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Troubleshooting (Valve)
Check the failure seen on the valve referring
Failure
to the following, and take appropriate
measure.
Switching
The valve does not switch.
failure
Check the part leaking air.
1. The OUT port has a leakage.
Leakage
2. The ＲＥＴＵＲＮ port has a leakage.
(When the 3 port valve is turned on.)
Cause
1) Reduction of pilot pressure
The pressure of a pilot signal (air
pressure) reduced and caused the
operation failure.
2) Failure of pilot signal source
(solenoid valve, etc.)
The source of a pilot signal (solenoid
valve, etc.) fell in the operation failure.
3) Sticking of valve body
The valve body stuck to paint, and
became unable to move, which caused
the switching failure of the valve.
1) Gelling or clogging of paint
Paint gelled or clogged, which caused
the sealing failure of the valve body
and leakage from the OUT port.
2) Insufficient tightening of
mounting nut
The mounting nut to tighten the valve
was not given enough torque, which
caused the seating failure at the OUT
port between the base and valve and
leakage from the OUT port.
3)The permanent deformation
compressed of O-ring (material:
special FKM)
The
permanent
compressed is large due to the
characteristics of the O-ring, so the
compression is reduced, leading to
leakage of fluid from the OUT port.
1) Gelling or clogging of paint
Paint gelled or clogged, which caused
the sealing failure of the valve body
and leakage from the RETURN port.
2) 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
leakage from the RETURN port.
3) Insufficient tightening of
mounting nut
The mounting nut to tighten the valve
was loosened, which displaced the
valve so much as to let the O-ring
come off, and caused the leakage from
the RETURN port.
4)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 from the RETURN port.
24
Remedy
Adjust the pilot signal pressure to a
specified range.
(Specified pilot signal pressure
range: 0.4~0.7MPa)
Check the pilot signal source
(solenoid valve, etc.).
- Disassemble and clean the valve
body. (Cleaning of the valve P18)
- Replace the orifice body with new
one. (Maintenance parts list P21)
- Disassemble and clean the valve
body. (Cleaning of the valve P18)
- Replace the orifice body with new
one. (Maintenance parts list P21)
Tighten the mounting nut at the
specified torque.
(Specified torque P19:
- Replace the O-ring with new one.
(Maintenance pats list P21)
deformation
- Disassemble and clean the valve
body. (Cleaning of the valve P18)
- Replace the valve with new one.
- 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
(Disassembly/Assembly procedure
P19)
Tighten the mounting nut at the
specified torque.
(Specified torque P19:
- Replace the O-ring with new one.
(Maintenance pats list P21)
2.5~3.5Nm)
of
the
base.
2.5~3.5Nm)
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