TLV MC-COSR-16, Инструкция по эксплуатации

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172-65185A-08 (MC-COSR Multi-control Valve) 20 Nov 2014
Pressure Reducing Valve Troubleshooting
Problems are classified as follows:
1. The secondary pressure does not increase.
2. The secondary pressure cannot be adjusted or increases abnormally.
3. Hunting occurs (fluctuation of the secondary pressure).
4. Chattering occurs (a heavy mechanical noise).
5. Abnormal noises.
Major causes for the above problems are usage under non-specified conditions (out
of specification), insufficient pressure or flow rate, and clogs by dirt and scale.
Be sure to check for these causes.
To ensure performance for a long period of time, it is recommended that the Safety
Considerations and Adjustment sections be reviewed.
Troubleshooting Chart
Problem Symptom Cause Remedy
The body is not
warm No steam is being supplied
or the inlet valve is closed Check upstream steam
pipeline Secondary
pressure
does not
rise
The body is warm,
but the pressure
does not increase The screens or strainer are
clogged Clean or blow down
The motor is not
turning over The controller is
malfunctioning Check, repair
The pilot screen is clogged Clean
There is insufficient steam
flow
Check the flow; replace
the MC-COSR if necessary
The piston is clogged with
dirt Clean; check the piston
ring
The piston ring is worn Replace with a new
piston ring
The small hole on the piston
is clogged Clean
There is a dirt build-up on the
sliding surfaces of the pilot
valve, piston or main valve Clean
Flow rate exceeds rated
flow rate Check the flow rate;
replace with a larger size
The adjustment screw has
seized Replace with a new
adjustment screw
The diaphragm is distorted
or damaged Replace with a new
diaphragm
There is fluctuation in steam
consumption Check flow rate; replace
the MC-COSR if necessary
Secondary
pressure
cannot be
adjusted or
increases
abnormally
Adjustment is
difficult, and set
pressure varies
The selected model is
inappropriate for the service
conditions (specifications) Check the model
selection; replace the
MC-COSR if necessary
Troubleshooting continued on next page