Emerson TESCOM - Page 20

20
TESCOM™ Safety, Installation, Operations & Service Manual
Content
December 2020
Installation Manual
TR000238ENUS-01_12-20
The following steps outline the disassembly of the Multi-Turn and Metering Valves for
maintenance and repair:
1. Clamp the valve body in a vise.
2. Turn the hand knob counterclockwise several turns to ensure the valve stem is not
contacting the seat.
3. Removethehandknobtoexposetheatsontheupperportionofthestemretainer.
NOTE: Upper portion of the valve may also include stem, seal, o-rings seat retainer.
Review correct drawing to ensure that all parts have been disassembled.
4. The 30-1100 series seat is accessed from the bottom of the valve body. Please check
your assembly drawing to verify.
CAUTION
Care must be used to not damage sealing components.
Reassembly
The valve is reassembled in the reverse order of disassembly, observing the following
precautions.
Please reference Bill of Materials and Assembly Drawing for the correct location of the
replacementpartsandcorrecttorquespecications.
1. Inspect all parts and replace those worn or damaged with TESCOM replacement
parts.
2. All parts should be cleaned to the cleanliness level required for safe operation with
themediaandsystemthevalvewillbeusedin.Allpartsintheowstreammustbe
free of particles which could prevent proper seating on the valve stem.
3. Applyathinuniformcoatingofuorocarbongreasetothefollowingparts:threaded
portion of the adjusting screw, the lower part of the threaded area of the stem
retainer, all the o-rings.
NOTE: Do NOT apply any type of grease to the inlet and outlet connections.
4. Valve seat must be installed with the chamfered side towards the valve stem.
5. Thread the stem retainer into body hand-tight. Valve should be placed into a vise and
thestemretainerre-torquedtospecications.SeeAssemblyDrawing.
WARNING
After valve has been reassembled, it must be connected to a pressure source with a media
compatible with the use the valve and pressurized to check for internal and external
leakage and operation characteristics.
3.5.5