The valve device in the closed system, in which the bellows 11 and 12 are parts, takes {HEAD ~ a position} such that flow from the bellows 11 into {TAIL ~ the bellows} 12 is stopped 
The valve device in the closed system , in which the bellows 11 and 12 are parts , takes { HEAD ~ a position } such that flow from the bellows 11 into { TAIL ~ the bellows } 12 is stopped
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 OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH