A front power piston 7 and a rear power piston 8 are connected to the outer periphery of the valve body 6 at {HEAD ~ locations} which are disposed within the front chamber 4 and the rear chamber 5, respectively, and a front diaphragm 11 and a rear diaphragm 12 are applied to {TAIL ~ the back surfaces} of the power pistons 7, 8, respectively 
A front power piston 7 and a rear power piston 8 are connected to the outer periphery of the valve body 6 at { HEAD ~ locations } which are disposed within the front chamber 4 and the rear chamber 5 , respectively , and a front diaphragm 11 and a rear diaphragm 12 are applied to { TAIL ~ the back surfaces } of the power pistons 7 , 8 , respectively
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 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 OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH