A/A = Pneumatic Air to Air. A/SR = Pneumatic Air to Spring Return (fail-safe). E = Electric (motor driven).
A/A = Pneumatic Air to Air. A/SR = Pneumatic Air to Spring Return (fail-safe). E = Electric (motor driven).
气动执行机构气到气(双动)。A/SR=气动执行机构气到弹簧复位(故障安全)。E=电动执行机构(电机驱动)。