Maintenance
Caution
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.
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.
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 and burns or other injury due to malfunction or the discharge of fluids.
Operational Check
A visual 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.
Inspection Item Inspection Method Remedy
Leakage from valve (when
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 area Visual Inspection: Is liquid
leaking from the slit between the
gland and the valve stem?
Coat the gland and the valve
stem thoroughly with grease;
thoroughly grease the V-ring slot;
or replace with a new V-ring
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 recommened torque) or
replace with new gaskets
Leakage from pressure-
bearing parts such as body
and bonnet
Visual Inspection: Is fluid leaking
from the body or bonnet? Replace any pressurized parts at
leak locations
Parts Inspection
When parts have been removed, or during periodic inspections, use the following table to
inspect the parts and replace any that are found to be defective.
Gaskets: Check for warping or scratches (must be replaced with new gasket when product is
disassembled)
Stuffing Box V-ring Packing: Check for warping or damage
Valve Plug & Stem, Valve Seat: Check for damage or scratches
Body, Bonnet: Check for corrosion or damage
10
