In the exemplary embodiment shown in FIG 1, the relief opening is connected with {HEAD ~ a return line} 41 that leads to pressure {TAIL ~ medium} reservoir 39, and a 2/2 way magnetic valve 42 having a spring return mechanism is used as shutoff valve 40 
leads to
In the exemplary embodiment shown in FIG 1 , the relief opening is connected with { HEAD ~ a return line } 41 that leads to pressure { TAIL ~ medium } reservoir 39 , and a 2/2 way magnetic valve 42 having a spring return mechanism is used as shutoff valve 40
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH