Switching apparatus, including sensors for detecting the condition of the system, operate to close the first valve apparatus in response to pre {HEAD ~ determined threshold values} of {TAIL ~ such condition} 
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Switching apparatus , including sensors for detecting the condition of the system , operate to close the first valve apparatus in response to pre { HEAD ~ determined threshold values } of { TAIL ~ such condition }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL