It will be understood that the atmosphere which is introduced into the variable pressure chamber 203 passes through the internal space of {TAIL ~ the piston} 213 to act upon the second valve seat 222, thus enabling {HEAD ~ the atmosphere} having a control pressure which depends on the magnitude of a current passing through the solenoid 207 to be introduced into the bellows chamber E 
It will be understood that the atmosphere which is introduced into the variable pressure chamber 203 passes through the internal space of { TAIL ~ the piston } 213 to act upon the second valve seat 222 , thus enabling { HEAD ~ the atmosphere } having a control pressure which depends on the magnitude of a current passing through the solenoid 207 to be introduced into the bellows chamber E
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL 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 OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH