ASAHI AV VALVES Installation Operation and Maintenance Manual
Butterfly Valves Type57L-IS (Lug style) 11
(7) Operating procedure
- Do not use the valve to fluid containing slurry. (The valve will not operate properly.)
- The installed valve must never be opened or closed when foreign matter such as sand is present
in the pipeline.
- Do not exert excessive force in closing the valve.
- When operating the handle, be sure to do so with your hand. (Using a tool may damage the handle.)
1) Open and close the valve by turning handle smoothly.
(Turn clockwise to close and counterclockwise to open.)
2) In case of lever type {3”-8” (80-200mm)}, the direction of handle is same as the disc as shown in Fig. 7-1.
For the full-shut (Close) position, the handle is perpendicular to the piping axis direction.
For the full-opened position, the handle is parallel to the piping axis direction.
3) In case of gear type {3”-8” (80-200mm)}, the indicator shows the position of the disc on the top of gear box.
For the full-shut (close) position, the indication shows Shut (S).
For the full-opened position, the indication shows Open (O).
Full- Opened Positio
n
Full-Shut (Close) Position Full- Opened Position
Fig. 7-1
Caution
Full- shut Positio
n
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