ASAHIAVVALVES Installation,OperationandMaintenanceManual
Diaphragm Valves Type 15 1
(1) General operating instructions
○Operate the valve within the pressure Vs temperature range.
(The valve can be damaged by operating beyond the allowable range.）
○Select a valve material that is compatible with the media, refer to “CHEMICAL RESISTANCE ON ASAHI
AVVALVE”.
(Some chemicals may damage incompatible valve materials.)
○Diaphragm part may become loose after long term storage or unused period, or by the change of temperature
during operation. Check it, and re-tighten the bolt diagonally, refer to the torque value on page 6.
○Adjust the stopper when the seat leaks during operation.
○Do not exert excessive force in closing or opening the valve.
○The valve is not designed to bear any kind of external load. Never stand on or place anything heavy on the valve
at anytime.
○When the valve is disposed of, contact waste disposal specialist.
(The valve generates toxic gas.)
○The valve should be installed at place where space for periodic
inspection & maintenance is sufficient.
○Do not store or install the valve near any heat source or hot
surface.
(The valve may cause deformation, destruction, and fire.)
(2) General instructions for transportation, unpacking and storage
○Keep the valve in its original packaging until needed for installation.
○Avoid contact with any coal tar creosote, insecticides, vermicides or paint.
(The force of swelling may damage the valve.)
○The valve is not designed to handle any kind of impact. Avoid throwing or dropping the valve.
○Avoid scratching the valve with any sharp object.
Bonnet tightening
torque value
N-m {kgf-cm} [lb-inch]
Nom. Size
mm (inch)
Rubber PTEF
125 (5)
45.0
{459}
[400]
45.0
{459}
[400]
150 (6)
45.0
{459}
[400]
45.0
{459}
[400]
