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5.2. Periodic inspection
Conduct periodic inspection once a year to maintain functions and performance of the
product. If abnormalities were detected, refer to "5.3 Troubleshooting" and take measures.
5.3. Troubleshooting
Trouble
External leak
from the
gland part
Seat leakage
Abnormally
high
operation
torque
Abnormal
noise
5.4. Cautions and procedures for seat replacement
⚠Caution
(1) When replacing the seat, be careful not to drop parts. Keep the dismantled parts on
soft cloth so that they will not be damaged.
*Damage on the parts may impair the product's function.
(2) Do not disassemble the product unnecessarily for purposes other than replacing the
seat.
*Disassembly may impair the product's function.
Seat replacement procedure
(1)
Fully close the valve.
(2)
Detach the retainer bolts [9] and the seat retainer [2].
(3)
Remove the seat [4] and clean the seating part of the body [1] and the
retainer [2].
(4)
Install the new seat [4].
(5)
Install the seat retainer [2] and fix it with retainer bolts [9].
6. Disposal
When disposing the product, refer to the drawing to check material of each part and dispose
them separately according to local rules and regulations.
Inspection items
○Whether opening and closing operation is normal
○Whether there is abnormal noise
○Whether there is external leak
Cause
Nut [11] is loose.
Seat [4] is damaged.
Disc [3] is damaged.
Foreign substances are
stuck.
Nut [13] is overtightened.
Seat [4] is damaged.
Foreign substances are
stuck.
Nut [11] is loose.
Remedy
Tighten nut [11]. If the leak does not stop,
replace the product.
Replace seat [4].
Replace the product.
Remove the foreign substances.
Loosen nut [11] and re-tighten so that
there is no leak (but not too tightly).
Replace seat [4].
Remove the foreign substances.
Tighten nut [11]
-6-
■EPDT-383■
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