172-65742MA-01 (CT20/CT20D) 7 Oct 2021
10
Maintenance
Take measures to prevent people from coming into direct contact with
product outlets. Failure to do so may result in burns or other injury from
the discharge of fluids.
CAUTION
When disassembling or removing the product, wait until the internal
pressure equals atmospheric pressure and the surface of the product
has cooled to room temperature. Disassembling or removing the
product when it is hot or under pressure may lead to discharge of fluids,
causing burns, other injuries or damage.
CAUTION
Be sure to use only the recommended components when repairing the
product, and NEVER attempt to modify the product in any way. Failure to
observe these precautions may result in damage to the product or burns
or other injury due to malfunction or the discharge of fluids.
CAUTION
Operational Check
An inspection of the following items should be done on a daily basis to determine
whether the product is operating properly or has failed. Periodically (at least
biannually) the operation should also be checked.
In the event of failure (malfunction), also refer to the "Troubleshooting" section for
remedies.
Inspection Item
Inspection Points
Remedy for Failure (Malfunction)
Leakage from valve
(when the valve is
closed)
Visual inspection or stethoscope
inspection; is the outlet side
pressure or temperature elevated,
or is there the sound of the
medium flowing?
Adjust the zero/span; if that does
not solve the problem, replace
with a new valve plug & stem
and valve seat
Leakage from gland
section
Visual inspection; is fluid leaking
from the gap between the guide
bushing and the valve stem, or
are there signs it has leaked
previously?
Coat the guide bushing and the
valve stem with grease; if that
does not solve the problem,
replace with new V-ring packing
Leakage from the
gaskets between
any pressurized
parts
Visual inspection; is fluid leaking
from the gasket areas on
pressurized parts?
Apply additional tightening (refer
to recommended torque) or
replace with new gaskets
Leakage from
pressurized parts
such as body and
valve bonnet
Visual inspection; is fluid leaking
from pressurized parts such as
the body or valve bonnet?
Replace any pressurized parts at
leak locations
Parts Inspection
When parts have been removed, use the following table to inspect the parts and
replace any that are found to be defective.
Inspection Item
Gasket(s): Check for warping and damage (Graphite gaskets MUST be replaced if disassembled)
Stuffing Box V-ring Packing: Check for warping or damage
Valve Plug & Stem, Valve Seat: Check for damage or scratches
Body, Valve Bonnet: Check for damages or corrosion
