While any pressure may be used to actuate the valves, we have found that regulating {HEAD ~ the air pressure} at the service station 14 to {TAIL ~ about 75 to 90 psig} is preferred to establish precise control of the dispenser apparatus 
to
While any pressure may be used to actuate the valves , we have found that regulating { HEAD ~ the air pressure } at the service station 14 to { TAIL ~ about 75 to 90 psig } is preferred to establish precise control of the dispenser apparatus
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH