The valve 11 has {TAIL ~ a housing} 12 with {HEAD ~ a spring} 13 arranged in it 
The valve 11 has { TAIL ~ a housing } 12 with { HEAD ~ a spring } 13 arranged in it
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH