The bias is strong enough to provide the fluid seal so that the seal is not compromised when {TAIL ~ the pressure difference} between {HEAD ~ the inlet} and the outlet is small 
The bias is strong enough to provide the fluid seal so that the seal is not compromised when { TAIL ~ the pressure difference } between { HEAD ~ the inlet } and the outlet is small
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH