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