IOM-DM MPT100-2018
Page 3
WARNING
-
Do not remove packing gland while the line is under pressure. Personal injury could occur.
D. Valve Disassembly-
WARNING
Use extreme caution when removing the flanged valve from the pipeline to prevent personal injury
that may be caused by “cold springing” of the piping.
CAUTION
V
alves shall be adequately supported prior to unfastening the studs and nuts that hold the valve in line and
secured with lifting straps or slings to hold the weight of the valve.
D1. Remove the threaded end caps and lift the valve from the line for service. Note – care should be taken to
avoid scratching or damaging the threaded end caps. Damaged gaskets must be replaced prior to
Reinstalling in the line.
D2. Loosen handle nut and remove handle. Remove spring washer as well.
D3. Mark each threaded end cap to the body joint. This is to allow ease of alignment in re-installation.
D4. Safely place the valve on a clean, secure and stable work surface.
D5. Protect the end caps when handling to prevent scratching and damage.
D6. EXTREME CARE should be taken upon ball removal as not to scratch seating surface or the
stem, which will result in leakage after reassembly.
D7. Remove Seats and Gaskets. Use caution to prevent damage to metal parts.
D8. Remove lock washer, stem nut, packing follower, stem packing & thrust bearing.
D9. Take ball & stem out of valve body, remove Stem Bushing.
CAUTION
Use extreme care in handling the ball to avoid damage. The stem must be removed from the inside of the body.
Gently tap the top of the stem with a non-metallic mallet. The thrust washer should come out with the stem.
Stem packing can now be removed. If a packing pick is used to remove packing, care must be taken not to
scratch any surface.
Visual Inspection-
Clean and inspect all metal parts. It is not necessary to replace the ball and stem unless the seating surfaces
have been damaged by abrasion or corrosion. Flo-Tite strongly recommends that all seats, seals, and packing
be replaced whenever a valve is disassembled for reconditioning. This is the surest protection against
subsequent leakage after reassembly. Replacement parts are sold in kit form. Refer to the metal tag
attached to the side of the valve body to identify the specific sealing materials used. Kits can be obtained via
the local Flo-Tite Distributor. Replacement parts should be purchased prior to valve disassembly. Required
information to purchase replacement parts include:
a. Line size
b. Model designation
c. Seat/seal materials – see stamping on metal tag
attached to the valve body.
Содержание DM MPT100SS
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