Troubleshooting (Valve)
Failure
Check the failure seen on the valve referring
to the following, and take appropriate
measure.
Cause
Remedy
Leakage
3. The leak detecting port has a leakage
which can happen for fluid (paint) leakage
.
1)
Twist and cut of O-ring (external face)
The O-ring at the external face of the valve
was twisted or cut during the assembly or
operation of the valve, which caused the
sealing failure and fluid (paint) leakage from
the leak detecting port.
- Replace the O-ring with new one.
(Maintenance pats list P21)
- Apply Vaseline to the O-ring at
the external face of the valve and
to
the
inside
of
the
base.
(Disassembly/Assembly procedure
P21)
2) Internal sealing failure of valve
The sealing failure of the sliding part of
the valve or broken diaphragm caused
the fluid (paint) leakage from the leak
detecting port.
Replace the valve with new one.
3)The permanent deformation
compressed of O-ring (material:
special FKM)
The permanent deformation
compressed is large due to the
characteristics of the O-ring, so the
compression is reduced, leading to
leakage of fluid (paint etc.) from the
leakage detection port.
- Replace the O-ring with new one.
(Maintenance pats list P21)
4. The leak detecting port has a leakage
which can happen for pilot air leakage.
1)
Twist and cut of O-ring (external face)
The O-ring at the external face of the valve
was twisted or cut during the assembly or
operation of the valve, which caused the
sealing failure and pilot air leakage from the
leak detecting port.
- Replace the O-ring with new one.
(Maintenance pats list P21)
- Apply Vaseline to the O-ring at
the external face of the valve and
to
the
inside
of
the
base.
(Disassembly/Assembly procedure
P19)
）
2) Internal sealing failure of valve
The sealing failure of the sliding part of the
valve piston causes the pilot air leakage
from the leak detecting port.
Replace the valve with new one.
Insufficient
flow rate
The flow rate from the OUT port has
reduced.
1)
Gelling or clogging of paint
Paint
gelled
or
clogged,
which
narrowed the fluid path and reduced
the flow rate.
- Disassemble and clean the valve
body. (Cleaning of the valve P18)
- Replace the orifice body with new
one. (Maintenance parts list P21)
2) Reduction of pilot pressure
The pressure of pilot signal (air pressure)
reduced and prevented the valve to
achieve the minimum operating pressure,
which reduced the valve stroke and
narrowed the fluid path resulting in the
reduction of flow rate.
Adjust the pilot signal pressure to a
specified range.
(Specified pilot signal pressure
range: 0.4~0.7MPa)
3) Excessive tightening of mounting
nut
The mounting nut was excessively
tightened, which reduced the valve stroke
and narrowed the flow path resulting in the
reduction of flow rate.
Tighten the mounting nut at the
specified torque.
(Specified torque P19:
2.5~3.5Nm)
Liquid
pool
Insufficient
cleaning
The cleaning effect is unstable and takes a
time. Paint has gelled and hardened. Air has
intruded.
1) Incorrect mounting direction of
valve
Remount the valve referring to the
direction of the IN port of the valve.
(Mounting direction of valve P19)
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2021-06-10 14:35
DG018865
