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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.
＊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
Leakage at the outlet
side.
Operates at pressures
lower than the set pre-
ssure.
Does not operate even
though the pressure
reaches the set pre-
ssure.
Cause
A scale is stuck between
the valve ⑦ and valve
seat ②.
The piping on which the
product is installed vibr-
ates.
There is back pressure on
the piping at the outlet
side.
Specifications of the prod-
uct and conditions for usa-
ge do not coincide.
The pressure gauge does
not work properly
Changes occurred in the
set pressure of the prod-
uct.
Specifications of the safety
valve and conditions for
usage do not coincide.
The pressure gauge does
not work properly
Changes occurred in the
set pressure of the safety
valve.
The valve holder ⑩ and
the guide ⑪ got stuck to-
gether.
- 7 -
Measures and treatment
Follow the procedures in 8.2(2) and operate
the safety valve. Contact us If the leakage
still fails to stop.
This product cannot be used on devices and
equipment that vibrate considerably.
Review and change the piping layout.
Check the set pressure printed on the
nameplate. Exchange the product if the
conditions for usage do not coincide.
Calibrate or exchange the pressure gauge.
The readjustment of set pressure is needed.
Please contact us.
Check the set pressure printed on the
nameplate. Exchange the product if the
usage conditions do not coincide.
Calibrate or exchange the pressure gauge.
The readjustment of set pressure is needed.
Please contact us.
The product needs to be disassembled and
cleaned. Please contact us.
■EＰＤＴ－１６８a■
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