pry between the bonnet (key 6) and valve body
(key 21) to loosen the body to bonnet gasket
joint. Continue prying around the bonnet until the
bonnet loosens. If no fluid is released from the
joint, unscrew the bonnet nuts (key 28)
completely.
11. Carefully remove the bonnet and valve plug
assembly (key 6, 20, 22) as a unit. Ensure that
the valve plug and stem assembly (keys'
20 and 22) remains on the seat ring (key 23)
and avoid nicking or scratching the gasket seal-
ing surface.
12. To remove the bonnet from the valve stem
remove the bonnet hex nuts (key 8). Carefully
lift the bonnet off the valve stem. In the event
that the valve plug and stem assembly become
detached they can be tapped back down with a
lead or brass hammer. Place the bonnet on a
suitable surface such as wood or cardboard to
protect it from damage.
13. Remove parts in this order:
13.1. Valve Plug Assembly (key 20, 22)
13.2. Bonnet Gasket (key 19)
13.3. Cage (key 12)
13.4. Seat Ring (key 23)
13.5. Seat Ring Gasket (key 24)
14. Clean all gasket surfaces with a wire brush, fol-
lowing the direction of the serrations.
15. Cover the valve body openings to protect the
gasket surfaces.
16. Unscrew the packing flange nuts (key 2)
17. Remove the following from the bonnet:
17.1. Packing flange (key 3)
17.2. Upper wiper (key 13)
17.3. Packing follower (key 14)
18. Push the remaining packing parts from the valve
side of the bonnet. This can be done with a
rounded rod or any other tool that will not cause
damage or scratch the packing wall.
19. Clean the packing box and the following metal
components: spring or lantern ring,
packing box ring, packing follower and,
if required, the v-ring packing washer. Finish all
required maintenance.
20. Examine the valve stem threads for sharp edges
that may damage the new packing. Emery cloth
or a whetstone can be used to smooth out any
sharp edges or burrs.
21. Remove the protective covering from the valve
body. Using a new seat ring gasket (key 24) and
bonnet gasket (key 19), install the seat ring (key
23) and cage (key 12).
22. Install the stem and plug assembly (key, 20, 22).
Slip the bonnet (key 6) over the stem and line it
up with the studs.
23. Replace the packing hex nuts (key 2)
23.1. For pre-lubricated hex nuts (identified
by the black film coating on the nut
threads) tighten the hex nuts finger tight.
23.2. For all other nuts, Jordan Valve recom-
mends that you lubricate the stud
threads with Never Seez Pure Nickel
special lubricant or equivalent. Tighten
the hex nuts finger tight.
24. To centre the trim, the valve will need to be
stroked several times. Using proper bolt
ing procedures tighten the nuts to no more than
1/4 of the torque values specified in Table 4.
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