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8.2 Troubleshooting (see 8.3 Exploded draiwing, Fig.4; 8.4 Troubleshooting procedure)
Problem
1. Leakage from the stop valve on bypass
2. External sensing pipe tube is not
3. Needle valve
4. Foreign object pinched between disc
Reduced
.
Ⅰ
5. Loosened hexagon socket head cap
pressure exceeds
prescribed value.
1
6. Damaged diaphragm
（ ※
）
7. Foreign object pinched between
8. Foreign object pinched between spindle
9. Loosened hexagon head nut
10. Loosened hexagon socket head cap bolt
11. Damaged balance diaphragm
12. Strainer at inlet is clogged
13. Needle valve
. Reduced
Ⅱ
pressure does not
14. Foreign object pinched between
reach prescribed
value.
Or,
fluid
fails to flow.
15. Foreign object pinched between spindle
16. Needle valve
17. Loosened hexagon head bolt
18. Loosened hexagon head bolt
. External
Ⅲ
19. Loosened hexagon socket head cap
leakage
20. Damaged diaphragm
21. Loosened hexagon socket head cap bolt
1 00 kPa or higher outlet pressure exceeding will lead to damage of internal components. Replace the following
※ １ ：
parts
Hexagon socket head cap bolt
diaphragm plate
, O-ring
2 1
○
spring washer
, hexagon nut
1 3
○
Presumable cause
pipe.
connected.
is clogged by foreign
3 7
○
materials.
and valve seat
. Damage to disc and/or
2
○
valve seat.
bolt
and/or locknut
2 6
2 5
○
○
2 2
○
diaphragm shell
and slide of top guide
1 9
○
.
8
○
and slide of bottom cover's
1 2
○
○
of top guide
9
is clogged by foreign
3 7
○
materials.
diaphragm shell
and slide of top guide
1 9
○
.
8
○
and slide of bottom cover's
1 2
○
is clogged by foreign
3 7
○
materials.
bottom cover, or damaged O-ring
diaphragm case
bolt
and locknut
2 6
2 5
○
○
2 2
○
on the bottom diaphragm case is
6
○
loosened or O-rings
3
○
damaged
, locknut
2 6
2 5
○
○
, diaphragm shell
2 0
○
1 4
○
1. Close the stop valve. If leakage continues,
replace the stop valve.
2. Connect the external sensing pipe.
3. Purge the foreign materials from needle
valve
4. Remove the foreign object from disc
1 0
○
and valve seat
damaged. If the seat of valve is damaged,
consult us.
5. Tighten hexagon socket head bolt
locknut
6. Replace diaphragm
7. Remove foreign object from diaphragm
shell
8. Remove foreign object from spindle
guide .
and slide of bottom cover's
1 7
○
of valve
9. Tighten hexagon head bolt
1 4
○
10. Tighten hexagon socket head cap screw
○
9
○
11. Replace balance diaphragm
7
12. Clean the screen of the strainer.
13. Remove foreign material from needle
valve
14. Remove foreign objects from diaphragm
shell
15. Remove foreign matters from spindle
guide
and slide of bottom cover's
1 7
○
16. Remove foreign material from needle
valve
of
17. Tighten hexagon head bolt
1 8
○
bottom cover or replace O-ring
3
○
on top
18. Tighten hexagon head bolt
2 8
○
diaphragm case
19. Tighten hexagon socket head cap bolt
2 6
○
20. Replace diaphragm
21. Tighten lower hexagon socket head cap
bolt
and
are
replace O-rings
4
○
, washer
, top diaphragm plate
2 4
○
, balance diaphragm
1 9
○
13
Corrective action
.
3 7
○
. Replace the disc
2
○
.
2 5
○
.
2 2
○
and slide of top guide
1 9
○
on top guide.
.
3 7
○
and slide of top guide
1 9
○
.
3 7
○
and locknut
.
2 5
○
.
2 2
○
on the bottom diaphragm case; or
6
○
and
3
○
○
, diaphragm
2 3
○
, spindle
, disc
7
1 2
○
○
■ E P D T - 1 7 9 c ■
1 0
○
if
1 0
○
and
2 6
○
.
8
○
1 2
○
guide
1 7
○
on valve.
1 4
○
○
.
7
.
8
○
1 2
○
guide
1 7
○
on
1 8
○
.
3
○
on top
2 8
○
.
4
, bottom
2 2
○
, valve
1 0
1 1
,
○
○
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