The control provides quick response and actuates the level control to effect accurate maintenance of {HEAD ~ the required liquid level} in {TAIL ~ an air pressure control system} or, for example, a variable resistance control in an electrical control system 
The control provides quick response and actuates the level control to effect accurate maintenance of { HEAD ~ the required liquid level } in { TAIL ~ an air pressure control system } or , for example , a variable resistance control in an electrical control system
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH