9. Trouble Shooting
Refer to sections [10. How to Replace the Components] (P15-19) and [11. Disassembly Drawing] (P20-21).
Category
Failure
1. Air pressure is not supplied to the
inlet.
Check the supply pressure. Ensure that
the supply side ball valve is opened.
―
2. The product is not correctly mounted
in the direction of flow.
Install the product correctly after
confirming the direction of flow. The side
with “1” for IN and “2” is for OUT.
―
3. Pressure regulating spring is
damaged.
Replace the pressure regulating spring.
P15
4
．
Valve spring is damaged.
Replace the valve spring.
P16
5. Foreign matter is caught in the valve
seat or valve sliding O-ring. In case
of back flow function type, foreign
matter may get caught in the check
seal.
Remove the valve and eliminate foreign
materials.
When the condition is not improved,
replace the valve guide assembly and
valve assembly.
P16
6. Valve seat is damaged.
Replace the valve assembly.
P16
1. Foreign matter is caught in the valve
seat or valve sliding O-ring. In case
of back flow function type, foreign
matter may get caught in the check
valve seal.
Remove the valve and eliminate foreign
materials.
When the condition is not improved,
replace the valve guide assembly and
valve assembly.
P16
2. Valve seat is damaged.
Replace the valve assembly.
P16
3. Valve spring is damaged.
Replace the valve spring.
P16
4
．
The valve is fixed in an opened
position.
Clean the valve sliding surface of O-ring
and apply grease additionally.
P16
1. The product is not correctly mounted
in the direction of flow.
Install the product correctly after
confirming the direction of flow. The side
with “1” for IN and “2” is for OUT.
―
2. Diaphragm assembly is damaged.
Replace the diaphragm assembly.
P15
3. Foreign matter is caught in seating
part of the relief valve.
Clean the seating part of the relief valve or
replace the diaphragm assembly.
P15
4
．
Foreign matter got caught in the
valve seat or valve sliding O-ring. In
case of back flow function type,
foreign matter may get caught in the
check valve seal.
Remove the valve guide and clean the
valve seat and valve sliding O-ring (or
check valve seal). After cleaning then,
apply grease to the valve sliding O-ring (or
check valve seal) and valve guide sliding
part.
P16
5. Valve seat is damaged.
Replace the valve assembly.
P16
-13-
Page for
reference
Air leaks from
the bonnet
exhaust port.
Note ) Fluorine grease is recommended when applying additional grease.
Ai
r l
e
a
k
a
g
e
Pre
s
s
u
re
Problem
Countermeasure
Possible cause
The pressure
can not be
adjusted.
The set pressure
does not become
zero even when
the knob is
loosened.
