Thank you Samarjit Sen and US Iceman,

Dear Samarjit Sen,
I have that article but thanks anyway.

Dear US Iceman,
Thanks for your explanation.

What I understand is this :
In normal TEV inlet pressure (Pc) acts as an opening force but in balanced port Pc is canceled out.
BUT still valve capacity depends on Dp across the TEV. Dp depends on Pc too.

Low Pc decreases the capacity but it does not increase the super heat. IS this the case?

Sorry guys, either I am confused or I am getting old.

Thanks again.
Cheers