The plunger 214 therefore is moved to {HEAD ~ the left} by the spring 218 due to the resulting decrease of {TAIL ~ pressure drop} across the orifice 228 
The plunger 214 therefore is moved to { HEAD ~ the left } by the spring 218 due to the resulting decrease of { TAIL ~ pressure drop } across the orifice 228
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH