Troubleshooting - TLV VB3 Instruction Manual

Troubleshooting

NEVER apply direct heat to the float. The float may explode due to
increased internal pressure, causing accidents leading to serious injury
WARNING
or damage to property and equipment.
When disassembling or removing the product, wait until the internal
pressure equals atmospheric pressure and the surface of the product
CAUTION
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.
When the product fails to operate properly, use the following table to locate the
cause and remedy.
Problem
Air is leaking from places
other than the air
intake/discharge port or
the air intake port
No air is discharged
(blocked)* or discharge
is poor
Abnormal flow sounds
during normal operation
Water leaks when the
valve seat or check valve
seat are closed
The valve seat or check
valve seat does not
close and water is
blowing
*NOTE: Once the air intake/discharge port closes, it will remain closed until internal pressure
drops to near or below atmospheric pressure. This condition may be confused with a
malfunction (blocked). If air is expected to accumulate in the piping during operation,
use together with an automatic air vent.
Cause
Gaskets are warped or damaged
Improper tightening torques were
used (Cover bolts or intake pipe
nuts are loose)
The trapped air cannot displace the
water in the piping
The valve seat is clogged with dirt
or foreign matter
The main connection piping, air
intake/discharge port piping or air
intake port piping is clogged
The check valve disc is catching
due to wear, dirt, rust, etc.
There is a build-up of rust or scale
on the valve seat or the valve seat
is damaged
Coil spring is dislodged or broken
The float is misshapen, dirty or has
a film build-up
The check valve disc is catching
due to wear, dirt, rust, etc.
There is a build-up of rust or scale
on the valve seat/check valve seat
or the valve seat/check valve seat is
damaged
The installation angle of inclination
is incorrect
The float is damaged or filled with
water
The check valve disc is catching
due to wear, dirt, rust, etc.
There is a build-up of rust or scale
on the valve seat/check valve seat
or the valve seat/check valve seat is
damaged
Remedy
Replace with new gaskets
Tighten to the proper torque
Correct the main connection
piping
Clean or replace with a new
valve seat
Clean the piping
Clean or replace with a new
valve seat/check valve seat
Clean or replace with a new
valve seat
Replace with a new coil spring
Clean or replace with a new
float
Clean or replace with new
parts related to this
phenomenon
Clean or replace with a new
valve seat/check valve seat
Correct the installation
Replace with a new float
Clean or replace with a new
check valve disc
Clean or replace with a new
valve seat/check valve seat
172-65471MA-06 (VB3/VB3-H) 1 Oct 2021
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