ASAHI AV VALVES Installation Operation and Maintenance Manual
Butterfly Valves Type57L-IS (Lug style) 16
(10) Adjustment procedure for stopper gear type
‚óŹ Allen Wrench
The adjustments for full-opened and full-shut position are step-less, and it can be done with the stopper
adjuster.
Adjustment for Full-shut (Full-opened) position
1) Remove the rubber cap of Full-closing (Full-opening)
adjuster.
2) Loosen the first stopper hex-bolt completely by Allen
Wrench.
3) Adjust the disc of valve to required position.
4) Tighten the stopper hex-bolts.
5) Put the rubber cap of Full-closing (Full-opening)
adjuster back on gearbox.
(11) Inspection items
- Perform periodic maintenance. (Leakage may develop due to temperature changes or over periods of
prolonged storage, rest or operation.)
Inspect the following items.
(1) Check for flaw, crack, or deformation on the valve.
(2) Check for leaks to the outside.
(3) Check for the deformation of seat due to improper installation of valve.
(4) Check for the smoothness of handle operation.
Necessary Items
Ad
j
uster for Ful
l
-
Shut Positio
n
Ad
j
uster for Ful
l
-
O
p
ened Positio
n
Rubber Ca
p
Caution
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