Flowserve Vogt Forged Steel Gate - Manual (Page 32)

Flow Control
Vogt Valves
32 Forged Steel Gate, Globe and Check Valves FCD VVENIM2000-02
turns of the handwheel and a few drops of oil applied on the stem
just above the packing will help work in the packing to the stem.
* Vogt has used a one-piece endless cylinder of packing in its
factory-made valves for several years, and if this packing is to be replaced
it will be necessary to remove the cylinder packing from the valve before
repacking. If individual rings have been used, the individual rings can be
removed as necessary. If complete valve disassembly is used during pack-
ing of a valve, the packing cylinder can be used for replacement.
See Section 1 for Packing Cartridge PN.
5.12 Detailed Packing
Instructions
O.S. and Y. Bolted Bonnet Gate Valves
(Typical Series 12111)
(Partial Disassembly Required)
1. Loosen packing gland bolting and free up gland.
2. Remove bonnet bolts and bonnet subassembly.
a CAUTION: Mark the gate and note orientation. The
same gate and orientation shall be maintained upon
replacement.
3. Spin handwheel until stem is removed from yoke nut thread.
4. Pull stem through packing. Rotating the stem during removal
from the packing will aid in this process.
5. Remove packing gland and gland bolting.
6. Remove top ring of packing. This will be a braided graphite
packing. Remove additional packing as required.
7. Add new rings of flexible graphite packing and one new top and
bottom ring of braided packing as required.
8. Replace packing gland and snug up gland bolting evenly.
9. Insert new bonnet gasket. Insert gate/stem into body.
10. Place yoke bonnet subassembly back on stem and rotate hand-
wheel to seat bonnet.
11. Replace bonnet bolts and torque bonnet bolts until bonnet joint
becomes metal-to-metal. A .007" feeler gage may be used to
gage joint. A bonnet/body joint that will accept a .007" feeler
gage is not properly torqued and is not metal-to-metal. Ad-
ditional torque should be applied.
a CAUTION: During the torquing of the bonnet joint, the
valve should be slightly open. This will prevent the
bonnet bolt torque from driving the disc or gate into the
valve seat and will ensure the bonnet joint will go metal-
to-metal.
12. Tighten packing gland bolting evenly.
13. Open and close valve to ensure free operation.
14. Place valve back in service.
Alternate Method
(No Major Disassembly Required)
1. Remove packing gland bolting and free up packing gland.
2. Remove top ring of packing. This will be a braided graphite pack-
ing. Prepare chamber to accept new ring or rings of packing.
3. Split a number of packing rings of flexible graphite as required
and place individual ring in packing chamber using the gland to
ram the packing into the chamber. Stagger packing ring’s sepa-
rations by 90° if more than one ring is required. Replace top
ring of braided graphite packing as required. If total replacement
of packing is necessary, a bottom ring of braided packing shall
be used.
4. Tighten packing gland bolting evenly.
5. Open and close valve to ensure free operation.
6. Place valve back in service.
Packing
O.S. and Y. Bolted Bonnet Globe Valve
(Typical Series 12141)
(Partial Disassembly Required)
1. Loosen packing gland bolting and free up gland.
2. Remove bonnet bolts.
3. Remove handwheel nut and nameplate.
4. Spin handwheel until stem moves through yoke nut loosening
and pushing off handwheel.
5. Remove yoke/bonnet subassembly, rotate stem and totally
remove stem from yoke thread.
6. Pull stem through packing. Rotating the stem during removal
from the packing will aid in this process.
7. Remove packing gland and gland bolting.
8. Remove top ring of packing. This will be a braided graphite
packing. Remove additional packing as required.
9. Add new rings of flexible graphite packing and one new top and
bottom ring of braided graphite packing as required.
10. Replace packing gland and snug up gland bolting evenly.
11. Place stem back into yoke/bonnet subassembly.