means for separating the compressed air flowing in the instrument air path into a first path which provides actuating air to the means for controlling operation of the inlet valve and {HEAD ~ the means} for controlling {TAIL ~ operation} of the depressurizing valve means, and a second path which provides a source of signal air 
means for separating the compressed air flowing in the instrument air path into a first path which provides actuating air to the means for controlling operation of the inlet valve and { HEAD ~ the means } for controlling { TAIL ~ operation } of the depressurizing valve means , and a second path which provides a source of signal air
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