ASAHI AV VALVES Installation,Operation and Maintenance Manual
Diaphragm Valves Type 14 True Union Diaphragm Valves Type14
12
(8) Diaphragm replacement procedure
1)
Drain fluid completely from the pipe line.
2)
Remove valve bonnet from the body.
3)
Turn handle of valve clockwise until it stops.
（
Do not force it
）
.The
compressor should be fully extended out of the bonnet.
4)
Bayonet connection type (standard)
Remove the diaphragm from the compressor by turning it 90
°
and
mount the new diaphragm by reversing step.
Make sure that the pin of inserted metal of diaphragm connects joint
completely.
Threaded connection type
Turn the diaphragm clockwise to remove the diaphragm and
mount the new diaphragm by reversing step.
5)
Mount the bonnet to the valve by reversing step 2. Tighten bonnet bolts
by hand only.
6)
Rotate the handle 360
°
counter-clockwise.
7)
Using a torque wrench, tighten the bonnet bolts in a diagonal, cross-
cross pattern.
Bonnet torque value
Unit : N-m{kgf-cm}[ib-inch]
Nom. Size
15, 20mm
(1/2”, 3/4”)
25, 32mm
(1”, 1 1/4”)
40mm
(1 1/2”)
50mm
(2”)
65mmm
(2 1/2”)
80mm
(3”)
100mm
(4”)
Rubber
3.0
{31}
[27]
5 .0
{51}
[44]
12.0
{122}
[106]
15.0
{153}
[133]
13.0
{133}
[115]
18.0
{184}
[160]
35.0
{357}
310
PTFE
5.0
{51}
[44]
8.0
{82}
[71]
15.0
{153}
[133]
20.0
{204}
[177]
15.0
{153}
[133]
20.0
{204}
[177]
40.0
{408}
[355]
8)
Re-adjust the stopper if necessary.
Necessary items
Wear protective gloves and goggles because some fluid is left in the body.
（
You can be injured by working without then.
）
Bayonet connection
Threaded connection
Inserted metal of diaphragm
Joint
Diaphragm
●
Torque wrench
●
Spanner wrench
●
Protective gloves
●
Goggles
Caution
