Installation, Operation and Maintenance Manual
󲷇H-A058-E-12󲷈 Diaphragm Valve, True Union Diaphragm Valve (15-50mm, 1/2”-2”) Pneumatic Actuated Type AI
23
< Adjustment method for stopper on site >
When adjusting the stopper at the site, it may be difficult to confirm the position where the leak slightly starts in Step 7.
In that case, adjust according to the following method. (It will be the method of steps 5 to 10)
5) Close the valve completely with air.
6) Attach the stopper [51] to the indicating rod [31] and tighten until it stops rotating by hand.
(At this time, we recommend that you draw a mark that is a mark of rotation on the stopper [51].)
7) Open the valve completely with air.
8) Using the table below as a guide, rotate the stopper [51] clockwise from the position of step 6.
Rotation number of stopper (As a guide)
Nominal
size
Rotation number
Actuation
Double acting *)
Air to open type
Air to shut type *)
0.7MPa
Diaphragm
Rubber
PTFE
Rubber
PTFE
Rubber
PTFE
Rubber
PTFE
15mm ( ½” )
1 ½
3/4
1/2
1/4
1/2
1/2
1/2
1/2
20mm ( ¾” )
1 ¼
1/2
3/4
0
1/2
1/4
3/4
0
25mm ( 1” )
1 ½
1/4
1
0
3/4
0
3/4
0
32mm ( 1¼” )
1 ½
1/4
1
0
3/4
0
3/4
0
40mm ( 1½” )
2 ½
1 ¼
1 ½
3/4
1
1/2
1 ½
1
50mm ( 2” )
1 ¾
3/4
2
3/4
2
0
1 ½
1/2
*) Set air operating pressure of double acting and air to close to 0.4 MPa.
9) Fix stopper [51] with spanner wrench and use spanner wrench to tighten nut [52].
10) Repeat the full open and fully closed condition by air the valve, and confirm that there are no fluid leaks.
If fluid leaks, the stopper [51] one quarter in counterclockwise direction after step 2 and 3, return to step 9 and repeat
until there is no leak.
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