For the actuators with pneumatic diaphragms or air cylinders the matching flame-proof type electric-gas valve positioner shall be provided together with the valve.
执行机构采用气动薄膜或气缸执行机构的，随阀提供配套隔爆型电？气阀门定位器。
2
Air inlet throttle valve with pneumatic actuator and positioner.
空气进气节流调节阀：带有气动定位和执行机构。
3
Air bypass valve with pneumatic actuator and positioner.