1. Can you operate a control valve without a I to P converter ?

Answer- Yes , we can operate cv without I/P converter,just we have to adjust the regulator output air pressure according to I/P rated output by adjusting the knob of regulator correspondingly kg f/cm2 to 1.02 kg f/cm2 manually. the output of regulator should go to the input of mechanical positioner,supply pressure should remain as per cv characteristic and the output from the mechanical positioner should go to diaphragm of control valve via airlock relay.