CHART Cryo-Cyl80HP, Руководство по эксплуатации продукта

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37
Maintenance Product Manual - Liquid Cylinders
Rebuilding the Operational Valves
The valves that are used on the Dura-Cyl ® /Cryo-Cyl ® Liquid
Cylinder models have a spring loaded rotary stem. This
automatically compensates for thermal shrinkage and wear.
When a defective valve is suspected, follow this procedure to
repair it:
Caution! To avoid binding due to freezing
at cryogenic temperatures, entry
of moisture into the upper valve
stem area must be prevented.
Seals, gaskets and washers
must be in good condition and
installed carefully and properly.
Torque recommendations must
be strictly followed.
Disassembly
1
Open valve by turning hand wheel counter-clockwise as
far as it will go to release any trapped gas in the system.
Caution! Do not apply force after valve is
fully open.
2
Using a screwdriver, remove hand wheel screw and
washer (Items 3 & 14) by turning counter-clockwise to
allow removal of spring retainer, washer, spring, seal
washer, seal, hand wheel, and bonnet washers (Items 2,
8, 4, 13, 10, 1 and 7). Discard these parts.
3
Using a large adjustable wrench to hold valve body,
remove and discard bonnet (Item 5) by turning counter-
clockwise with a 15/16” socket wrench that is capable
of developing at least 1000 in/lbs torque.
4
Remove these parts from the valve body and discard:
stem, stem gasket, seat disc and nipple assembly, and
bushing
5
Inspect body and clean if necessary, be sure interior and
seal areas are free of dirt, residue, and foreign particles.
Caution! Do not scratch or mar internal
surfaces of valve.
Figure 25
Item Description Qty PN
1 Handwheel 1
Included in Valve
Repair Kit PN
9715759
(Except Item
11 which is not
available as a
repair part)
2 Spring Retainer 1
3 Screw 1
4 Spring 1
5 Bonnet 1
6 Stem 1
7 Bonnet Washer 2
8 Washer 1
9 Bushing 1
10 Seal 1
11 Body and Tube 1
12 Seat Disc & Nipple
Assembly 1
13 Seal Washer 1
14 Washer 1
15 Gasket 1
Reassembly
1
Partially thread seat disc and nipple assembly (Item
12) (seat disc first), into large end of bushing (Item 9),
leaving tang of nipple assembly exposed about 1/3”
beyond top of bushing (nipple must rotate freely in
bushing).
2
Insert seat disc and nipple assembly (Item 12) (seat
disc first), with attached bushing, into valve body until
properly seated.
3
Place stem gasket (Item 15) carefully over stem (Item 6)
convex side facing downward
4
Insert slotted end of stem into valve body, making
sure that slot fully engages tank of seat disc and nipple
assembly