In a booster relay used along with a control valve pnuematic hookup , it is written 1 psi load produces 2 psi output" .The booster elay receives signal from an i/p converter and its output is connected to the valve positioner.I have seen valve"
Purpose of volume booster is to provide higher volume of output to the control valve, which in some cases, the positioner cannot cater.In your case the booster relay is to be connected in between positioner out put and control valve.Then the valve
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