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8.2 Operational inspection (every half year)
(1) Check to see that installation bolts and nuts at the product inlet and outlet, as well as nuts
⑭
installed on the product are all fastened securely.
(2) In case of model AF-7 (lever type), raise the fluid pressure to 75% of the set pressure or
higher, raise the lever, and check to see that the fluid blows out. In case of type AF-7M
(closed type), raise the fluid pressure to the set pressure, and confirm that the product
operates.
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Please contact us if you notice anything abnormal.
8.3 Periodic inspection
Implement various voluntary inspections according to the laws. If you are a general user, please
have the facility or works agent implement the inspection.
8.4 Troubleshooting
Problem
Cause
Measures and treatment
A scale is stuck between
the valve
⑦
and valve
seat
②
.
Follow the procedures in 8.2(2) and operate
the safety valve. Contact us If the leakage
still fails to stop.
The piping on which the
product is installed vibr-
ates.
This product cannot be used on devices and
equipment that vibrate considerably.
Leakage at the outlet
side.
There is back pressure on
the piping at the outlet
side.
Review and change the piping layout.
Specifications of the prod-
uct and conditions for usa-
ge do not coincide.
Check the set pressure printed on the
nameplate. Exchange the product if the
conditions for usage do not coincide.
The pressure gauge does
not work properly
Calibrate or exchange the pressure gauge.
Operates at pressures
lower than the set pre-
ssure.
Changes occurred in the
set pressure of the prod-
uct.
The readjustment of set pressure is needed.
Please contact us.
Specifications of the safety
valve and conditions for
usage do not coincide.
Check the set pressure printed on the
nameplate. Exchange the product if the
usage conditions do not coincide.
The pressure gauge does
not work properly
Calibrate or exchange the pressure gauge.
Changes occurred in the
set pressure of the safety
valve.
The readjustment of set pressure is needed.
Please contact us.
Does not operate even
though the pressure
reaches the set pre-
ssure.
The valve holder
⑩
and
the guide
⑪
got stuck to-
gether.
The product needs to be disassembled and
cleaned. Please contact us.