Can anybody give me any advanced cause about the continuous damage of diaphragms(reinforced) of pneumatic control valve used for boiler feed water? (reverse acting,air quality good).

In my experiance the typical control valve actuator diaphragms are very robust.  Perhaps you have a high pressure, pre-heated boiler feedwater valve that is too near the actuator diaphragm.  Some old boiler feedwater regulators such as Copes Vulcan may be an example as compared to a typical control valve.

What are the conditions and specifics that apply to your situation?

Also, Ashereng is right that the valve or measurement forum may include more responses.  Consider posting with the details at valve engineering.

Diaphram actuated control valves have been used for BFW service since Noah used them on the Ark.  Well maybe not that long, but for a long long time and have a good service record.  The old regulators did a good job in their day too.

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